Android in Practice

José Manuel Ortega

Techfest uc3m February 2014

Index

DEVELOPMENT ENVIRONMENT / SDK / TOOLS / ADB

UI DESIGN /ANDROID ASSET STUDIO

GOOGLE PLAY SERVICES / GOOGLE MAPS V2 / MAP FRAGMENTS

ACTION BAR / SEARCH VIEW / NOTIFICATIONS / ACCESSIBILITY / CONTEXTUAL MENU

WEBVIEW / NETWORK CONNECTIONS / ASYNCTASK

SINGLETON / ADAPTER PATTERN / VIEW HOLDER PATTERN

FRAGMENTS / MASTER-DETAIL / DIALOG FRAGMENTS

NAVIGATION DRAWER / ACTION BAR DRAWER TOOGLE /TABS

ACTION SHARE / CONTACTS / LOADERS

HTTP REQUEST /VOLLEY / INSTAGRAM API

GEOLOCATION / SHARED PREFERENCES / SQLITE DATABASE

LIBRARIES

Development environment

JAVA JDK+ANDROID SDK

http://www.oracle.com/technetwork/es/java/javasebusiness/downlo

ads/index.html

http://developer.android.com/sdk/index.html

https://developer.android.com/intl/es/reference/android/app/package-summary.html

Android SDK Starter Package

Development process

Tools

Tools directory

http://developer.android.com/tools/help/index.html

Support libraries and compatibility In recent updates of Eclipse and the Android SDK android-support-V4.jar is added by default in the libs folder when new project is created http://developer.android.com/tools/support-library/index.html Adb commands Process for communicating the device(real or emulated) with

hardware development

adb devices adb install aplicación.apk –r[update] adb uninstall aplicación.apk –k[dont clean application/cache data]

Project

Spain Computing University

UI Design

http://developer.android.com/design/index.html

Ways to specify the size of an item:

dp/dip: Density independent pixel.

sp/sip: Scale independent pixel. Used in font sizes.

pt: Point.

px: Pixel. Not use

Ancho y alto

match_parent:takes all the space available.

wrap_content: uses the space needed

fill_parent:equivalent to match_parent

Android Asset Studio

Generate icons and graphic elements for each resolution http://android-ui-utils.googlecode.com/hg/asset-studio/dist/index.html

Android manifest.xml

Define the components and application permissions <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /> <!-- Permisos --> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <application android:allowBackup="true" android:icon="@drawable/icon" android:label="@string/app_name" android:theme="@style/Theme.Styled" android:configChanges="locale|keyboard|keyboardHidden|orientation" android:name="com.proyecto.spaincomputing.singleton.MySingleton" android:hardwareAccelerated="true" > <activity android:name="com.proyecto.spaincomputing.SplashScreenActivity« android:label="@string/app_name" android:theme="@style/TransparentTheme" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".ListadoActivity" android:configChanges="locale|keyboard|keyboardHidden|orientation" android:hardwareAccelerated="true"/> </application>

http://developer.android.com/reference/android/Manifest.permission.html

Resources /Screen support

External elements you want to include and reference in the application. Declaratively include in /res ,accesing by @<type>/<nname> Are programmatically accessible via the R class (compiled with Android Asset Packaging Tool)

Android automatically selects the resource that adapts to the environment

Each resource type in a folder / res.

drawable: Images, Icons. layout: Layout to organize views. values: string.xml: Text strings colors.xml dimens.xml: font sizes anim: Animations raw: Other resources like audio or video menu: Menus and dialogs xml: Other xml (preferences, app widget, …)

<supports-screens android:anyDensity="true" android:xlargeScreens="true" android:largeScreens="true" android:normalScreens="true" android:smallScreens="true" />

Google play services

Google play services

Check if the service is available

import com.google.android.gms.common.GooglePlayServicesUtil; int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable (getApplicationContext()); Can return the constants: ConnectionResult.SUCCESS: ConnectionResult.DEVELOPER_ERROR: ConnectionResult.INTERNAL_ERROR: ConnectionResult.INVALID_ACCOUNT: ConnectionResult.NETWORK_ERROR: ConnectionResult.RESOLUTION_REQUIRED: ConnectionResult.SERVICE_DISABLED: ConnectionResult.SERVICE_INVALID: ConnectionResult.SERVICE_MISSING: ConnectionResult.SERVICE_VERSION_UPDATE_REQUIRED: ConnectionResult.SIGN_IN_REQUIRED:

OPENGL 2.0 SUPPORT

Google Maps Android API v2 only supports devices with OpenGL ES 2.0 and above.

Check if the system supports OpenGL ES 2.0

final ActivityManager activityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE); final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo(); final boolean supportsEs2 = configurationInfo.reqGlEsVersion >= 0x20000;

GoogleMaps v2

The maps are integrated into Google services play Obtain key

https://developers.google.com/maps/documentation/android/start#the_goo

gle_maps_api_key

Get signed certificate using the keytool command Google APIS Console https://code.google.com/apis/console/ Google CLOUD Console

https://cloud.google.com/console

keytool -list -v -keystore "%USERPROFILE%/.android/debug.keystore"

GoogleMaps v2

Windowpreferencesandroidbuild

GoogleMaps v2

Permissions /Features Google Mapsv2 <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <!-- Localizacion --> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

<uses-feature android:glEsVersion="0x00020000" android:required="true"/>

<permission android:name="com.proyecto.spaincomputing.permission.MAPS_RECEIVE" android:protectionLevel="signature"/> <uses-permission android:name="com.proyecto.spaincomputing.permission.MAPS_RECEIVE"/>

<meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="YOUR_API_KEY"/>

<meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />

Map fragments

layout/fragment_mapa.xml <fragment android:id="@+id/map" android:layout_width="match_parent" android:layout_height="match_parent" class="com.google.android.gms.maps.SupportMapFragment"/>

MapaActivity. FragmentActivity from android.support.v4 import android.support.v4.app.FragmentActivity; public class MapaActivity extends FragmentActivity{ private GoogleMap mapa=null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_mapa); mapa = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)) .getMap();

}}

Markers/InfoWindow

public class MapaActivity extends FragmentActivity implements OnMapLongClickListener, InfoWindowAdapter{ @Override public void onMapLongClick(LatLng location) { MarkerOptions options = new MarkerOptions() .position(location) //location mandatory .title(title) .snippet(snippet); Marker marker = mapa.addMarker(options); } @Override public View getInfoContents(Marker marker) { View window = ((LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE).inflate(R.layout.info_window, null); txt_title.setText(marker.getTitle()); txt_snippet.setText(marker.getSnippet()); return window; }

}

Markers/InfoWindow

OPENGL / DISTANCE POLYGON

Action Bar

ActionBArSherlock.

It is an extension of functionality implemented in the support library

http://actionbarsherlock.com/

ActionBarCompat

Create a new project with API 18 and add the project in the folder

sdk\extras\android\support\v7\appcompat.

Action Bar search view

Action Bar search view

Implement interface OnQueryTextListener

Override methods onQueryTextSubmit, onQueryTextChange

@Override public boolean onQueryTextSubmit(String query) { UniversityListFragment fragmentList = (UniversityListFragment)getSupportFragmentManager().findFragmentByTag("list_fragment"); fragmentList.searchData(query); return true; } @Override public boolean onQueryTextChange(String query) { return true; }

Action Bar search view

@Override public boolean onCreateOptionsMenu(Menu menu) { mSearchView = (SearchView) searchItem.getActionView(); mSearchView.setQueryHint("Search..."); mSearchView.setOnQueryTextListener(this); return true; }

<item android:id="@+id/action_search" android:showAsAction="always" android:title="@string/search" android:icon="@android:drawable/ic_menu_search" android:actionViewClass= "android.support.v7.widget.SearchView" />

private SearchView mSearchView;

ACTION BAR

Icon to go back in Action Bar

ActionBar ab = getSupportActionBar(); ab.setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE |ActionBar.DISPLAY_SHOW_HOME|ActionBar.DISPLAY_HOME_AS_UP);

@Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: this.finish(); break; } return super.onOptionsItemSelected(item); }

Action Bar in fragments

setHasOptionsMenu(true)

onCreateOptionsMenu: to inflate the menu provided by the fragment.

onOptionsItemSelected: to respond to the user touch in an item provided by the fragment menu.

ACTION BAR PROGRESS

Progress bar in Action Bar

private Activity activity = this; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.getWindow().requestFeature(Window.FEATURE_INDETERMINATE_PROGRESS); ActionBar ab = getSupportActionBar(); ……… }

activity.setProgressBarIndeterminateVisibility(true);

viewer.setWebViewClient(new WebViewClient() {

public void onPageFinished(WebView view, String url) {

activity.setProgressBarIndeterminateVisibility(false);

}

Show the progress bar to start loading and hide when finished.

Notifications

To generate notifications in the status bar of the system we use a class included in library compatibility android-support-v4.jar.

The class is NotificationCompat.Builder and we have to create a new object passing by parameter application context and assign all the properties you want through their set () methods.

import android.support.v4.app.NotificationCompat; import android.support.v4.app.TaskStackBuilder;

NotificationCompat.Builder myNotification = new NotificationCompat.Builder(context) .setContentTitle(titulo) .setContentText(texto) .setTicker(aviso) .setWhen(System.currentTimeMillis()) .setContentIntent(contentIntent) .setDefaults(Notification.DEFAULT_SOUND) .setAutoCancel(true) .setSmallIcon(R.drawable.favorito) .setLargeIcon(largeIcon);

Notifications Create and launch notification via object NotificationManager

TaskStackBuilder stackBuilder=TaskStackBuilder.create(context); stackBuilder.addParentStack(PrincipalActivity.class); stackBuilder.addNextIntent(notificationIntent); PendingIntent resultPendingIntent=stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

Associating action to notification

NotificationManager notificationManager; notificationManager =(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); /*Create notification with builder*/ Notification notification=myNotification.build(); notificationManager.notify((int) System.currentTimeMillis(), notification);

Accessibility

http://developer.android.com/training/accessibility/index.html

<Button android:id="@+id/pause_button" android:src="@drawable/pause" android:contentDescription="@string/pause"/>

Through layout

Through code

String contentDescription = "Select " + strValues[position]; label.setContentDescription(contentDescription);

Contextual menu

Contextual menu

Add menu items by code @Override public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) { if(listado.size()>0){ menu.setHeaderTitle(R.string.accion); if(!favoritos){ menu.add(0, Constants.MENU_FAVORITO, 3, getResources().getText(R.string.anyadir_favorito)); }else{ menu.add(0, Constants.MENU_FAVORITO, 3, getResources().getText(R.string.eliminar_favorito)); } }}

lstListado.setAdapter(new UniversidadAdapter(this)); registerForContextMenu(lstListado); //view register

Floating list at long press on a View row

Contextual menu

Add options menu with xml (recommended option) <?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/mapa" android:title="@string/mapa" android:showAsAction="ifRoom|withText" android:icon="@drawable/location" /> <item android:id="@+id/rutaGoogle" android:title="@string/ruta_google" android:showAsAction="ifRoom|withText" android:icon="@drawable/google_map" /> </menu> @Override public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); MenuInflater inflater=getActivity().getMenuInflater(); if(listado.size()>0){ inflater.inflate(R.menu.menu_mostrar, menu); }}

Contextual menu

//Manage touch in contextual menu @Override public boolean onContextItemSelected(android.view.MenuItem item) { AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); //selected row UniversidadBean ub = (UniversidadBean) getUniversidad((int) info.id); switch (item.getItemId()) { case Constants.MENU_ENLACE: if(ub.getEnlace()!=null){ listener.onUniversidadLink(ub.getEnlace()); } return true; default: return super.onContextItemSelected(item); } }

WebView

WebView

<WebView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/visorWebView"> </WebView>

import android.webkit.WebView; import android.webkit.WebViewClient; WebView viewer; viewer = (WebView) findViewById(R.id.visorWebView); viewer.setWebViewClient(new myWebClient()); viewer.getSettings().setJavaScriptEnabled(true); viewer.getSettings().setBuiltInZoomControls(true); viewer.loadUrl(content);

WebView

public class myWebClient extends WebViewClient{ @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); } @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } @Override public void onPageFinished(WebView view, String url) { super.onPageFinished(view, url); } }

Network connection

import android.net.ConnectivityManager; import android.net.NetworkInfo; ConnectivityManager connectivityManager; connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); Boolean connected = networkInfo != null && networkInfo.isAvailable() && networkInfo.isConnected();

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

Network connection Enable Wifi / Check connection type

NetworkInfo wifiInfo=connectivityManager.getNetworkInfo (ConnectivityManager.TYPE_WIFI); NetworkInfo mobileInfo=connectivityManager.getNetworkInfo (ConnectivityManager.TYPE_MOBILE); if(wifiInfo.isConnected()){ Toast.makeText(context, "Wifi is connected", Toast.LENGTH_LONG).show(); } if(mobileInfo.isConnected()){ Toast.makeText(context, "3G/4G is connected", Toast.LENGTH_LONG).show(); }

WifiManager wifiManager=(WifiManager) context.getSystemService(Context.WIFI_SERVICE); wifiManager.setWifiEnabled(true);

<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

Asynctask This class will allow us to perform background tasks without using neither

directly nor Handlers Threads, trying these elements in a fully transparent way to the programmer.

When we define a AsyncTask class must define the type of three elements, the input parameters, its progress and outcome.

Override onPreExecute(),doInBackground(),onPostExecute(),onProgressUpdate()

class RequestTask extends AsyncTask<String, String, String>{ @Override protected void onPreExecute() { } @Override protected void onProgressUpdate(Integer... values) { } @Override protected String doInBackground(String... uri) { } @Override protected void onPostExecute(String result) { super.onPostExecute(result); }

new RequestTask(). execute(url);

Asynctask onPreExecute, run before executing our task and we can use it to initialize

tasks as displaying a progress bar.

doInBackground(Params...), here we schedule our background task. Params in the case discussed earlier will be an array of Strings that are passed when calling the execute method. Being a process that can take an indefinite time to complete, we can give feedback to the user thanks to percent complete in publishProgress(Progress. ..) method.

publishProgress receives an integer parameter and make the execution of onProgressUpdate method to indicate the user the task percentage.

onPostExecute(Result), runs to finish the process in the background.

The problem of doInBackground method is blocking the UI, so while this method is running can not get anything in the ui, but if we have no choice ,we can use this code for debug.

runOnUiThread(new Runnable() { public void run() { Toast.makeText(getApplicationContext(), "Example for Toast",Toast.LENGTH_SHORT).show();} });

Singleton

Only one instance Application class

<application android:allowBackup="true" android:icon="@drawable/icon" android:label="@string/app_name" android:theme="@style/Theme.Styled" android:name= "com.proyecto.spaincomputing.singleton.MySingleton">

public class MySingleton extends Application { private static MySingleton instance; public static Context context; @Override public void onCreate() { super.onCreate(); context = getApplicationContext(); } }

Navigation Pattern

import android.support.v4.app.NavUtils; NavUtils.navigateUpTo(this, new Intent(this, ListadoActivity.class));

http://developer.android.com/design/patterns/navigation.html

Intent intent = NavUtils.getParentActivityIntent(this); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP| Intent.FLAG_ACTIVITY_SINGLE_TOP); NavUtils.navigateUpTo(this, intent);

NavUtils.navigateUpFromSameTask(this);

<activity android:name=".DetalleUniversidadActivity" android:parentActivityName=".ListadoActivity" <!-- Parent activity meta-data to support 4.0 and lower --> <meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".ListadoActivity" /> </activity>

Adapter Pattern

Link between the source data and the view It works with ListView or GridView There are many types of adapter You can perform a custom adaptar The most used ArrayAdapter / CursorAdapter The Adapter interacts with a collection of data objects for display in

View

ArrayList<UniversidadBean> listado=newArrayList<UniversidadBean>(); private ListView lstListado; lstListado=(ListView)getView().findViewById (R.id.LstListado); lstListado.setAdapter (new UniversidadAdapter(this,listado));

View Holder/View Container Pattern

ViewContainer

static class ViewContainer{

public ImageView imagen;

public TextView nombre;

public TextView descripcion;

}

Improve the performance of listview

The viewholder is used to avoid calling findViewById whenever prompted a new row to the adapter. Thus, instead of calling findViewById each time you use the references to the fields you have stored in the viewholder.

This pattern will help us to limit the number of calls to findViewById method. The idea would be to call it once, and then save the view daughter that refers to the instance of ViewHolder to be associated with the object by the method convertView View.setTag ()

Its recommend using a static class to store the items of each row in the view, functioning as a kind of cache for our view.

View Holder/View Container Pattern @Override

public View getView(int position, View convertView,ViewGroup parent) {

ViewContainer viewContainer;

//si es la primera vez que se imprime la fila

if(convertView==null){

LayoutInflater inflater = context.getLayoutInflater();

convertView = inflater.inflate(R.layout.row, null,true);

//crea una vista para el objeto contenedor

viewContainer=new ViewContainer()

//obtiene una referencia a todas las vistas de la fila

viewContainer.nombre=(TextView)convertView.findViewById(R.id.textView_superior);

viewContainer.descripcion=(TextView)convertView.findViewById(R.id.textView_inferior);

viewContainer.imagen=(ImageView)convertView.findViewById(R.id.imageView_imagen);

//asigna el contenedor de la vista a rowView

convertView.setTag(viewContainer);

}else{

viewContainer=(ViewContainer) convertView.getTag(); //recicling }

//personaliza el contenido de cada fila basándone en su posición

viewContainer.nombre.setText(listado.get(position).getNombre());

viewContainer.descripcion.setText(listado.get(position).getDescripcion());

viewContainer.imagen.setImageResource(listado.get(position).getIdImagen());

return(convertView);

}

View Holder/View Container Pattern

Debug

Fragments

A fragment represents a certain behavior or a portion of a user interface activity.

Multiple fragments can be combined. A fragment must always be part of an activity. They emerged to provide greater flexibility to build the user interface Override methods

@Override //called when finish onCreate method in activity public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); } @Override public void onCreate(Bundle savedInstanceState) {//inicializar componentes super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle

savedInstanceState) { }

http://developer.android.com/guide/components/fragments.html

Fragments

Add a fragment to view by layout xml <?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal">

<fragment

class="com.proyecto.spaincomputing.fragment.UniversidadesFragment"

android:id="@+id/FrgListado"

android:layout_width="375dp"

android:layout_height="match_parent"/>

<fragment

class="com.proyecto.spaincomputing.fragment.FragmentDetalle"

android:id="@+id/FrgDetalle"

android:layout_width="match_parent"

android:layout_height="match_parent"/>

</LinearLayout>

Fragments

Add a fragment to view

By code //Fragments array Fragment[] fragments = new Fragment[]{new PortadaFragment(), new UniversityListFragment(),new UniversidadesImagesFragment()}; FragmentManager manager = getSupportFragmentManager(); manager.beginTransaction() .add(R.id.contentFrame, fragments[0]) .add(R.id.contentFrame, fragments[1]) .add(R.id.contentFrame, fragments[2]) .commit(); //show/hide manager.beginTransaction().show(fragments[0]).commit(); manager.beginTransaction().hide(fragments[1]).commit(); manager.beginTransaction().hide(fragments[2]).commit();

Fragments/ Master-detail

PORTRAIT LANDSCAPE

Fragments/ Master-detail

PORTRAIT

LANDSCAPE

Fragments/ Master-detail

2 layout layout\fragment_universidades_list.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout>

Fragments/ Master-detail

2 layout layout-land\fragment_universidades_list.xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:baselineAligned="false" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="horizontal" tools:context=".TabsActivity" > <ListView android:id="@+id/listView" android:layout_width="0px" android:layout_height="wrap_content" android:layout_weight="1.5"> </ListView> <fragment android:id="@+id/fragmentUniversidadInfo" android:name="com.proyecto.spaincomputing.fragment.UniversidadInfoFragment" android:layout_width="0px" android:layout_height="wrap_content" android:layout_weight="4" tools:layout="@layout/fragment_universidad_info" /> </LinearLayout>

Fragments/ Master-detail

Check orientation to display the detail page UniversidadBean ub=listado.get(position); if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) { FragmentManager manager = getActivity().getSupportFragmentManager(); UniversidadInfoFragment fragment = (UniversidadInfoFragment) manager.findFragmentById(R.id.fragmentUniversidadInfo); fragment.loadWebViewContent(ub.getEnlace()); getActivity().invalidateOptionsMenu(); } else { Intent intent = new Intent(getActivity().getApplicationContext(), UniversityDetailActivity.class); intent.putExtra(UniversityDetailActivity.URL, ub.getEnlace()); url=ub.getEnlace(); intent.putExtra(UniversityDetailActivity.UNIVERSIDAD, ub.getNombre()); startActivity(intent); }

Dialog Fragment

The DialogFragment class provides all the controls you need to create a dialogue and change its appearance. It was introduced in Android 3.0 (API 11) and is available in the support library, so that it can be used without problems with older versions.

Use the class you DialogFragment ensures proper management of events that may occur, such as clicking the Back button or rotate the screen. Furthermore, using this class we can reuse the interface dialogues as a larger component interface.

To create a dialogue create a class that inherits from the DialogFragment class and create an AlertDialog object in the onCreateDialog() method

import android.support.v4.app.DialogFragment; public class LinkDialogFragment extends DialogFragment { @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setTitle(getText(R.string.title).toString()); .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { listener.onDialogNegativeClick(LinkDialogFragment.this); } }); return builder.create(); }}

Dialog Fragment

To display the dialog we just created we have to create an instance of the class in our business and invoke the show () method so that the dialog appears.

With getSupportFragmentManager() call method get access to FragmentManager that is responsible for managing the fragments of the application.

//LinkDialogFragment object LinkDialogFragment linkDialogFragment=new LinkDialogFragment(); //fragment parameters Bundle args = new Bundle(); args.putString("ENLACE", enlace); linkDialogFragment.setArguments(args); linkDialogFragment.show(getSupportFragmentManager(), "");

Navigation Drawer

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout

xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/drawerLayout"> <!-- The main content view --> <FrameLayout android:id="@+id/contentFrame" android:layout_width="match_parent" android:layout_height="match_parent" /> <!-- The navigation drawer --> <ListView android:id="@+id/left_drawer" android:layout_width="240dp" android:layout_height="match_parent" android:layout_gravity="start" android:choiceMode="singleChoice" android:divider="@android:color/transparent" android:dividerHeight="0dp" android:background="#111"/> </android.support.v4.widget.DrawerLayout>

http://developer.android.com/training/implementing-navigation/nav-drawer.html

Navigation Drawer

private ListView drawerList; private String[] drawerOptions; private DrawerLayout drawerLayout; drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); drawerList = (ListView) findViewById(R.id.left_drawer); drawerOptions = getResources().getStringArray(R.array.drawer_options); // Set the adapter for the list view drawerList.setAdapter(new ArrayAdapter<String>(getApplicationContext(), R.layout.drawer_list_item,drawerOptions)); // Set the list's click listener drawerList.setOnItemClickListener(new DrawerItemClickListener()); private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position,long id)

{ setContent(position); } }

Navigation Drawer/ ActionBarDrawerToogle

private ActionBarDrawerToggle drawerToggle; drawerToggle = new ActionBarDrawerToggle( this, drawerLayout, R.drawable.ic_drawer, R.string.drawer_open, //accesibility text string R.string.drawer_close ) { public void onDrawerClosed(View view) { ActivityCompat.invalidateOptionsMenu(PrincipalActivity.this); } public void onDrawerOpened(View drawerView) { ActivityCompat.invalidateOptionsMenu(PrincipalActivity.this); } } //listener drawerLayout.setDrawerListener(drawerToggle); drawerToggle.setDrawerIndicatorEnabled(true);

Open/close sidebar by Icon ActionBar Through ActionBarDrawerToogle object in support library

Navigation Drawer/ ActionBarDrawerToogle

getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setHomeButtonEnabled(true); @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); drawerToggle.onConfigurationChanged(newConfig); } @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); drawerToggle.syncState(); //sincronize drawer toogle state } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { if (drawerLayout.isDrawerOpen(drawerList)) { drawerLayout.closeDrawer(drawerList); } else { drawerLayout.openDrawer(drawerList); } return true; } }

We allow the use of the icon in Action Bar

Tabs

Tabs Implement interface TabListener

Override methods in TabListener

@Override public void onTabUnselected(Tab arg0, FragmentTransaction arg1) { } @Override public void onTabReselected(Tab tab, FragmentTransaction ft) { } @Override public void onTabSelected(Tab tab, FragmentTransaction ft) { setContent(tab.getPosition()); }

import com.actionbarsherlock.app.ActionBar.Tab; import com.actionbarsherlock.app.ActionBar.TabListener; public class TabsActivity extends SherlockFragmentActivity implements TabListener { }

Tabs Reference obtain ActionBar

final ActionBar actionBar = getSupportActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

Add tabs

actionBar.addTab( actionBar.newTab() .setText(getResources().getString(R.string.listado)) .setTabListener(this)); actionBar.addTab( actionBar.newTab() .setText(getResources().getString(R.string.imagenes)) .setTabListener(this));

Action Share / Share Action Provider

Action Share Launch an intent of type "ACTION_SEND" to be received by the applications you have installed public void mostrarShare(UniversidadBean ubBean){ List<Intent> targetedShareIntents = new ArrayList<Intent>(); Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND); shareIntent.setType("text/html"); List<ResolveInfo> resInfo = getActivity().getPackageManager().queryIntentActivities(shareIntent, 0); if (!resInfo.isEmpty()){ for (ResolveInfo resolveInfo : resInfo) { String packageName = resolveInfo.activityInfo.packageName; Intent targetedShareIntent = new Intent(android.content.Intent.ACTION_SEND); targetedShareIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); targetedShareIntent.setType("text/html"); targetedShareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Spain COmputing UNiversity"); targetedShareIntent.setPackage(packageName); targetedShareIntents.add(targetedShareIntent); } Intent chooserIntent = Intent.createChooser(targetedShareIntents.remove(targetedShareIntents.size()-1), getText(R.string.compartir)); chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetedShareIntents.toArray(new Parcelable[]{})); startActivity(chooserIntent); } }

Share Action Provider

<item android:id="@+id/action_share" android:title="@string/compartir" spaincomputing:showAsAction="ifRoom" spaincomputing:actionProviderClass= "android.support.v7.widget.ShareActionProvider"/>

private Intent createShareIntent() { Intent shareIntent = new Intent(Intent.ACTION_SEND); shareIntent.setType("text/html"); shareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Spain COmputing UNiversity"); UniversidadBean ub=new UniversidadBean(id, idImagen, nombre, descripcion, enlace, tipo, grado, latitud, longitud); shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, Html.fromHtml(ub.getNombre()+"\n"+ub.getDescripcion()+"\n"+ub.getGrado()+"\n\n"+ub.getEnlace()+"\n\n"+ub.getLatitud()+"\n"+ub.getLongitud())); return shareIntent; }

private ShareActionProvider mShareActionProvider; MenuItem shareItem = menu.findItem(R.id.action_share); mShareActionProvider = (ShareActionProvider)MenuItemCompat.getActionProvider(shareItem); mShareActionProvider.setShareIntent(createShareIntent());

Contacts

import android.provider.ContactsContract; //CONTACTS PROVIDER Cursor mCursor; // acceder al content provider de contactos mCursor = getContentResolver().query(Data.CONTENT_URI, new String[] { Data._ID, Data.DISPLAY_NAME, Email.DATA1, Phone.TYPE }, Data.MIMETYPE + "='" + Email.CONTENT_ITEM_TYPE + "' AND " + Email.DATA1 + " IS NOT NULL", null,Data.DISPLAY_NAME + " ASC"); ListAdapter adapter = new SimpleCursorAdapter(this, // context android.R.layout.simple_list_item_2, // Layout para las filas mCursor, // cursor new String[] { Data.DISPLAY_NAME, Phone.NUMBER }, //COLUMNS new int[] { android.R.id.text1, android.R.id.text2 }, //views ); setListAdapter(adapter);

<uses-permission android:name="android.permission.READ_CONTACTS" />

android.os.Build.VERSION.SDK_INT<11 //before honeycomb

Contacts

CursorLoader cursorLoader=new CursorLoader(this, Data.CONTENT_URI, new String[] { Data._ID, Data.DISPLAY_NAME, Email.DATA1,Phone.TYPE }, Data.MIMETYPE + "='" + Email.CONTENT_ITEM_TYPE + "' AND "+ Email.DATA1 + " IS NOT NULL", null,Data.DISPLAY_NAME + " ASC"); mCursor=cursorLoader.loadInBackground(); ListAdapter adapter = new SimpleCursorAdapter(this, // context android.R.layout.simple_list_item_2, // Layout para las filas mCursor, // cursor new String[] { Data.DISPLAY_NAME, Phone.NUMBER }, //COLUMNS new int[] { android.R.id.text1, android.R.id.text2 }, //views CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER); //flag ); setListAdapter(adapter);

android.os.Build.VERSION.SDK_INT>=11 //after honeycomb

Using CursorLoader allows the query cursor executing on a separate thread

Loaders in contacts public class ContactsListFragment implements LoaderManager.LoaderCallbacks<Cursor> { }

@Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getLoaderManager().initLoader(ContactsQuery.QUERY_ID, null, this);}}

Inicializar loader

@Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { return new CursorLoader(getActivity(),contentUri,ContactsQuery.PROJECTION, ContactsQuery.SELECTION,null,ContactsQuery.SORT_ORDER);} }

@Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { // This swaps the new cursor into the adapter. if (loader.getId() == ContactsQuery.QUERY_ID) { mAdapter.swapCursor(data); } } @Override public void onLoaderReset(Loader<Cursor> loader) {}

HTTP Request org.apache.http

// Create HTTP Client HttpParams httpParameters = new BasicHttpParams(); // 3s max for connection HttpConnectionParams.setConnectionTimeout (httpParameters,3000); // 4s max to get data HttpConnectionParams.setSoTimeout(httpParameters, 4000); HttpClient httpclient = new DefaultHttpClient(httpParameters); HttpResponse response; String responseString = null; try {response = httpclient.execute(new HttpGet(uri[0]));//Execute uri StatusLine statusLine = response.getStatusLine(); if(statusLine.getStatusCode() == HttpStatus.SC_OK){ ByteArrayOutputStream out = new ByteArrayOutputStream(); response.getEntity().writeTo(out); out.close(); responseString = out.toString(); } else{ //Closes the connection. response.getEntity().getContent().close(); throw new IOException(statusLine.getReasonPhrase()); }} catch (ClientProtocolException e) {//TODO Handle problems.. } catch (IOException e) {//TODO Handle problems..}

API INSTAGRAM

.Developer register

New client register

http://instagram.com/developer/clients/manage/

http://instagram.com/developer/

API INSTAGRAM

API INSTAGRAM

Endpoint tag media recent http://instagram.com/developer/endpoints/tags/#get_tags_media_recent

VOLLEY

https://android.googlesource.com/platform/frameworks/volley https://github.com/mcxiaoke/android-volley

Unzip and import from Eclipse as a new project with code available. Export the project as Java Volley / jar checking only the "src" folder.

Volley is a library that facilitates and speeds up the creation of applications

that make use of networking in Android handling concurrency and network requests.

The advantage is that volley is responsible for managing the request threads

transparently to the developer.

libs\volley.jar Objects RequestQueue

Request: Contains all the necessary details of API calls to Web. For example,

the method to use (GET or POST), application data, listeners, error listeners.

VOLLEY REQUEST

import com.android.volley.*; public static RequestQueue requestQueue; @Override protected void onCreate(Bundle savedInstanceState) { requestQueue = Volley.newRequestQueue(this); }

JSON Request with volley.Request object

JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.GET, url, null, successListener,null); requestQueue.add(jsObjRequest);

Instagram Activity

VOLLEY RESPONSE

//Callback that is executed once the request has completed Response.Listener<JSONObject> successListener = new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { } }

JSON Response by volley.Response object

More volley examples https://github.com/PareshMayani/Android-Volley-Example

Geolocation

LocationManager / android.location package ACCESS_COARSE_LOCATION/ACCESS_FINE_LOCATION

//Obtenemos el Location Manager del sistema LocationManager locationManager = (LocationManager)this.getSystemService (Context.LOCATION_SERVICE); // Definimos el Listener que gestionará los eventos LocationListener locationListener = new LocationListener() { public void onLocationChanged(Location location) { if (location != null) { Toast.makeText(getBaseContext(), "Location changed : Lat: " + location.getLatitude() + " Lng: " + location.getLongitude(),Toast.LENGTH_SHORT).show(); } }

// Registramos el Listener en el Location Manager para recibir actualizaciones locationManager. requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

Geolocation

Implement interface ConnectionCallbacks

import com.google.android.gms.common.GooglePlayServicesClient. ConnectionCallbacks;

Override onConnected / User location

@Override public void onConnected(Bundle arg0) { updateLocation(locationClient.getLastLocation()); locationClient.requestLocationUpdates(locationRequest, this); }

import com.google.android.gms.location.LocationClient; import com.google.android.gms.location.LocationRequest; locationClient = new LocationClient(this, this, this); locationRequest = LocationRequest.create();

Reverse Geolocation

Geocoder geoCoder = new Geocoder(context, Locale.getDefault()); List<Address> addresses = null; try { addresses = geoCoder.getFromLocation(gp.latitude , gp.longitude , 1); if (addresses!=null && addresses.size() > 0) { Address address = addresses.get(0); if(address.getMaxAddressLineIndex() > 0 ){ addressText =address.getAddressLine(0); } if(address.getLocality()!=null){ addressText = addressText+" / "+address.getLocality(); } if(address.getCountryName()!=null){ addressText = addressText+" / "+address.getCountryName(); } } } catch (IOException e) { }

Obtain place address from latidude and longitude

Restore state in activity

@Override public void onSaveInstanceState(Bundle savedInstanceState) { // Always call the superclass so it can save the view hierarchy state super.onSaveInstanceState(savedInstanceState); }

Save the Activity state before being destroyed

Restore the Activity state after being created

public void onRestoreInstanceState(Bundle savedInstanceState) { // Always call the superclass so it can restore the view hierarchy super.onRestoreInstanceState(savedInstanceState); }

SEND EMAIL

SEND EMAIL ACTION_SEND INTENT

Intent intent = new Intent(android.content.Intent.ACTION_SEND); intent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{destino}); //colocamos la imagen adjunta en el stream intent.putExtra(Intent.EXTRA_STREAM, Uri.parse("android.resource://" + getPackageName() + "/" +R.drawable.image)); startActivity(Intent.createChooser(intent, "Send email"));

libs https://code.google.com/p/javamail-android/downloads/list

Java mail API / Gmail SMTP /GMAILSender

Gmail authentication Configure SMTP SERVER

Shared Preferences

Key/value dictionary res/xml/preferencias.xml

<?xml version="1.0" encoding="utf-8"?> <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> <PreferenceCategory android:title="@string/pref_notificaciones"> <CheckBoxPreference android:key="pref_notificaciones_favoritos" android:title="@string/pref_notificaciones_favoritos" android:summary="@string/pref_notificaciones_favoritos" android:defaultValue="true" /> </PreferenceCategory> </PreferenceScreen>

PreferenceScreen is the entire screen that will show us where the other elements are displayed, and PreferenceCategory will allow us to create categories or groupings within our screen. The common element in different items is the key property. This will be the key that is stored in SharedPreferences and later retrieve the stored values by this key.

Shared Preferences

Shared Preferences Preferences Activity

@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) { onCreatePreferenceActivity(); } else { onCreatePreferenceFragment(); } } private void onCreatePreferenceActivity() { PreferenceManager prefManager=getPreferenceManager(); prefManager.setSharedPreferencesName("appPreferences"); addPreferencesFromResource(R.xml.preferencias); } private void onCreatePreferenceFragment() { getFragmentManager().beginTransaction() .replace(android.R.id.content, new MyPreferenceFragment ()) .commit(); }

Shared Preferences

PreferenciasActivity

public static class MyPreferenceFragment extends PreferenceFragment { @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); PreferenceManager prefManager=getPreferenceManager(); prefManager.setSharedPreferencesName("appPreferences"); addPreferencesFromResource(R.xml.preferencias); } }

Get Preferences values SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("appPreferences", MODE_PRIVATE); //Launch favorites notification depending preferences value if(sharedPreferences.getBoolean("pref_notificaciones_favoritos",true)){ com.proyecto.spaincomputing.utils.StatusBarNotify.getInstance( getApplicationContext()).statusBarNotify("eliminado_favorito", nombre,descripcion); }

SQLITE DATABASE

SQLITE DATABASE import android.database.sqlite.*;

Create class that extends SQLiteOpenHelper and override onCreate()

method to create database

public class DBHelper extends SQLiteOpenHelper { //constructor public DBAdapter (Context context){ dbHelper = new DBHelper(context, DATABASE_NAME, null, DATABASE_VERSION); } private final static String DATABASE_CREATE = "CREATE TABLE ..“; @Override public void onCreate(SQLiteDatabase db) { db.execSQL(DATABASE_CREATE); } }

Emulator /root /data/data/<package>/databases

SQLITE DATABASE INSERT,UPDATE,DELETE

SQLiteDatabase db = dbHelper.getWritableDatabase();

QUERY

SQLiteDatabase db = dbHelper.getReadableDatabase(); Cursor cursor= myDatabase.query(DATABASE_TABLE, null, where,null, null, null, order);

// Create a new row of values to insert.

ContentValues newValues = new ContentValues();

// Assign values for each row.

newValues.put(COLUMN_NAME, newValue);

[ ... Repeat for each column ... ]

// Insert

myDatabase.insert(DATABASE_TABLE, null, newValues);

// Update

myDatabase.update(DATABASE_TABLE, updatedValues, where,

null);

// Delete

myDatabase.delete(DATABASE_TABLE, null, null);

Developer libraries in google play

Libraries

Indicator in ViewPager http://viewpagerindicator.com/

https://github.com/chrisbanes/ActionBar-PullToRefresh

Pager Sliding Tabstrip https://github.com/astuetz/PagerSlidingTabStrip Show routes in map. https://github.com/tyczj/MapNavigator

Sliding Menu

Library to implement a sliding flyout with similar behavior to navigation drawer

https://github.com/jfeinstein10/SlidingMenu

MessageBar

Library to improve toast messages http://simonvt.github.io/MessageBar/

Fading Action Bar

Used in Google play music https://github.com/ManuelPeinado/FadingActionBar

+

http://www.androidviews.net/

About me

https://github.com/jmortega/apps https://github.com/jmortega/android

https://www.linkedin.com/in/jmortega1

jmoc25@gmail.com

https://play.google.com/store/apps/developer?id=Jos%C3%A9+Manuel+Ortega+Candel

Google play