Example tutorials on multimedia functions using Android SUPPORT LIBRARY Media Compat
Example tutorials on multimedia functions using Android SUPPORT LIBRARY Media Compat
Android support library Media Compat is a component in Android Support Library. It can help developers handle multimedia -related functions through unified interfaces on different versions of Android devices, such as playing audio or video and other operations.This tutorial will introduce how to use Android Support Library Media Compat to extend the multimedia function and provide examples of Java code.
1. Add dependencies
First, add the following dependencies to the project's Build. Gradle file:
implementation 'com.android.support:support-media-compat:<version>'
Make sure the `version>` is replaced with the Media Compat version number you use.
2. Create a media controller class
The first step to expand the multimedia function with Media Compat is to create a media controller class.This class will implement the MediaSessionCompat.Callback interface, and handle related callback methods, such as playback, pause and stop operation.The following is a simple example:
public class MediaController extends MediaSessionCompat.Callback {
public void onPlay() {
// Processing playback operation
}
public void onPause() {
// Processing pause operation
}
public void onStop() {
// Treatment stop operation
}
// Other adjustment methods ...
}
In this example, we only deal with play, pause and stop operation, and you can add more callback methods according to actual needs.
3. Initialize media sessions
In your activity or service, you need to initialize a MediaSessionCompat object and connect it to the media controller.The following code shows how to complete these operations:
public class MainActivity extends AppCompatActivity {
private MediaSessionCompat mediaSessionCompat;
private MediaController mediaController;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize media sessions
mediaSessionCompat = new MediaSessionCompat(this, "MediaSession");
mediaController = new MediaController();
mediaSessionCompat.setCallback(mediaController);
// Start media sessions
mediaSessionCompat.setActive(true);
}
// Other activities of life cycle ...
}
In this example, we initialized media sessions in the onCreate () method and set up media controllers as callback objects.Then we started media sessions.
4. Processing media control
Where you need to handle media control, such as a user click on the play button, you can trigger the corresponding operation by sending the media button event.The following code shows how to send the media button event:
public void onPlayButtonClicked(View view) {
KeyEvent event = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY);
mediaSessionCompat.dispatchMediaButtonEvent(event);
}
In this example, when we click on the play button, we create a Keyevent that represents the media playback button, and sends it to the media to seize it through the DispatchMediabutTonevent () method.
Through the above steps, you can use Android Support Library Media Compat to extend the multimedia function.You can customize the media control class according to actual needs, handle various media operations, and control media sessions by sending appropriate media buttons events.
Hope this tutorial will help you!
