为所有活动加载一次声音

Question

我试图使用soundpool在我的android应用程序中播放声音。我有3个活动，我必须播放声音。所以我可以加载声音全局一次只有当应用程序启动??

Answer 1

你可以试试这个例子

//start service
Intent svc=new Intent(this, BackgroundSoundService.class);
startService(svc);
//Add in manifest file
<service
    android:enabled="true"
    android:name="com.package.name.BackgroundSoundService" />
public class BackgroundSoundService extends Service {
    private static final String TAG = null;
    MediaPlayer player;
    public IBinder onBind(Intent arg0) {
        return null;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        player = MediaPlayer.create(this, R.raw.idil);
        player.setLooping(true); // Set looping
        player.setVolume(100,100);
    }
    public int onStartCommand(Intent intent, int flags, int startId) {
        player.start();
        return 1;
    }
    public void onStart(Intent intent, int startId) {
        // TO DO
    }
    public IBinder onUnBind(Intent arg0) {
        // TO DO Auto-generated method
        return null;
    }
    public void onStop() {
    }
    public void onPause() {
    }
    @Override
    public void onDestroy() {
        player.stop();
        player.release();
    }
    @Override
    public void onLowMemory() {
    }
}

Answer 2

是的，你可以在全局类中加载音频。谢天谢地，android为我们提供了这样一个类Application.java。

public class TestApp extends Application {
    private static final String TAG = "TestApp";
    private static TestApp sTestApp;
    private MediaPlayer mMediaPlayer;
    @Override
    public void onCreate() {
        super.onCreate();
        sTestApp = this;
        mMediaPlayer = MediaPlayer.create(this, R.raw.music);
        mMediaPlayer.setVolume(1, 1); //Volume should have to be between 0.0 to 1.0
    }
    public static TestApp getInstance() {
        return sTestApp;
    }
    public void play() {
        mMediaPlayer.start();
    }
}

然后在清单

中将其声明为应用程序类

<application
        android:name=".TestApp"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
        .........
</application>

现在这个类将在你的应用程序启动时自动启动，并在你的应用程序完全销毁后销毁。

现在你可以通过调用

来播放音频

TestApp.getInstance().play();