我创建一个音乐播放器应用程序。我想在我的应用程序在后台运行，显示在通知栏媒体控制器。它看起来像谷歌的球员。

I am creating a music player application. I want to show the media controller on notification bar while my application is running in background. It looks like Google player.

如何做到这一点？

推荐答案

为了得到媒体播放器在你的应用程序只需按照这样的：

For getting media player controller in your app simply follow this:

调用这个方法在你的MainActivity

public void showNotification(View view){
        new MyNotification(this);
        finish();
    }

创建一个新的MynotificationClass

public class MyNotification extends Notification {

private Context ctx;
private NotificationManager mNotificationManager;

@SuppressLint("NewApi")
public MyNotification(Context ctx){
    super();
    this.ctx=ctx;
    String ns = Context.NOTIFICATION_SERVICE;
    mNotificationManager = (NotificationManager) ctx.getSystemService(ns);
    CharSequence tickerText = "Shortcuts";
    long when = System.currentTimeMillis();
    Notification.Builder builder = new Notification.Builder(ctx);
    @SuppressWarnings("deprecation")
    Notification notification=builder.getNotification();
    notification.when=when;
    notification.tickerText=tickerText;
    notification.icon=R.drawable.ic_launcher;

    RemoteViews contentView=new RemoteViews(ctx.getPackageName(), R.layout.messageview);

    //set the button listeners
    setListeners(contentView);

    notification.contentView = contentView;
    notification.flags |= Notification.FLAG_ONGOING_EVENT;
    CharSequence contentTitle = "From Shortcuts";
    mNotificationManager.notify(548853, notification);
}

public void setListeners(RemoteViews view){
    //radio listener
    Intent radio=new Intent(ctx,HelperActivity.class);
    radio.putExtra("DO", "radio");
    PendingIntent pRadio = PendingIntent.getActivity(ctx, 0, radio, 0);
    view.setOnClickPendingIntent(R.id.radio, pRadio);

    //volume listener
    Intent volume=new Intent(ctx, HelperActivity.class);
    volume.putExtra("DO", "volume");
    PendingIntent pVolume = PendingIntent.getActivity(ctx, 1, volume, 0);
    view.setOnClickPendingIntent(R.id.volume, pVolume);

    //reboot listener
    Intent reboot=new Intent(ctx, HelperActivity.class);
    reboot.putExtra("DO", "reboot");
    PendingIntent pReboot = PendingIntent.getActivity(ctx, 5, reboot, 0);
    view.setOnClickPendingIntent(R.id.reboot, pReboot);

    //top listener
    Intent top=new Intent(ctx, HelperActivity.class);
    top.putExtra("DO", "top");
    PendingIntent pTop = PendingIntent.getActivity(ctx, 3, top, 0);
    view.setOnClickPendingIntent(R.id.top, pTop);*/

    //app listener
    Intent app=new Intent(ctx, com.example.demo.HelperActivity.class);
    app.putExtra("DO", "app");
    PendingIntent pApp = PendingIntent.getActivity(ctx, 4, app, 0);
    view.setOnClickPendingIntent(R.id.btn1, pApp);
}

}

创建HelperActivity类

public class HelperActivity extends Activity {

private HelperActivity ctx;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    ctx = this;
    String action = (String) getIntent().getExtras().get("DO");
    if (action.equals("radio")) {
        //Your code
    } else if (action.equals("volume")) {
        //Your code
    } else if (action.equals("reboot")) {
        //Your code
    } else if (action.equals("top")) {
        //Your code
    } else if (action.equals("app")) {
        //Your code
    }

    if (!action.equals("reboot"))
        finish();
}

@Override
protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
}
}

有关Notificationlayout.xml XML布局

XML layout for Notificationlayout.xml

<?xml version="1.0" encoding="UTF-8"?>

<TextView
    android:id="@+id/msglbl"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="test" />

<TextView
    android:id="@+id/message"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_toRightOf="@+id/msglbl" />

<Button
    android:id="@+id/btn1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="play" android:layout_margin="10dp"/>