如何在通知栏上放置媒体控制器按钮？

Question

我正在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时在通知栏上显示媒体控制器.它看起来像谷歌播放器.

这该怎么做？

Answer 1

以上是上面针对新API正确完成的示例

在您的主体中,当您想要启动通知时实例化该类:

NotificationPanel nPanel = new NotificationPanel(MyActivity);

当你想取消通知时:(因为这是一个onGoing通知)

nPanel.notificationCancel();    

然后为通知调用者创建类:

public class NotificationPanel {

private Context parent;
private NotificationManager nManager;
private NotificationCompat.Builder nBuilder;
private RemoteViews remoteView;

public NotificationPanel(Context parent) {
    // TODO Auto-generated constructor stub
    this.parent = parent;
    nBuilder = new NotificationCompat.Builder(parent)
    .setContentTitle("Parking Meter")
    .setSmallIcon(R.drawable.ic_launcher)
    .setOngoing(true);

    remoteView = new RemoteViews(parent.getPackageName(), R.layout.notificationview);

    //set the button listeners
    setListeners(remoteView);
    nBuilder.setContent(remoteView);

    nManager = (NotificationManager) parent.getSystemService(Context.NOTIFICATION_SERVICE);
    nManager.notify(2, nBuilder.build());
}

public void setListeners(RemoteViews view){
    //listener 1
    Intent volume = new Intent(parent,NotificationReturnSlot.class);
    volume.putExtra("DO", "volume");
    PendingIntent btn1 = PendingIntent.getActivity(parent, 0, volume, 0);
    view.setOnClickPendingIntent(R.id.btn1, btn1);

    //listener 2
    Intent stop = new Intent(parent, NotificationReturnSlot.class);
    stop.putExtra("DO", "stop");
    PendingIntent btn2 = PendingIntent.getActivity(parent, 1, stop, 0);
    view.setOnClickPendingIntent(R.id.btn2, btn2);
}

public void notificationCancel() {
    nManager.cancel(2);
}
}    

然后添加接受挂起意图的返回类:

public class NotificationReturnSlot extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    String action = (String) getIntent().getExtras().get("DO");
    if (action.equals("volume")) {
        Log.i("NotificationReturnSlot", "volume");
        //Your code
     } else if (action.equals("stopNotification")) {
         //Your code
        Log.i("NotificationReturnSlot", "stopNotification");
     }
     finish();
    }
}

然后,您需要为按钮创建XML文件.这很简单:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >

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

<Button
    android:id="@+id/btn2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    android:text="Stop" />

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

最后也是最不重要的,清单文件:

   <activity android:name=".NotificationReturnSlot"
        android:launchMode="singleTask"
        android:taskAffinity=""
        android:excludeFromRecents="true"/>

Answer 2

要在您的应用中获取媒体播放器控制器,只需按照:

在MainActivity中调用此方法

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);
}

}

创建一个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();
}
}

Notificationlayout.xml的XML布局

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<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"/>

</RelativeLayout>