锁定屏幕上的媒体控制，如Android中的Google Play音乐？

Question

我已经通过了锁屏小部件文档，我实现了它，但这不是自动放在主锁窗口上的内容。我正在寻找提供Media Lock-screen窗口（在Jelly Bean及以上版本中）的媒体控制解决方案，如Google Play音乐应用程序。

看看谷歌播放音乐锁，这显然不是锁定屏幕小部件。

Answer 1

你检查过RemoteControlClient吗？即使应用程序处于锁定模式，它也用于Android音乐遥控器。（与您附加的图像相同）

请检查RemoteControlClient

只需在接收器命令操作播放，暂停，下一个和上一个乐曲轨道时调用以下方法。

  private void lockScreenControls() {

    // Use the media button APIs (if available) to register ourselves for media button
    // events

    MediaButtonHelper.registerMediaButtonEventReceiverCompat(mAudioManager, mMediaButtonReceiverComponent);
    // Use the remote control APIs (if available) to set the playback state
    if (mRemoteControlClientCompat == null) {
        Intent intent = new Intent(Intent.ACTION_MEDIA_BUTTON);
        intent.setComponent(mMediaButtonReceiverComponent);
        mRemoteControlClientCompat = new RemoteControlClientCompat(PendingIntent.getBroadcast(this /*context*/,0 /*requestCode, ignored*/, intent /*intent*/, 0 /*flags*/));
        RemoteControlHelper.registerRemoteControlClient(mAudioManager,mRemoteControlClientCompat);
    }
    mRemoteControlClientCompat.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING);
    mRemoteControlClientCompat.setTransportControlFlags(
            RemoteControlClient.FLAG_KEY_MEDIA_PAUSE |
            RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS |
            RemoteControlClient.FLAG_KEY_MEDIA_NEXT |
            RemoteControlClient.FLAG_KEY_MEDIA_STOP);

  //update remote controls
    mRemoteControlClientCompat.editMetadata(true)
            .putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, "NombreArtista")
            .putString(MediaMetadataRetriever.METADATA_KEY_ALBUM, "Titulo Album")
            .putString(MediaMetadataRetriever.METADATA_KEY_TITLE, nombreCancion)
            //.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION,playingItem.getDuration())
                    // TODO: fetch real item artwork
            .putBitmap(RemoteControlClientCompat.MetadataEditorCompat.METADATA_KEY_ARTWORK, getAlbumArt())
            .apply();
    }
}

MediaButtonHelper类

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import android.content.ComponentName;
import android.media.AudioManager;
import android.util.Log;

/**
 * Class that assists with handling new media button APIs available in API level 8.
 */
public class MediaButtonHelper {
    // Backwards compatibility code (methods available as of API Level 8)
    private static final String TAG = "MediaButtonHelper";

    static {
        initializeStaticCompatMethods();
    }

    static Method sMethodRegisterMediaButtonEventReceiver;
    static Method sMethodUnregisterMediaButtonEventReceiver;

    static void initializeStaticCompatMethods() {
        try {
            sMethodRegisterMediaButtonEventReceiver = AudioManager.class.getMethod(
                    "registerMediaButtonEventReceiver",
                    new Class[] { ComponentName.class });
            sMethodUnregisterMediaButtonEventReceiver = AudioManager.class.getMethod(
                    "unregisterMediaButtonEventReceiver",
                    new Class[] { ComponentName.class });
        } catch (NoSuchMethodException e) {
            // Silently fail when running on an OS before API level 8.
        }
    }

    public static void registerMediaButtonEventReceiverCompat(AudioManager audioManager,
            ComponentName receiver) {
        if (sMethodRegisterMediaButtonEventReceiver == null)
            return;

        try {
            sMethodRegisterMediaButtonEventReceiver.invoke(audioManager, receiver);
        } catch (InvocationTargetException e) {
            // Unpack original exception when possible
            Throwable cause = e.getCause();
            if (cause instanceof RuntimeException) {
                throw (RuntimeException) cause;
            } else if (cause instanceof Error) {
                throw (Error) cause;
            } else {
                // Unexpected checked exception; wrap and re-throw
                throw new RuntimeException(e);
            }
        } catch (IllegalAccessException e) {
            Log.e(TAG, "IllegalAccessException invoking registerMediaButtonEventReceiver.");
            e.printStackTrace();
        }
    }

    @SuppressWarnings("unused")
    public static void unregisterMediaButtonEventReceiverCompat(AudioManager audioManager,
            ComponentName receiver) {
        if (sMethodUnregisterMediaButtonEventReceiver == null)
            return;

        try {
            sMethodUnregisterMediaButtonEventReceiver.invoke(audioManager, receiver);
        } catch (InvocationTargetException e) {
            // Unpack original exception when possible
            Throwable cause = e.getCause();
            if (cause instanceof RuntimeException) {
                throw (RuntimeException) cause;
            } else if (cause instanceof Error) {
                throw (Error) cause;
            } else {
                // Unexpected checked exception; wrap and re-throw
                throw new RuntimeException(e);
            }
        } catch (IllegalAccessException e) {
            Log.e(TAG, "IllegalAccessException invoking unregisterMediaButtonEventReceiver.");
            e.printStackTrace();
        }
    }
}

另请查看此开发人员应用程序，了解如何集成RemoteControlClient：Random Music Player但RemoteControlClient的UI根据设备延迟，您无法将其UI更新为您自己的UI，但您可以控制显示和显示音乐应用程序的组件和控件。

更新

上面提到的类现在已弃用。因此，请与Media Session核实并相应更新。

Answer 2

RemoteControlClient是您正在寻找的，但现在它已被弃用并已被MediaSession取代。

文档在这里：https://developer.android.com/reference/android/media/session/MediaSession.html