我正在开发一个音乐播放器。我有一个可在家庭和锁定屏幕上工作的小部件。我不想让用户选择在锁定屏幕上放置或删除小部件。
我的目标是：
窗口小部件会自动显示在主机锁定屏幕上，删除作为时间日期窗口小部件或放置它的窗口小部件。
始终如一地管理MusicService和Widget。 （当我离开音乐播放器时，从锁定屏幕清除小部件。 这正是我的Galaxy Nexus（或许多其他手机）上的Google Play音乐小部件。这可能吗？是否有可能我需要一些不是小工具的东西，比如自定义锁屏？
答案 0 :(得分：4)
嗯，解决方案很简单，不要使用任何小部件，只需使用RemoteControlClientCompat类。这是我的lockScreenControls（）方法代码，每当我想显示这种类型的控件时，我都会调用它。
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();
}
}
<强> *********** EDIT ************
RemoteControlClientCompat类：
@SuppressWarnings({"rawtypes", "unchecked"})
public class RemoteControlClientCompat {
private static final String TAG = "RemoteControlCompat";
private static Class sRemoteControlClientClass;
// RCC short for RemoteControlClient
private static Method sRCCEditMetadataMethod;
private static Method sRCCSetPlayStateMethod;
private static Method sRCCSetTransportControlFlags;
private static boolean sHasRemoteControlAPIs = false;
static {
try {
ClassLoader classLoader = RemoteControlClientCompat.class.getClassLoader();
sRemoteControlClientClass = getActualRemoteControlClientClass(classLoader);
// dynamically populate the playstate and flag values in case they change
// in future versions.
for (Field field : RemoteControlClientCompat.class.getFields()) {
try {
Field realField = sRemoteControlClientClass.getField(field.getName());
Object realValue = realField.get(null);
field.set(null, realValue);
} catch (NoSuchFieldException e) {
Log.w(TAG, "Could not get real field: " + field.getName());
} catch (IllegalArgumentException e) {
Log.w(TAG, "Error trying to pull field value for: " + field.getName()
+ " " + e.getMessage());
} catch (IllegalAccessException e) {
Log.w(TAG, "Error trying to pull field value for: " + field.getName()
+ " " + e.getMessage());
}
}
// get the required public methods on RemoteControlClient
sRCCEditMetadataMethod = sRemoteControlClientClass.getMethod("editMetadata",
boolean.class);
sRCCSetPlayStateMethod = sRemoteControlClientClass.getMethod("setPlaybackState",
int.class);
sRCCSetTransportControlFlags = sRemoteControlClientClass.getMethod(
"setTransportControlFlags", int.class);
sHasRemoteControlAPIs = true;
} catch (ClassNotFoundException e) {
// Silently fail when running on an OS before ICS.
} catch (NoSuchMethodException e) {
// Silently fail when running on an OS before ICS.
} catch (IllegalArgumentException e) {
// Silently fail when running on an OS before ICS.
} catch (SecurityException e) {
// Silently fail when running on an OS before ICS.
}
}
public static Class getActualRemoteControlClientClass(ClassLoader classLoader)
throws ClassNotFoundException {
return classLoader.loadClass("android.media.RemoteControlClient");
}
private Object mActualRemoteControlClient;
public RemoteControlClientCompat(PendingIntent pendingIntent) {
if (!sHasRemoteControlAPIs) {
return;
}
try {
mActualRemoteControlClient =
sRemoteControlClientClass.getConstructor(PendingIntent.class)
.newInstance(pendingIntent);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public RemoteControlClientCompat(PendingIntent pendingIntent, Looper looper) {
if (!sHasRemoteControlAPIs) {
return;
}
try {
mActualRemoteControlClient =
sRemoteControlClientClass.getConstructor(PendingIntent.class, Looper.class)
.newInstance(pendingIntent, looper);
} catch (Exception e) {
Log.e(TAG, "Error creating new instance of " + sRemoteControlClientClass.getName(), e);
}
}
/**
* Class used to modify metadata in a {@link android.media.RemoteControlClient} object. Use
* {@link android.media.RemoteControlClient#editMetadata(boolean)} to create an instance of an
* editor, on which you set the metadata for the RemoteControlClient instance. Once all the
* information has been set, use {@link #apply()} to make it the new metadata that should be
* displayed for the associated client. Once the metadata has been "applied", you cannot reuse
* this instance of the MetadataEditor.
*/
public class MetadataEditorCompat {
private Method mPutStringMethod;
private Method mPutBitmapMethod;
private Method mPutLongMethod;
private Method mClearMethod;
private Method mApplyMethod;
private Object mActualMetadataEditor;
/**
* The metadata key for the content artwork / album art.
*/
public final static int METADATA_KEY_ARTWORK = 100;
private MetadataEditorCompat(Object actualMetadataEditor) {
if (sHasRemoteControlAPIs && actualMetadataEditor == null) {
throw new IllegalArgumentException("Remote Control API's exist, " +
"should not be given a null MetadataEditor");
}
if (sHasRemoteControlAPIs) {
Class metadataEditorClass = actualMetadataEditor.getClass();
try {
mPutStringMethod = metadataEditorClass.getMethod("putString",
int.class, String.class);
mPutBitmapMethod = metadataEditorClass.getMethod("putBitmap",
int.class, Bitmap.class);
mPutLongMethod = metadataEditorClass.getMethod("putLong",
int.class, long.class);
mClearMethod = metadataEditorClass.getMethod("clear", new Class[]{});
mApplyMethod = metadataEditorClass.getMethod("apply", new Class[]{});
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
mActualMetadataEditor = actualMetadataEditor;
}
/**
* Adds textual information to be displayed.
* Note that none of the information added after {@link #apply()} has been called,
* will be displayed.
* @param key The identifier of a the metadata field to set. Valid values are
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_ALBUM},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_ALBUMARTIST},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_TITLE},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_ARTIST},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_AUTHOR},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_COMPILATION},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_COMPOSER},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_DATE},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_GENRE},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_TITLE},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_WRITER}.
* @param value The text for the given key, or {@code null} to signify there is no valid
* information for the field.
* @return Returns a reference to the same MetadataEditor object, so you can chain put
* calls together.
*/
public MetadataEditorCompat putString(int key, String value) {
if (sHasRemoteControlAPIs) {
try {
mPutStringMethod.invoke(mActualMetadataEditor, key, value);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
return this;
}
/**
* Sets the album / artwork picture to be displayed on the remote control.
* @param key the identifier of the bitmap to set. The only valid value is
* {@link #METADATA_KEY_ARTWORK}
* @param bitmap The bitmap for the artwork, or null if there isn't any.
* @return Returns a reference to the same MetadataEditor object, so you can chain put
* calls together.
* @throws IllegalArgumentException
* @see android.graphics.Bitmap
*/
public MetadataEditorCompat putBitmap(int key, Bitmap bitmap) {
if (sHasRemoteControlAPIs) {
try {
mPutBitmapMethod.invoke(mActualMetadataEditor, key, bitmap);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
return this;
}
/**
* Adds numerical information to be displayed.
* Note that none of the information added after {@link #apply()} has been called,
* will be displayed.
* @param key the identifier of a the metadata field to set. Valid values are
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_CD_TRACK_NUMBER},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_DISC_NUMBER},
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_DURATION} (with a value
* expressed in milliseconds),
* {@link android.media.MediaMetadataRetriever#METADATA_KEY_YEAR}.
* @param value The long value for the given key
* @return Returns a reference to the same MetadataEditor object, so you can chain put
* calls together.
* @throws IllegalArgumentException
*/
public MetadataEditorCompat putLong(int key, long value) {
if (sHasRemoteControlAPIs) {
try {
mPutLongMethod.invoke(mActualMetadataEditor, key, value);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
return this;
}
/**
* Clears all the metadata that has been set since the MetadataEditor instance was
* created with {@link android.media.RemoteControlClient#editMetadata(boolean)}.
*/
public void clear() {
if (sHasRemoteControlAPIs) {
try {
mClearMethod.invoke(mActualMetadataEditor, (Object[]) null);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
}
/**
* Associates all the metadata that has been set since the MetadataEditor instance was
* created with {@link android.media.RemoteControlClient#editMetadata(boolean)}, or since
* {@link #clear()} was called, with the RemoteControlClient. Once "applied", this
* MetadataEditor cannot be reused to edit the RemoteControlClient's metadata.
*/
public void apply() {
if (sHasRemoteControlAPIs) {
try {
mApplyMethod.invoke(mActualMetadataEditor, (Object[]) null);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
}
}
/**
* Creates a {@link android.media.RemoteControlClient.MetadataEditor}.
* @param startEmpty Set to false if you want the MetadataEditor to contain the metadata that
* was previously applied to the RemoteControlClient, or true if it is to be created empty.
* @return a new MetadataEditor instance.
*/
public MetadataEditorCompat editMetadata(boolean startEmpty) {
Object metadataEditor;
if (sHasRemoteControlAPIs) {
try {
metadataEditor = sRCCEditMetadataMethod.invoke(mActualRemoteControlClient,
startEmpty);
} catch (Exception e) {
throw new RuntimeException(e);
}
} else {
metadataEditor = null;
}
return new MetadataEditorCompat(metadataEditor);
}
/**
* Sets the current playback state.
* @param state The current playback state, one of the following values:
* {@link android.media.RemoteControlClient#PLAYSTATE_STOPPED},
* {@link android.media.RemoteControlClient#PLAYSTATE_PAUSED},
* {@link android.media.RemoteControlClient#PLAYSTATE_PLAYING},
* {@link android.media.RemoteControlClient#PLAYSTATE_FAST_FORWARDING},
* {@link android.media.RemoteControlClient#PLAYSTATE_REWINDING},
* {@link android.media.RemoteControlClient#PLAYSTATE_SKIPPING_FORWARDS},
* {@link android.media.RemoteControlClient#PLAYSTATE_SKIPPING_BACKWARDS},
* {@link android.media.RemoteControlClient#PLAYSTATE_BUFFERING},
* {@link android.media.RemoteControlClient#PLAYSTATE_ERROR}.
*/
public void setPlaybackState(int state) {
if (sHasRemoteControlAPIs) {
try {
sRCCSetPlayStateMethod.invoke(mActualRemoteControlClient, state);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
/**
* Sets the flags for the media transport control buttons that this client supports.
* @param transportControlFlags A combination of the following flags:
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_PREVIOUS},
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_REWIND},
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_PLAY},
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_PLAY_PAUSE},
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_PAUSE},
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_STOP},
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_FAST_FORWARD},
* {@link android.media.RemoteControlClient#FLAG_KEY_MEDIA_NEXT}
*/
public void setTransportControlFlags(int transportControlFlags) {
if (sHasRemoteControlAPIs) {
try {
sRCCSetTransportControlFlags.invoke(mActualRemoteControlClient,
transportControlFlags);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
public final Object getActualRemoteControlClientObject() {
return mActualRemoteControlClient;
}
}
RemoteControlHelper类：
public class RemoteControlHelper {
private static final String TAG = "RemoteControlHelper";
private static boolean sHasRemoteControlAPIs = false;
private static Method sRegisterRemoteControlClientMethod;
private static Method sUnregisterRemoteControlClientMethod;
static {
try {
ClassLoader classLoader = RemoteControlHelper.class.getClassLoader();
Class sRemoteControlClientClass =
RemoteControlClientCompat.getActualRemoteControlClientClass(classLoader);
sRegisterRemoteControlClientMethod = AudioManager.class.getMethod(
"registerRemoteControlClient", new Class[]{sRemoteControlClientClass});
sUnregisterRemoteControlClientMethod = AudioManager.class.getMethod(
"unregisterRemoteControlClient", new Class[]{sRemoteControlClientClass});
sHasRemoteControlAPIs = true;
} catch (ClassNotFoundException e) {
// Silently fail when running on an OS before ICS.
} catch (NoSuchMethodException e) {
// Silently fail when running on an OS before ICS.
} catch (IllegalArgumentException e) {
// Silently fail when running on an OS before ICS.
} catch (SecurityException e) {
// Silently fail when running on an OS before ICS.
}
}
public static void registerRemoteControlClient(AudioManager audioManager,
RemoteControlClientCompat remoteControlClient) {
if (!sHasRemoteControlAPIs) {
return;
}
try {
sRegisterRemoteControlClientMethod.invoke(audioManager,
remoteControlClient.getActualRemoteControlClientObject());
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
}
public static void unregisterRemoteControlClient(AudioManager audioManager,
RemoteControlClientCompat remoteControlClient) {
if (!sHasRemoteControlAPIs) {
return;
}
try {
sUnregisterRemoteControlClientMethod.invoke(audioManager,
remoteControlClient.getActualRemoteControlClientObject());
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
}
}
更改lockPlayer状态dinamicaly：
private void lockontrolsPlay() {
if (mRemoteControlClientCompat != null) {
mRemoteControlClientCompat
.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING);
}
}
private void lockontrolsPause() {
if (mRemoteControlClientCompat != null) {
mRemoteControlClientCompat
.setPlaybackState(RemoteControlClient.PLAYSTATE_PAUSED);
}
}
接收者：
public class MusicIntentReceiver extends WakefulBroadcastReceiver {
private int headsetSwitch = 1;
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(android.media.AudioManager.ACTION_AUDIO_BECOMING_NOISY)) {
Toast.makeText(context, MyApplication.getContext().getResources().getString (R.string.aptxt15), Toast.LENGTH_SHORT).show();
intent = new Intent(context, ReproductorDialog.ServicioCanciones.class);
intent.putExtra("do_action", "pause_cascos");
context.startService(intent);
} else if (intent.getAction().equals(Intent.ACTION_MEDIA_BUTTON)) {
KeyEvent keyEvent = (KeyEvent) intent.getExtras().get(Intent.EXTRA_KEY_EVENT);
if (keyEvent.getAction() != KeyEvent.ACTION_DOWN)
return;
switch (keyEvent.getKeyCode()) {
case KeyEvent.KEYCODE_HEADSETHOOK:
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
intent = new Intent(context, ReproductorDialog.ServicioCanciones.class);
intent.putExtra("do_action", "pause");
context.startService(intent);
// context.startService(new Intent(MusicService.ACTION_TOGGLE_PLAYBACK));
break;
case KeyEvent.KEYCODE_MEDIA_PLAY:
// context.startService(new Intent(MusicService.ACTION_PLAY));
intent = new Intent(context, ReproductorDialog.ServicioCanciones.class);
intent.putExtra("do_action", "pause");
context.startService(intent);
break;
case KeyEvent.KEYCODE_MEDIA_PAUSE:
// context.startService(new Intent(MusicService.ACTION_PAUSE));
intent = new Intent(context, ReproductorDialog.ServicioCanciones.class);
intent.putExtra("do_action", "pause");
context.startService(intent);
break;
case KeyEvent.KEYCODE_MEDIA_STOP:
// context.startService(new Intent(MusicService.ACTION_STOP));
break;
case KeyEvent.KEYCODE_MEDIA_NEXT:
intent = new Intent(context, ReproductorDialog.ServicioCanciones.class);
intent.putExtra("do_action", "next");
context.startService(intent);
break;
case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
// TODO: ensure that doing this in rapid succession actually plays the
// previous song
// context.startService(new Intent(MusicService.ACTION_REWIND));
intent = new Intent(context, ReproductorDialog.ServicioCanciones.class);
intent.putExtra("do_action", "previous");
context.startService(intent);
break;
}
}
}
}
mAUdioManager是一个AudioManager对象，mMediaButtonReceiverComponent是一个ComponentName，只需添加
AudioManager mAudioManager;
ComponentName mMediaButtonReceiverComponent;
在调用方法lockScreenControls（）之前。这些类在API 18上