标签：
0、写在前面
1、实现个静音的功能
PM:『我这里有个需求，很简单很简单那种』RD:『哦，需要做三天』PM:『真的很简单很简单那种』RD:『哦，现在需要做六天了』
private void setMuteEnabled(boolean enabled){ AudioManager mAudioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE); mAudioManager.setStreamMute(AudioManager.STREAM_MUSIC, enabled);} |
2、『您好，我是京东快递，您有一个bug签收一下』
QA:『如果我先开启静音，然后退出我们的app再进来，尽管页面显示静音状态，但我无法取消静音啊』RD:『一定是你的用法有问题！』
boolean persistedMute = mute.getContext().getSharedPreferences("volume", Context.MODE_PRIVATE).getBoolean("Volume.Mute", false);muteButton.setChecked(persistedMute); |
private void setMuteEnabled(boolean enabled){ AudioManager mAudioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE); mAudioManager.setStreamMute(AudioManager.STREAM_MUSIC, enabled);} |
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
/** * Mute or unmute an audio stream. * <p> * The mute command is protected against client process death: if a process * with an active mute request on a stream dies, this stream will be unmuted * automatically. * <p> * The mute requests for a given stream are cumulative: the AudioManager * can receive several mute requests from one or more clients and the stream * will be unmuted only when the same number of unmute requests are received. * <p> * For a better user experience, applications MUST unmute a muted stream * in onPause() and mute is again in onResume() if appropriate. * <p> * This method should only be used by applications that replace the platform-wide * management of audio settings or the main telephony application. * <p>This method has no effect if the device implements a fixed volume policy * as indicated by {@link #isVolumeFixed()}. * * @param streamType The stream to be muted/unmuted. * @param state The required mute state: true for mute ON, false for mute OFF * * @see #isVolumeFixed() */public void setStreamMute(int streamType, boolean state) { IAudioService service = getService(); try { service.setStreamMute(streamType, state, mICallBack); } catch (RemoteException e) { Log.e(TAG, "Dead object in setStreamMute", e); }} |
The mute requests for a given stream are cumulative: the AudioManager can receive several mute requests from one or more clients and the stream will be unmuted only when the same number of unmute requests are received.
好像找到答案了。不对呀，我以你的人格担保，我只发了一次静音请求啊，怎么取消静音就这么费劲呢！
4、『这是我的名片』
|
1
2
3
4
5
6
7
8
|
public void setStreamMute(int streamType, boolean state) { IAudioService service = getService(); try { service.setStreamMute(streamType, state, mICallBack); } catch (RemoteException e) { Log.e(TAG, "Dead object in setStreamMute", e); }} |
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
|
/** @see AudioManager#setStreamMute(int, boolean) */public void setStreamMute(int streamType, boolean state, IBinder cb) { if (mUseFixedVolume) { return; } if (isStreamAffectedByMute(streamType)) { if (mHdmiManager != null) { synchronized (mHdmiManager) { if (streamType == AudioSystem.STREAM_MUSIC && mHdmiTvClient != null) { synchronized (mHdmiTvClient) { if (mHdmiSystemAudioSupported) { mHdmiTvClient.setSystemAudioMute(state); } } } } } mStreamStates[streamType].mute(cb, state); }} |
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
public void mute(boolean state) {boolean updateVolume = false;if (state) { if (mMuteCount == 0) { // Register for client death notification try { // mICallback can be 0 if muted by AudioService if (mICallback != null) { mICallback.linkToDeath(this, 0); } VolumeStreamState.this.mDeathHandlers.add(this); // If the stream is not yet muted by any client, set level to 0 if (!VolumeStreamState.this.isMuted()) { updateVolume = true; } } catch (RemoteException e) { // Client has died! binderDied(); return; } } else { Log.w(TAG, "stream: "+mStreamType+" was already muted by this client"); } mMuteCount++;} else { if (mMuteCount == 0) { Log.e(TAG, "unexpected unmute for stream: "+mStreamType); } else { mMuteCount--; if (mMuteCount == 0) { // Unregister from client death notification VolumeStreamState.this.mDeathHandlers.remove(this); // mICallback can be 0 if muted by AudioService if (mICallback != null) { mICallback.unlinkToDeath(this, 0); } if (!VolumeStreamState.this.isMuted()) { updateVolume = true; } } }}if (updateVolume) { sendMsg(mAudioHandler, MSG_SET_ALL_VOLUMES, SENDMSG_QUEUE, 0, 0, VolumeStreamState.this, 0); }} |
|
01
02
03
04
05
06
07
08
09
10
|
private class VolumeDeathHandler implements IBinder.DeathRecipient {private IBinder mICallback; // To be notified of client‘s deathprivate int mMuteCount; // Number of active mutes for this clientVolumeDeathHandler(IBinder cb) { mICallback = cb;}……} |
5、『其实，刚才不是我』
对呀，有名片啊，问题是我这是同一个app啊，同一个啊……问题出在哪里了呢。
|
1
|
private final IBinder mICallBack = new Binder(); |
操曰：『天下英雄，唯使君与操耳』玄德大惊曰：『操耳是哪个嘛？』
|
1
|
AudioManager mAudioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE); |
|
1
2
3
4
5
|
@Overridepublic Object getSystemService(String name) { ServiceFetcher fetcher = SYSTEM_SERVICE_MAP.get(name); return fetcher == null ? null : fetcher.getService(this);} |
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
public Object getService(ContextImpl ctx) { ArrayList<Object> cache = ctx.mServiceCache; Object service; synchronized (cache) { if (cache.size() == 0) { // Initialize the cache vector on first access. // At this point sNextPerContextServiceCacheIndex // is the number of potential services that are // cached per-Context. for (int i = 0; i < sNextPerContextServiceCacheIndex; i++) { cache.add(null); } } else { service = cache.get(mContextCacheIndex); if (service != null) { return service; } } service = createService(ctx); cache.set(mContextCacheIndex, service); return service; } } |
|
1
2
3
4
|
registerService(AUDIO_SERVICE, new ServiceFetcher() { public Object createService(ContextImpl ctx) { return new AudioManager(ctx); }}); |
等会儿让我想会儿静静。它在这里new了一个AudioManager。它怎么能new了一个AudioManager呢。
|
1
|
AudioManager mAudioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE); |
6、『这事儿还是交给同一个人办比较靠谱』
|
1
|
AudioManager mAudioManager = (AudioManager) getContext().getApplicationContext().getSystemService(Context.AUDIO_SERVICE); |
7、结语
标签：
原文地址：http://www.cnblogs.com/krislight1105/p/5203164.html
