blocks|key|198966|text|我找到了答案:有必要使用WindowManager并从服务中调用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|198967|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I found the answer: it is necessary to use WindowManager and call it from Service.

blocks|key|198985|text|示例和简单的代码(在Jelly+Bean、SGS2上测试)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|198986|public+class+BackgroundVideoRecorder+extends+Service+implements+SurfaceHolder.Callback+{

++++private+WindowManager+windowManager;
++++private+SurfaceView+surfaceView;
++++private+Camera+camera+=+null;
++++private+MediaRecorder+mediaRecorder+=+null;

++++@Override
++++public+void+onCreate()+{

++++++++//+Start+foreground+service+to+avoid+unexpected+kill
++++++++Notification+notification+=+new+Notification.Builder(this)
++++++++++++.setContentTitle("Background+Video+Recorder")
++++++++++++.setContentText("")
++++++++++++.setSmallIcon(R.drawable.ic_launcher)
++++++++++++.build();
++++++++startForeground(1234,+notification);

++++++++//+Create+new+SurfaceView,+set+its+size+to+1x1,+move+it+to+the+top+left+corner+and+set+this+service+as+a+callback
++++++++windowManager+=+(WindowManager)+this.getSystemService(Context.WINDOW_SERVICE);
++++++++surfaceView+=+new+SurfaceView(this);
++++++++LayoutParams+layoutParams+=+new+WindowManager.LayoutParams(
++++++++++++1,+1,
++++++++++++WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
++++++++++++WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
++++++++++++PixelFormat.TRANSLUCENT
++++++++);
++++++++layoutParams.gravity+=+Gravity.LEFT+%7C+Gravity.TOP;
++++++++windowManager.addView(surfaceView,+layoutParams);
++++++++surfaceView.getHolder().addCallback(this);

++++}

++++//+Method+called+right+after+Surface+created+(initializing+and+starting+MediaRecorder)
++++@Override
++++public+void+surfaceCreated(SurfaceHolder+surfaceHolder)+{

++++++++camera+=+Camera.open();
++++++++mediaRecorder+=+new+MediaRecorder();
++++++++camera.unlock();

++++++++mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
++++++++mediaRecorder.setCamera(camera);
++++++++mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
++++++++mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
++++++++mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));

++++++++mediaRecorder.setOutputFile(
++++++++++++++++Environment.getExternalStorageDirectory()%2B"/"%2B
++++++++++++++++DateFormat.format("yyyy-MM-dd_kk-mm-ss",+new+Date().getTime())%2B
++++++++++++++++".mp4"
++++++++);

++++++++try+{+mediaRecorder.prepare();+}+catch+(Exception+e)+{}
++++++++mediaRecorder.start();

++++}

++++//+Stop+recording+and+remove+SurfaceView
++++@Override
++++public+void+onDestroy()+{

++++++++mediaRecorder.stop();
++++++++mediaRecorder.reset();
++++++++mediaRecorder.release();

++++++++camera.lock();
++++++++camera.release();

++++++++windowManager.removeView(surfaceView);

++++}

++++@Override
++++public+void+surfaceChanged(SurfaceHolder+surfaceHolder,+int+format,+int+width,+int+height)+{}

++++@Override
++++public+void+surfaceDestroyed(SurfaceHolder+surfaceHolder)+{}

++++@Override
++++public+IBinder+onBind(Intent+intent)+{+return+null;+}

}|code-block|syntax|javascript|198987|别忘了权限：|198988|<uses-permission+android:name="android.permission.CAMERA"+/>
<uses-permission+android:name="android.permission.RECORD_AUDIO"+/>
<uses-permission+android:name="android.permission.SYSTEM_ALERT_WINDOW"+/>
<uses-permission+android:name="android.permission.WRITE_EXTERNAL_STORAGE"+/>|198989|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Sample and simple code (tested on Jelly Bean, SGS2):

<pre><code>public class BackgroundVideoRecorder extends Service implements SurfaceHolder.Callback {

 private WindowManager windowManager;
 private SurfaceView surfaceView;
 private Camera camera = null;
 private MediaRecorder mediaRecorder = null;

 @Override
 public void onCreate() {

 // Start foreground service to avoid unexpected kill
 Notification notification = new Notification.Builder(this)
 .setContentTitle("Background Video Recorder")
 .setContentText("")
 .setSmallIcon(R.drawable.ic_launcher)
 .build();
 startForeground(1234, notification);

 // Create new SurfaceView, set its size to 1x1, move it to the top left corner and set this service as a callback
 windowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
 surfaceView = new SurfaceView(this);
 LayoutParams layoutParams = new WindowManager.LayoutParams(
 1, 1,
 WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
 WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
 PixelFormat.TRANSLUCENT
 );
 layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
 windowManager.addView(surfaceView, layoutParams);
 surfaceView.getHolder().addCallback(this);

 }

 // Method called right after Surface created (initializing and starting MediaRecorder)
 @Override
 public void surfaceCreated(SurfaceHolder surfaceHolder) {

 camera = Camera.open();
 mediaRecorder = new MediaRecorder();
 camera.unlock();

 mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
 mediaRecorder.setCamera(camera);
 mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
 mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
 mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));

 mediaRecorder.setOutputFile(
 Environment.getExternalStorageDirectory()+"/"+
 DateFormat.format("yyyy-MM-dd_kk-mm-ss", new Date().getTime())+
 ".mp4"
 );

 try { mediaRecorder.prepare(); } catch (Exception e) {}
 mediaRecorder.start();

 }

 // Stop recording and remove SurfaceView
 @Override
 public void onDestroy() {

 mediaRecorder.stop();
 mediaRecorder.reset();
 mediaRecorder.release();

 camera.lock();
 camera.release();

 windowManager.removeView(surfaceView);

 }

 @Override
 public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {}

 @Override
 public void surfaceDestroyed(SurfaceHolder surfaceHolder) {}

 @Override
 public IBinder onBind(Intent intent) { return null; }

}
</code></pre>

Don't forget about permissions:

<pre><code>&lt;uses-permission android:name="android.permission.CAMERA" /&gt;
&lt;uses-permission android:name="android.permission.RECORD_AUDIO" /&gt;
&lt;uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /&gt;
&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
</code></pre>

blocks|key|196519|text|try+{+
++++++++mediaRecorder.prepare();+
++++}+catch+(Exception+e)+{}
++++mediaRecorder.start();
++++Timer+t+=+new+Timer();
++++t.schedule(new+TimerTask()+{
++++++++@Override
++++++++public+void+run()+{
++++++++++++stopSelf();
++++++++}
++++},+5000);
}catch(Exception+e){}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|196520|只需对上面的计时器稍作修改，即可根据您的需要将5秒文件保存到ur+sdcard...modify中的根文件夹中。它在Nexus+4和Micromax上也能工作。|unstyled|196521|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>try { 
 mediaRecorder.prepare(); 
 } catch (Exception e) {}
 mediaRecorder.start();
 Timer t = new Timer();
 t.schedule(new TimerTask() {
 @Override
 public void run() {
 stopSelf();
 }
 }, 5000);
}catch(Exception e){}
</code></pre>

Just a small modification to the above code...it will save the 5sec file to the root folder in ur sdcard...modify the timer according to ur need. and it worked on Nexus 4 and Micromax as well..

I try to organize background video recording in Android 4.0. But I can't do it because of these problems:

<ol>
<li>Dummy Surface does not work in MediaRecorder (error: invalid surface)</li>
<li>If you use Surface 1 x 1 px on Activity, Surface is destroyed on Activity pause (recording is stopped)</li>
<li>If you use Surface 1 x 1 px on WindowsManager, Surface is destroyed on Application pause (recording is stopped)</li>
<li>SurfaceTexture does not work in MediaRecorder.setPreviewDisplay(new Surface(SurfaceTexture))</li>
<li>Widget does not allow to handle Surface 1 x 1 px</li>
<li>Status Bar does not allow to handle Surface 1 x 1 px</li>
</ol>

Please, help me to find right way.

Background video recording in Android 4.0

我尝试在Android4.0中组织背景视频录制。但由于这些问题，我不能这样做：虚拟表面在MediaRecorder中不起作用(错误:无效表面)如果您在活动时使用表面1 x 1像素，表面在活动暂停时被销毁(录制停止)如果您在WindowsManager上使用表面1 x 1 px，则表面在应用程序暂停时被销毁(录制在Med...

问Android 4.0中的后台视频录制
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Android 4.0中的后台视频录制EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Android 4.0中的后台视频录制
EN