VideoCaptureAndroid: rewrote the (standalone) implementation of video capture on Android.

Besides being ~40% the size of the previous implementation, this makes it so
that VideoCaptureAndroid can stop and restart capture, which is necessary to
support onPause/onResume reasonably on Android.

BUG=1407
R=henrike@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2334004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4915 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/examples/android/src/org/appspot/apprtc/AppRTCDemoActivity.java

@@ -156,19 +156,18 @@ public class AppRTCDemoActivity extends Activity
   public void onPause() {
     super.onPause();
     vsv.onPause();
-    // TODO(fischman): IWBN to support pause/resume, but the WebRTC codebase
-    // isn't ready for that yet; e.g.
-    // https://code.google.com/p/webrtc/issues/detail?id=1407
-    // Instead, simply exit instead of pausing (the alternative leads to
-    // system-borking with wedged cameras; e.g. b/8224551)
-    disconnectAndExit();
+    if (videoSource != null) {
+      videoSource.stop();
+    }
   }
 
   @Override
   public void onResume() {
-    // The onResume() is a lie!  See TODO(fischman) in onPause() above.
     super.onResume();
     vsv.onResume();
+    if (videoSource != null) {
+      videoSource.restart();
+    }
   }
 
   @Override
@@ -249,7 +248,8 @@ public class AppRTCDemoActivity extends Activity
   }
 
   @Override
-  public void onDestroy() {
+  protected void onDestroy() {
+    disconnectAndExit();
     super.onDestroy();
   }
 
@@ -524,7 +524,6 @@ public class AppRTCDemoActivity extends Activity
         return;
       }
       quit[0] = true;
-      wakeLock.release();
       if (pc != null) {
         pc.dispose();
         pc = null;
@@ -542,6 +541,7 @@ public class AppRTCDemoActivity extends Activity
         factory.dispose();
         factory = null;
       }
+      wakeLock.release();
       finish();
     }
   }

talk/examples/android/src/org/appspot/apprtc/VideoStreamsView.java

@@ -75,6 +75,7 @@ public class VideoStreamsView
   public VideoStreamsView(Context c, Point screenDimensions) {
     super(c);
     this.screenDimensions = screenDimensions;
+    setPreserveEGLContextOnPause(true);
     setEGLContextClientVersion(2);
     setRenderer(this);
     setRenderMode(RENDERMODE_WHEN_DIRTY);