Add Mic Toggle button to AppRTCDemo (Android).

webrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java

Index: webrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java
diff --git a/webrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java b/webrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java
index 04b563949d96817a38dc6add9d195445d77340f5..6523ffa443074f6f124da0eada037e703055aff4 100644
--- a/webrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java
+++ b/webrtc/examples/androidapp/src/org/appspot/apprtc/CallFragment.java
@@ -31,6 +31,7 @@ public class CallFragment extends Fragment {
   private ImageButton disconnectButton;
   private ImageButton cameraSwitchButton;
   private ImageButton videoScalingButton;
+  private ImageButton toggleMuteButton;
   private TextView captureFormatText;
   private SeekBar captureFormatSlider;
   private OnCallEvents callEvents;
@@ -45,6 +46,7 @@ public class CallFragment extends Fragment {
     public void onCameraSwitch();
     public void onVideoScalingSwitch(ScalingType scalingType);
     public void onCaptureFormatChange(int width, int height, int framerate);
+    public boolean onToggleMic();
   }
 
   @Override
@@ -62,6 +64,8 @@ public class CallFragment extends Fragment {
         (ImageButton) controlView.findViewById(R.id.button_call_switch_camera);
     videoScalingButton =
         (ImageButton) controlView.findViewById(R.id.button_call_scaling_mode);
+    toggleMuteButton =
+        (ImageButton) controlView.findViewById(R.id.button_call_toggle_mic);
     captureFormatText =
         (TextView) controlView.findViewById(R.id.capture_format_text_call);
     captureFormatSlider =
@@ -99,6 +103,14 @@ public class CallFragment extends Fragment {
     });
     scalingType = ScalingType.SCALE_ASPECT_FILL;
 
+    toggleMuteButton.setOnClickListener(new View.OnClickListener() {
+      @Override
+      public void onClick(View view) {
+        boolean enabled = callEvents.onToggleMic();
+        toggleMuteButton.setAlpha(enabled ? 1.0f : 0.3f);
+      }
+    });
+
     return controlView;
   }