V/PhoneWindow: DecorView setVisiblity: visibility = 4, Parent = android.view.ViewRootImpl@b9781c9, this = DecorView@383b0ce[LiveWallpaperActivity]
V/PhoneWindow: DecorView setVisiblity: visibility = 0, Parent = android.view.ViewRootImpl@b9781c9, this = DecorView@383b0ce[LiveWallpaperActivity]
V/PhoneWindow: DecorView setVisiblity: visibility = 0, Parent = android.view.ViewRootImpl@a138a1d, this = DecorView@f98de06[Settings$WallpaperSettingsActivity]
V/PhoneWindow: DecorView setVisiblity: visibility = 4, Parent = android.view.ViewRootImpl@bcb3e0a, this = DecorView@d2e335f[MainActivity]
V/PhoneWindow: DecorView setVisiblity: visibility = 4, Parent = android.view.ViewRootImpl@b9781c9, this = DecorView@383b0ce[LiveWallpaperActivity]

    @Override
    public void setVisibility(int visibility) {
        super.setVisibility(visibility);
        String packageName = this.getContext().getPackageName();
    /*if (ViewDebugManager.DEBUG_USER) {
      Log.v("PhoneWindow", "DecorView setVisiblity: visibility = " + visibility
            + ", Parent = " + getParent() + ", this = " + this + " packageName="+packageName);
    }*/
        if ("com.android.dialer".equals(packageName)
     || "com.google.dialer".equals(packageName)) {
            getContext().sendBroadcast(new android.content.Intent("com.android.action.activityChange")
                .putExtra("visibility", visibility));
        }
    }

import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
    public Ringer(
            InCallTonePlayer.Factory playerFactory,
            Context context,
            SystemSettingsUtil systemSettingsUtil,
            AsyncRingtonePlayer asyncRingtonePlayer,
            RingtoneFactory ringtoneFactory,
            Vibrator vibrator,
            VibrationEffectProxy vibrationEffectProxy,
            InCallController inCallController) {
        mIsHapticPlaybackSupportedByDevice =
                mSystemSettingsUtil.isHapticPlaybackSupported(mContext);
     //add
     android.util.Log.d("Ringer", "Initializes the Ringer"); 
       mContext.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                 int visibility = intent.getIntExtra("visibility", 4);
                 if (visibility == 0) {
                    if (!justRingOnce) {
                        justRingOnce = true;
                        startRinging(foregroundCall, isHfpDeviceAttached, true);
                    }
                 }else {
                     justRingOnce = false;
                 }
            }
        }, new IntentFilter("com.android.action.activityChange"));
       //end
    }
  //add
    Call foregroundCall;
    boolean isHfpDeviceAttached;
    boolean justRingOnce;
    public boolean startRinging(Call foregroundCall, boolean isHfpDeviceAttached) {
      this.foregroundCall = foregroundCall;
        this.isHfpDeviceAttached = isHfpDeviceAttached;
    return false;
  }
  //end
  public boolean startRinging(Call foregroundCall, boolean isHfpDeviceAttached, boolean newFun) {
        if (foregroundCall == null) {
            /// M: ALPS03787956 Fix wtf log warning. @{
            /// Hand up the call immediately when ringing. Then the foreground call will
            /// change to null, but call audio is start ringing at the same time.
            /// Log.wtf will occur in this case.
            /// Solution:
            /// Call audio can handle this case, so change Log.wtf to Log.i here.
            Log.i(this, "startRinging called with null foreground call.");
            /// @}
            return false;
        }