android 手机后台播音乐，设置闹钟，打一通电话，挂断电话后，闹钟与音乐同时响起

修改：

frameworks\base\media\java\android\media\MediaFocusControl.java：

1、import packages：

import com.android.internal.telephony.ITelephony;

import android.os.ServiceManager;

2、增加获取当前Phone Call State的方法getPhoneCallState()：

    private int getPhoneCallState(){

       int phoneCallState = TelephonyManager.CALL_STATE_IDLE;

       TelephonyManager telephonyManager = (TelephonyManager)mContext.getSystemService(Context.TELEPHONY_SERVICE);

       ITelephony telephonyService = ITelephony.Stub.asInterface(ServiceManager.getService(Context.TELEPHONY_SERVICE));

       if (telephonyService != null) {

           Log.w(TAG, "getPhoneCallState: mTelephonyService != null");

            try {

                phoneCallState = telephonyService.getPreciseCallState();

              Log.w(TAG, "getPhoneCallState: telephonyService.getPreciseCallState() = " + phoneCallState);

            } catch (RemoteException ex) {

              if(telephonyManager != null){

                    phoneCallState = telephonyManager.getCallState();

                  Log.w(TAG, "getPhoneCallState: telephonyManager.getCallState() = " + phoneCallState);

              }

                Log.w(TAG, "Catch exception when getPreciseCallState: ex = "

                        + ex.getMessage());

            }

        } else {

           Log.w(TAG, "getPhoneCallState: telephonyService == null");

           if(telephonyManager != null){

                phoneCallState = telephonyManager.getCallState();

              Log.w(TAG, "getPhoneCallState: telephonyManager.getCallState() = " + phoneCallState);

           }

        }

        Log.w(TAG, "getPhoneCallState: phoneCallState = " + phoneCallState);

       return phoneCallState;

    }

3、修改

    private boolean canReassignAudioFocus() {

        // focus requests are rejected during a phone call or when the phone is ringing

        // this is equivalent to IN_VOICE_COMM_FOCUS_ID having the focus

        if (!mFocusStack.isEmpty() && mFocusStack.peek().hasSameClient(IN_VOICE_COMM_FOCUS_ID)) {

            return false;

        }

        return true;

    }

为

    private boolean canReassignAudioFocus() {

        // focus requests are rejected during a phone call or when the phone is ringing

        // this is equivalent to IN_VOICE_COMM_FOCUS_ID having the focus        

        if (!mFocusStack.isEmpty() && mFocusStack.peek().hasSameClient(IN_VOICE_COMM_FOCUS_ID) && (getPhoneCallState() != TelephonyManager.CALL_STATE_IDLE)) {

           Log.w(TAG, "canReassignAudioFocus: return false");

            return false;

        }

       Log.w(TAG, "canReassignAudioFocus: return true");

        return true;

    }