SystemUI中监听app启动，修改app中的状态栏背景色

参考 http://www.2cto.com/kf/201206/137225.html

从Android4.4开始，app可以自定义status bar 背景。 对于一些第三方app定义的状态栏背景，可以在系统源码中对其修改。

SystemUI是随着SystemUIService启动的，SystemUIService是常驻内存的，所以可以增加实时监听/观察功能。

PhoneStatusBar.java中

import android.app.IActivityManager;
import android.app.ActivityManagerNative;
import android.app.IActivityController;

IActivityManager mAm;

@Override
    public void start() {
        ……
        ……
             mAm = ActivityManagerNative.getDefault();
        try {
            mAm.setActivityController(new ActivityController());
        } catch (RemoteException e) {
        }

    }

    private class ActivityController extends IActivityController.Stub {
        private boolean needUpdate = false;
        public boolean activityStarting(Intent intent, String pkg) {
            Log.d("antoon", "activityStarting, --> "+pkg);
            if("com.android.mms".equals(pkg)){
                mBgHandler.sendEmptyMessage(updateBg);
                needUpdate = true;
            }else if(needUpdate){
                mBgHandler.sendEmptyMessage(rebackBg);
                needUpdate = false;
            }
            return true;
        }

        public boolean activityResuming(String pkg) {
            Log.d("antoon", "activityResuming, --> "+pkg);
            return true;
        }

        public boolean appCrashed(String processName, int pid,
                                  String shortMsg, String longMsg,
                                  long timeMillis, String stackTrace) {
            return false;
        }

        public int appEarlyNotResponding(String processName, int pid, String annotation){
            return 0;
        }

        public int appNotResponding(String processName, int pid, String processStats) {
            return 0;
        }

        public int systemNotResponding(String msg){
            return -1;
        }
    }

    private final int updateBg = 1;
    private final int rebackBg = 2;

    private Handler mBgHandler = new Handler(){
        public void handleMessage(Message msg) {
            Log.d("antoon", "mBgHandler, ---, msg = "+msg);
            switch (msg.what){
                case updateBg:
                    mStatusBarView.setBackgroundColor(Color.BLUE);
                    break;
                case rebackBg:
                    mStatusBarView.setBackgroundColor(R.color.system_bar_background_opaque);
                    break;
            }
        }
    };

android\frameworks\base\core\java\android\app\IActivityController.aidl

/*
**
** Copyright 2009, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

package android.app;

import android.content.Intent;

/**
 * Testing interface to monitor what is happening in the activity manager
 * while tests are running.  Not for normal application development.
 * {@hide}
 */
interface IActivityController
{
    /**
     * The system is trying to start an activity.  Return true to allow
     * it to be started as normal, or false to cancel/reject this activity.
     */
    boolean activityStarting(in Intent intent, String pkg);

    /**
     * The system is trying to return to an activity.  Return true to allow
     * it to be resumed as normal, or false to cancel/reject this activity.
     */
    boolean activityResuming(String pkg);

    /**
     * An application process has crashed (in Java).  Return true for the
     * normal error recovery (app crash dialog) to occur, false to kill
     * it immediately.
     */
    boolean appCrashed(String processName, int pid,
            String shortMsg, String longMsg,
            long timeMillis, String stackTrace);

    /**
     * Early call as soon as an ANR is detected.
     */
    int appEarlyNotResponding(String processName, int pid, String annotation);

    /**
     * An application process is not responding.  Return 0 to show the "app
     * not responding" dialog, 1 to continue waiting, or -1 to kill it
     * immediately.
     */
    int appNotResponding(String processName, int pid, String processStats);

    /**
     * The system process watchdog has detected that the system seems to be
     * hung.  Return 1 to continue waiting, or -1 to let it continue with its
     * normal kill.
     */
    int systemNotResponding(String msg);
}