平台：

 RK3399+android7.1

开机启动apk

 (1)修改类：

./frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

（2）修改代码位置：

boolean startHomeActivityLocked(int userId, String reason) {
        if (mFactoryTest == FactoryTest.FACTORY_TEST_LOW_LEVEL
                && mTopAction == null) {
            // We are running in factory test mode, but unable to find
            // the factory test app, so just sit around displaying the
            // error message and don't try to start anything.
            return false;
        }
        Intent intent = getHomeIntent();
        ActivityInfo aInfo = resolveActivityInfo(intent, STOCK_PM_FLAGS, userId);
        if (aInfo != null) {
            intent.setComponent(new ComponentName(aInfo.applicationInfo.packageName, aInfo.name));
            // Don't do this if the home app is currently being
            // instrumented.
            aInfo = new ActivityInfo(aInfo);
            aInfo.applicationInfo = getAppInfoForUser(aInfo.applicationInfo, userId);
            ProcessRecord app = getProcessRecordLocked(aInfo.processName,
                    aInfo.applicationInfo.uid, true);
            if (app == null || app.instrumentationClass == null) {
                intent.setFlags(intent.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);
                mActivityStarter.startHomeActivityLocked(intent, aInfo, reason);
            }
        } else {
            Slog.wtf(TAG, "No home screen found for " + intent, new Throwable());
        }


        //完全开机后启动app
          startAppOrService(mContext,"com.tencent.mm");

        return true;
    }

（3）启动apk方法：

       /**
     * start 新增启动第三方应用的方法
     */
    private void startAppOrService(Context context,String appPackage) {
        PackageManager doupackageManager = context.getPackageManager();
        Intent intent = new Intent();
        try{
            intent = doupackageManager.getLaunchIntentForPackage(appPackage);
            if(intent!=null){
                context.startActivity(intent);
                Slog.wtf(TAG,"startApp="+appPackage);
             }else{
               Slog.wtf(TAG,"startApp=null");
             }
        }catch(Exception e){
            Slog.wtf(TAG,"startApp_exception");
        }
    }