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有项目需要客户要安装第三方软件，但是要手动点击打开权限，就想不动手就打开。

//安装第三方软件，修改方式

frameworks\base\services\core\java\com\android\server\pm\PackageManagerService.java

//找到如下源码：

//有三种方式，但是只有1 或 3 ，两种方式有用

    // Now that we successfully installed the package, grant runtime
    // permissions if requested before broadcasting the install. Also
    // for legacy apps in permission review mode we clear the permission
    // review flag which is used to emulate runtime permissions for
    // legacy apps.
    if (grantPermissions) {
        final int callingUid = Binder.getCallingUid();
        mPermissionManager.grantRequestedRuntimePermissions(
                res.pkg, res.newUsers, grantedPermissions, callingUid);
    }
    
    //如下修改
    if (packageName.equals("com.android.test")) {
        final int callingUid = Binder.getCallingUid();
        
        //1 该方法打开所有请求的权限
        mPermissionManager.grantRequestedRuntimePermissions(
                res.pkg, res.newUsers, grantedPermissions, callingUid);
        
        //2 该方法似乎不起作用
        //grantRuntimePermission(packageName,"android.permission.SYSTEM_OVERLAY_WINDOW",res.uid);
        //grantRuntimePermission(packageName,"android.permission.SYSTEM_ALERT_WINDOW",res.uid);
        //grantRuntimePermission(packageName,"android.permission.MANAGE_APP_ALL_FILES_ACCESS_PERMISSION",res.uid);
        
        //3 只打开一个 SYSTEM_ALERT_WINDOW 权限
        AppOpsManager mAppOpsManager = mContext.getSystemService(AppOpsManager.class);
        mAppOpsManager.setMode(AppOpsManager.OP_SYSTEM_ALERT_WINDOW,
            res.uid, packageName,AppOpsManager.MODE_ALLOWED);
    }
   

//内置应用权限修改方式：

frameworks\base\services\core\java\com\android\server\pm\permission\DefaultPermissionGrantPolicy.java

private void grantDefaultSystemHandlerPermissions(PackageManagerWrapper pm, int 
userId) {

//末尾加入

grantMyPermissions(pm, "com.android.test", userId);

}

private void grantMyPermissions(PackageManagerWrapper pm,String pkg,int userId){Log.i(TAG,"other package Permissions");PackageInfo pkginfo = pm.getPackageInfo(pkg);if(pkginfo==null){return;}Set<String> permissions = new ArraySet<>();permissions.add("android.permission.SYSTEM_OVERLAY_WINDOW");permissions.add("android.permission.SYSTEM_ALERT_WINDOW");permissions.add("android.permission.WRITE_EXTERNAL_STORAGE");permissions.add("android.permission.READ_EXTERNAL_STORAGE");grantRuntimePermissions(pm,pkginfo, permissions,false, userId);
}