Android8.1 默认给第三方 app 授予所有权限

前言

说下大体修改思路，app 安装成功、卸载、升级分别对应 Intent.ACTION_PACKAGE_ADDED、Intent.ACTION_PACKAGE_REMOVED、Intent.ACTION_PACKAGE_REPLACED 广播

这样可以在收到安装成功的广播时给 app 授权，在 8.1 中收不到静态注册的广播，所以需要动态注册监听 ACTION_PACKAGE_ADDED。之前看过 PackageInstaller 的源码，通过

app 的包名可获取到需要授权的权限清单列表并进行授权。

安装成功权限列表

enbPAO.png

安装时授权的log

enHon0.png

代码

源码位置 vendor\mediatek\proprietary\packages\apps\PackageInstaller

1、新增 PackageChangedService.java 服务，在服务中动态注册 app 状态改变的广播

package com.android.packageinstaller;


import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;
import android.net.Uri;

public class PackageChangedService extends Service {

    private final String TAG = "permission";

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "onCreate OK");
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e(TAG, "onStartCommand OK");
        packageChangedBroadcastReceiver = new PackageChangedBroadcastReceiver();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
        intentFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);
        intentFilter.addAction(Intent.ACTION_PACKAGE_REPLACED);
        intentFilter.addDataScheme("package");
        registerReceiver(packageChangedBroadcastReceiver, intentFilter);

        return super.onStartCommand(intent, flags, startId);
    }


    @Override
    public void onDestroy() {
        try{
            unregisterReceiver(packageChangedBroadcastReceiver);
        }catch(Exception e){
            e.printStackTrace();
        }
        super.onDestroy();
    }



    private PackageChangedBroadcastReceiver packageChangedBroadcastReceiver;

    private class PackageChangedBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            try{
                String action = intent.getAction();
                String packageName = intent.getData().getSchemeSpecificPart();
                Log.e(TAG, "PackageChangedBroadcastReceiver action==" + action);
                Log.i(TAG, "PackageChangedBroadcastReceiver packageName==" + packageName);

                if (Intent.ACTION_PACKAGE_ADDED.equals(action)) {
                    //给 app 授权
                    PermissionGrantHelper.slientGrantRuntimePermission(context, packageName);

                } else if (Intent.ACTION_PACKAGE_REMOVED.equals(action)) {

                } else if (Intent.ACTION_PACKAGE_REPLACED.equals(action)) {
                    //收到 app 替换成功的广播，将广播转发给用户，通过增加 0x01000000，可以通过静态注册接收
                    Intent ccIntent = new Intent();
                    ccIntent.setAction("android.intent.action.MY_PACKAGE_REPLACED");
                    ccIntent.setData(Uri.parse("package:" + packageName));
                    ccIntent.addFlags(0x01000000);
                    context.sendBroadcast(ccIntent);
                }
            }catch(Exception e){
                e.printStackTrace();
            }
        }
    }
}

上面的代码主要干了两件事，

一、收到 app 安装成功的广播，获取 app 的包名，传递 app 包名进行权限清单查询并判断未授权则自动授权

二、解决 app 静态注册无法收到 升级成功替换的广播，此处收到动态注册的 PACKAGE_REPLACED 广播，通过增加 addFlags(0x01000000) 属性，以 MY_PACKAGE_REPLACED 的方式转发出去

2、新增 PermissionGrantHelper.java 授权工具类，通过包名查询权限清单并授权

package com.android.packageinstaller;

import android.content.Context;
import android.util.Log;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import com.android.packageinstaller.permission.model.AppPermissionGroup;
import com.android.packageinstaller.permission.model.AppPermissions;
import com.android.packageinstaller.permission.model.Permission;
import com.android.packageinstaller.permission.utils.ArrayUtils;
import com.android.packageinstaller.permission.utils.Utils;
import java.util.List;


public class PermissionGrantHelper{

    public static void slientGrantRuntimePermission(Context context, String packageName){
        PackageInfo packageInfo;

        try {
            packageInfo =  context.getPackageManager().getPackageInfo(packageName, PackageManager.GET_PERMISSIONS);
        } catch (PackageManager.NameNotFoundException e) {
            Log.e("permission", "can't get PackageInfo for packageName="+ packageName);
            return;
        }
        
       AppPermissions  mAppPermissions = new AppPermissions(context, packageInfo, null, false,
                new Runnable() {
                    @Override
                    public void run() {
                        
                    }
                });

       Log.e("permission", " AppPermissionGroup size=="+mAppPermissions.getPermissionGroups().size());
       if (mAppPermissions.getPermissionGroups().isEmpty()) {
            Log.e("permission", "mAppPermissions size isEmpty");
            return;
        }
        for (AppPermissionGroup group : mAppPermissions.getPermissionGroups()) {
            String[] permissionsToGrant = null;
            final int permissionCount = group.getPermissions().size();
            for (int j = 0; j < permissionCount; j++) {
                final Permission permission = group.getPermissions().get(j);
                if (!permission.isGranted()) {
                    permissionsToGrant = ArrayUtils.appendString(
                            permissionsToGrant, permission.getName());
                     Log.e("permission", "permissionName=" + permission.getName());
                }
            }
            if (permissionsToGrant != null) {
                group.grantRuntimePermissions(false, permissionsToGrant);
                Log.i("permission", "grantRuntimePermissions permissionsToGrant");
                //group.revokeRuntimePermissions(false);
            }
        }
    }
    
}

3、在配置文件中注册 PackageChangedService，并收到开机广播后启动 PackageChangedService

    
        ....

        

            
                
                    
                
            
    
            

            .....
        

注意上面配置文件中的 android:sharedUserId="android.uid.system"，源码默认未添加此属性，8.1 中普通 app 的后台开启服务会报错，

java.lang.IllegalStateException: Not allowed to start service Intent { flg=0x10000000 cmp=XXXX }: app is in background uid UidRecord{9327d82 u0a489 RCVR bg:+5m35s828ms idle change:uncached

查阅网上说的大都是将 startService(intent) 替换为 startForegroundService(intent)，还需要在 service 的 onStartCommand 中，调用 startForeground(1, new Notification()) 来保活

既然我们是安卓源码直接添加 uid 属性完事。

再在 TemporaryFileManager 中收到开机广播后添加 context.startService(new Intent(context, PackageChangedService.class));