android P广播权限问题Background execution not allowed: receiving Intent和系统受保护广播问题调查

快来打我* 2024-04-17 05:31 47阅读 0赞

### 1、隐式广播权限 ###

android O系统后，隐式广播收到的限制，一定要指定包名才能发送出来。  
否则会报错：  
Background execution not allowed: receiving Intent \{ act=android.bluetooth.anw.action.PAIR\_REQUEST flg=0x10 (has extras) \} to com.anwsdk.sample/.BTMsgReceiver

但是在实际开发测试时，有些旧的app应用还是发送的隐式广播，导致接收不到，临时修改系统源码解决：  
源码：\\frameworks\\base\\services\\core\\java\\com\\android\\server\\am\\BroadcastQueue.java  
processNextBroadcastLocked()对广播进行了判断和处理：

if (!skip) { 
                final int allowed = mService.getAppStartModeLocked(
                        info.activityInfo.applicationInfo.uid, info.activityInfo.packageName,
                        info.activityInfo.applicationInfo.targetSdkVersion, -1, true, false, false);
                if (allowed != ActivityManager.APP_START_MODE_NORMAL) { 
                    // We won't allow this receiver to be launched if the app has been
                    // completely disabled from launches, or it was not explicitly sent
                    // to it and the app is in a state that should not receive it
                    // (depending on how getAppStartModeLocked has determined that).
                    if (allowed == ActivityManager.APP_START_MODE_DISABLED) { 
                        Slog.w(TAG, "Background execution disabled: receiving "
                                + r.intent + " to "
                                + component.flattenToShortString());
                        skip = true;
                    } else if (((r.intent.getFlags()&Intent.FLAG_RECEIVER_EXCLUDE_BACKGROUND) != 0)
                            || (r.intent.getComponent() == null
                                && r.intent.getPackage() == null
                                && ((r.intent.getFlags()
                                        & Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND) == 0)
                                && !isSignaturePerm(r.requiredPermissions))) { 
                        mService.addBackgroundCheckViolationLocked(r.intent.getAction(),
                                component.getPackageName());
                        Slog.w(TAG, "Background execution not allowed: receiving "
                                + r.intent + " to "
                                + component.flattenToShortString());
    			
    					//取消skip=true,让广播依旧可以发送出去
                        //skip = true;
                    }
                }
            }

### 2、受保护的广播 ###

报错：  
ActivityManager: Sending non-protected broadcast …Throwable at

系统中发送的广播必须是受保护的广播，否则发送失败。

源码：\\frameworks\\base\\core\\res\\AndroidManifest.xml

增加：

<protected-broadcast android:name="android.intent.action.DOCK_IDLE" />
        <protected-broadcast android:name="android.intent.action.DOCK_ACTIVE" />