targetSdkVersion 29时错误MediaProjection

问题描述

我正在构建一个屏幕录制应用程序。但这仅适用于targetSdkVersion 28，当通过google请求的targetSdkVersion 29时出现错误

代码

 @SuppressLint("MissingSuperCall")
    @Override
    public void onActivityResult(int requestCode,int resultCode,Intent data) {
        if (requestCode != REQUEST_CODE) {
            Toast.makeText(this,"Error!",Toast.LENGTH_SHORT).show();
            return;
        }
        if (resultCode != RESULT_OK) {
            Toast.makeText(this,"Screen Cast Permission Denied",Toast.LENGTH_SHORT).show();
            return;
        }
        mMediaProjectionCallback = new MediaProjectionCallback();

        mMediaProjection = mProjectionManager.getMediaProjection(resultCode,data);
        mMediaProjection.registerCallback(mMediaProjectionCallback,null);
        mVirtualdisplay = createVirtualdisplay();
        mMediaRecorder.start();
    }

错误

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.megamestudio.screen_record_and_booster,PID: 21862
    java.lang.RuntimeException: Failure delivering result ResultInfo{who=null,request=1000,result=-1,data=Intent { (has extras) }} to activity {com.megamestudio.screen_record_and_booster/com.megamestudio.screen_record_and_booster.MainActivity}: java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION
        at android.app.ActivityThread.deliverResults(ActivityThread.java:4927)
        at android.app.ActivityThread.handleSendResult(ActivityThread.java:4968)
        at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2043)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:224)
        at android.app.ActivityThread.main(ActivityThread.java:7548)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
     Caused by: java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION
        at android.os.Parcel.createException(Parcel.java:2074)
        at android.os.Parcel.readException(Parcel.java:2042)
        at android.os.Parcel.readException(Parcel.java:1990)
        at android.media.projection.IMediaProjection$Stub$Proxy.start(IMediaProjection.java:231)
        at android.media.projection.MediaProjection.<init>(MediaProjection.java:58)
        at android.media.projection.mediaprojectionmanager.getMediaProjection(mediaprojectionmanager.java:104)
        at com.megamestudio.screen_record_and_booster.MainActivity.onActivityResult(MainActivity.java:426)

非常感谢！！！

解决方法

API 29中添加了一个新的服务属性，显然MediaProjection需要使用前台服务，因为该异常已对此进行了说明。这是您需要做的：

1. 创建服务
2. 将服务添加到清单中，
3. 在清单中为您服务，添加android:foregroundServiceType="mediaProjection"
4. 将您的媒体投射代码从活动中移动到服务中。
5. 从您的活动中启动服务，这将启动服务中的媒体投影。

请注意，前台服务需要持久通知和API 26或更高版本的通知通道。