【发布时间】：2020-05-25 14:40:05
【问题描述】：
我有一个用于录制屏幕的应用程序，它在 android 版本 10 上不起作用。据我了解，这是由于 Android 10 中生效的隐私更改。我在清单文件中添加了权限<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />，在服务中添加android:foregroundServiceType="mediaProjection"标签并调用startForeground()方法
Notification.Builder builder = new Notification.Builder(getApplicationContext(), "333")
.setContentTitle(getString(R.string.app_name))
.setContentText("Record")
.setAutoCancel(true);
Notification notification = builder.build();
startForeground(123, notification);
在调用.getMediaProjection() 方法之前，但我的应用程序仍然准确地抛出错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.screen_recording, PID: 9572
java.lang.RuntimeException: Unable to start service com.example.screen_recording.service.RecordService@bb31978 with Intent { cmp=com.example.screen_recording/.service.RecordService (has extras) }: java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4105)
at android.app.ActivityThread.access$1800(ActivityThread.java:219)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1891)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION
at android.os.Parcel.createException(Parcel.java:2071)
at android.os.Parcel.readException(Parcel.java:2039)
at android.os.Parcel.readException(Parcel.java:1987)
at android.media.projection.IMediaProjection$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.example.screen_recording.service.RecordService.onStartRecord(RecordService.java:117)
at com.example.screen_recording.service.RecordService.onStartCommand(RecordService.java:106)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4087)
at android.app.ActivityThread.access$1800(ActivityThread.java:219)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1891)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: android.os.RemoteException: Remote stack trace:
at com.android.server.media.projection.MediaProjectionManagerService$MediaProjection.start(MediaProjectionManagerService.java:476)
at android.media.projection.IMediaProjection$Stub.onTransact(IMediaProjection.java:135)
at android.os.Binder.execTransactInternal(Binder.java:1021)
at android.os.Binder.execTransact(Binder.java:994)
这是服务代码
public class RecordService extends Service {
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
SharedPreferences p;
WindowManager window;
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
private boolean isRecord = false;
private String videoUri = "";
private MediaProjectionManager mediaProjectionManager;
private MediaProjection mediaProjection;
private VirtualDisplay virtualDisplay;
private MediaRecorder mediaRecorder;
private int mScreenDensity;
private static int DISPLAY_WIDTH;
private static int DISPLAY_HEIGHT;
private int resultCode;
private Intent resultData;
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public void onCreate() {
super.onCreate();
Notification.Builder builder = new Notification.Builder(getApplicationContext(), "333")
.setContentTitle(getString(R.string.app_name))
.setContentText("Record")
.setAutoCancel(true);
Notification notification = builder.build();
startForeground(123, notification);
p = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
window = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics metrics = new DisplayMetrics();
window.getDefaultDisplay().getMetrics(metrics);
mScreenDensity = metrics.densityDpi;
DISPLAY_WIDTH = metrics.widthPixels;
DISPLAY_HEIGHT = metrics.heightPixels;
mediaRecorder = new MediaRecorder();
mediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent.getAction() == null) {
resultCode = intent.getIntExtra("code", 1337);
resultData = intent.getParcelableExtra("data");
}
onStartRecord();
return (START_NOT_STICKY);
}
@Override
public void onDestroy() {
onStopRecord();
super.onDestroy();
}
private void onStartRecord() {
mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, resultData);
int quality = p.getInt("quality", 1080);
boolean micro = p.getBoolean("micro", false);
int fps = p.getInt("FPS", 60);
initRecorder(quality, micro, fps);
virtualDisplay = createVirtualDisplay();
isRecord = true;
p.edit().putBoolean("isRecord", isRecord).apply();
mediaRecorder.start();
}
private void onStopRecord() {
mediaRecorder.stop();
mediaRecorder.reset();
stopRecordScreen();
isRecord = false;
p.edit().putBoolean("isRecord", isRecord).apply();
}
private VirtualDisplay createVirtualDisplay() {
return mediaProjection.createVirtualDisplay("MainFragment", DISPLAY_WIDTH, DISPLAY_HEIGHT, mScreenDensity,
DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
mediaRecorder.getSurface(), null, null);
}
private void initRecorder(int QUALITY, boolean isMicro, int fps) {
try {
int bitrateVideo = 0;
switch (QUALITY) {
case 1080:
bitrateVideo = 7000000;
break;
case 720:
bitrateVideo = 4000000;
break;
default:
bitrateVideo = 2000000;
break;
}
if (isMicro) {
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
}
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
if (isMicro) {
mediaRecorder.setAudioSamplingRate(44100);
mediaRecorder.setAudioEncodingBitRate(16 * 44100);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
}
videoUri = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)
+ new StringBuilder("/FreeRecord_").append(new SimpleDateFormat("dd-MM-yyyy-hh-mm-ss")
.format(new Date())).append(".mp4").toString();
mediaRecorder.setOutputFile(videoUri);
mediaRecorder.setVideoSize(DISPLAY_WIDTH, DISPLAY_HEIGHT);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
mediaRecorder.setVideoEncodingBitRate(bitrateVideo);
mediaRecorder.setCaptureRate(fps);
mediaRecorder.setVideoFrameRate(fps);
int rotation = window.getDefaultDisplay().getRotation();
int orientation = ORIENTATIONS.get(rotation + 90);
mediaRecorder.setOrientationHint(orientation);
mediaRecorder.prepare();
} catch (IOException e) {
e.printStackTrace();
}
}
private void stopRecordScreen() {
if (virtualDisplay == null) {
return;
}
virtualDisplay.release();
destroyMediaProject();
}
private void destroyMediaProject() {
if (mediaProjection != null) {
mediaProjection.stop();
mediaProjection = null;
}
}
}
【问题讨论】：