一、申请权限

<uses-permission android:name="android.permission.RECORD_AUDIO" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

public static void checkPermission(AppCompatActivity activity) { if (Build.VERSION.SDK_INT >= 23) { int checkPermission = ContextCompat.checkSelfPermission(activity, Manifest.permission.RECORD_AUDIO) + ContextCompat.checkSelfPermission(activity, Manifest.permission.READ_PHONE_STATE) + ContextCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE) + ContextCompat.checkSelfPermission(activity, Manifest.permission.READ_EXTERNAL_STORAGE); if (checkPermission != PackageManager.PERMISSION_GRANTED) { //动态申请 ActivityCompat.requestPermissions(activity, new String[]{ Manifest.permission.RECORD_AUDIO, Manifest.permission.READ_PHONE_STATE, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 123); return; } else { return; } } return; } 

二、适配Android Q

开始之前首先适配Android Q，对于Android Q，直接startService会抛出如下异常，因此，首先得适配AndroidQ：

Media projections require a foreground service of type ServiceInfo.FOREGROUN

1、配置前台服务权限

<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

2、添加服务节点

 <service android:name=".server.RecordService" //RecordService为录音的服务。 android:enabled="true" android:exported="true" tools:targetApi="q" android:foregroundServiceType="mediaProjection" />

3、启动服务

context.startForegroundService(intent);

4、配置通知栏

 Notification.Builder builder = new Notification.Builder(this) .setContentTitle(getString(R.string.app_name)) .setContentText("正在录制屏幕内容...") .setSmallIcon(R.mipmap.ic_launcher); NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { NotificationChannel channel = new NotificationChannel(appId, getResources().getString(R.string.app_name), NotificationManager.IMPORTANCE_HIGH); notificationManager.createNotificationChannel(channel); builder.setChannelId(appId); } startForeground(1, builder.build());

三、获取用户录制屏幕授权

MediaProjectionManager , MediaProjectionManager 是系统提供的一种服务，当我们拿到这个服务对象，可以创建一个 Intent ，通过这个 Intent 可以启动一个弹框样式的 Activity,如果用户授权了，那我们便可以继续下一步屏幕录制。

 public void start(){ projectionManager = (MediaProjectionManager) activity.getSystemService(Context.MEDIA_PROJECTION_SERVICE); Intent captureIntent = projectionManager.createScreenCaptureIntent(); activity.startActivityForResult(captureIntent,REQUEST_SYSTEM_RECORD_SCREEN); }

四、在 onActivityResult 对用户的授权做处理

 public static void onActivityResult(Context context, Intent data) { if (data != null) { Intent intent = new Intent(context, MediaRecordService.class); intent.putExtra("code", Activity.RESULT_OK); intent.putExtra("data", data); intent.putExtra("path", path); intent.putExtra("width", width); intent.putExtra("height", height); intent.putExtra("bit", bit); intent.putExtra("fps", fps); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { context.startForegroundService(intent); } else { context.startService(intent); } context.bindService(intent, new RecordServiceConn(), Context.BIND_AUTO_CREATE); } }

五、创建RecordService服务，开启录音

 @Override public int onStartCommand(Intent intent, int flags, int startId) { Notification.Builder builder = new Notification.Builder(this) .setContentTitle(getString(R.string.app_name)) .setContentText("正在录制屏幕内容...") .setSmallIcon(R.mipmap.ic_launcher); NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { NotificationChannel channel = new NotificationChannel(appId(), getResources().getString(R.string.app_name), NotificationManager.IMPORTANCE_HIGH); notificationManager.createNotificationChannel(channel); builder.setChannelId(appId); } startForeground(1, builder.build()); if (intent != null) { outPath = intent.getStringExtra("path"); width = intent.getIntExtra("width", 720); height = intent.getIntExtra("height", 1080); bit = intent.getIntExtra("bit", 1000); fps = intent.getIntExtra("fps", 24); int code = intent.getIntExtra("code", -1); Intent data = intent.getParcelableExtra("data"); mediaProjection = createMediaProjection(code, data); mediaRecorder = createMediaRecorder(); // 必须在mediaRecorder.prepare() 之后调用，否则报错"fail to get surface" virtualDisplay = createVirtualDisplay(); mediaRecorder.start(); } return Service.START_NOT_STICKY; }

 private MediaRecorder createMediaRecorder() { MediaRecorder mediaRecorder = new MediaRecorder(); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mediaRecorder.setOutputFile(outPath); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); mediaRecorder.setVideoSize(width, height); mediaRecorder.setVideoFrameRate(fps); mediaRecorder.setVideoEncodingBitRate(bit); try { mediaRecorder.prepare(); } catch (Exception e) { e.printStackTrace(); } return mediaRecorder; } private MediaProjection createMediaProjection(int resultCode, Intent intent) { return ((MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE)).getMediaProjection(resultCode, intent); } private VirtualDisplay createVirtualDisplay() { ImageReader imageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 2); imageReader.setOnImageAvailableListener(imageAvailableListener, null); return mediaProjection.createVirtualDisplay(TAG, width, height, densityDpi(), DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mediaRecorder.getSurface(), null, null); }

setVideoSize设置的宽高数值必须要和摄像头支持的数值相匹配，否则报错"fail to get surface"，另外上面会存在多个地方设置width、height，如果设置的不一样，图像会错位，和录制的原始画面不一致。

六、获取录制视频帧

在createVirtualDisplay方法中有设置setOnImageAvailableListener，这里可以监听视频帧，获取bitmap，如果需要的话：

 ImageReader.OnImageAvailableListener imageAvailableListener = new ImageReader.OnImageAvailableListener() { @Override public void onImageAvailable(ImageReader reader) { Image image = reader.acquireLatestImage(); if (image != null) { int width = image.getWidth(); int height = image.getHeight(); final Image.Plane[] planes = image.getPlanes(); final ByteBuffer buffer = planes[0].getBuffer(); int pixelStride = planes[0].getPixelStride(); int rowStride = planes[0].getRowStride(); int rowPadding = rowStride - pixelStride * width; Bitmap mBitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888); mBitmap.copyPixelsFromBuffer(buffer); image.close(); } } };

七、结束录制

 public void stop() { if (mediaRecorder != null) { mediaRecorder.stop(); release(); stopForeground(true); stopSelf(); } } 

 public void release() { if (virtualDisplay != null) { virtualDisplay.release(); virtualDisplay = null; } if (mediaRecorder != null) { mediaRecorder.setOnErrorListener(null); mediaProjection.stop(); mediaRecorder.reset(); mediaRecorder.release(); } if (mediaProjection != null) { mediaProjection.stop(); mediaProjection = null; } }

录制视频结束时候一定要 mediaRecorder.stop();如果直接退出APP或者杀死进程，录制的视频则无法播放。