需求如下图 实现系统录屏功能 

frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord

涉及代码

ScreenRecordDialog # startBtn

RecordingService # startRecording# stopRecording

ScreenMediaRecorder # start # end  #save

1、点击开始录屏frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord/ScreenRecordDialog.java

 startBtn.setOnClickListener(v -> {
            if (mOnStartRecordingClicked != null) {
                // Note that it is important to run this callback before dismissing, so that the
                // callback can disable the dialog exit animation if it wants to.
                mOnStartRecordingClicked.run();
            }

            requestScreenCapture();
            dismiss();
        });

2、ScreenRecordDialog #requestScreenCapture核心代码实现功能 

private void requestScreenCapture() {
        Context userContext = mUserContextProvider.getUserContext();
        ScreenRecordingAudioSource audioMode = mAudioSwitch.isChecked()
                ? (ScreenRecordingAudioSource) mOptions.getSelectedItem()
                : NONE;
        PendingIntent startIntent = PendingIntent.getForegroundService(userContext,
                RecordingService.REQUEST_CODE,
                RecordingService.getStartIntent(
                        userContext, Activity.RESULT_OK,
                        audioMode.ordinal()),
                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
        PendingIntent stopIntent = PendingIntent.getService(userContext,
                RecordingService.REQUEST_CODE,
                RecordingService.getStopIntent(userContext),
                PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
        mController.startCountdown(DELAY_MS, INTERVAL_MS, startIntent, stopIntent);
    }
}

3、RecordingService 中实现开始录屏功能 代码如下图所示

 case ACTION_START:
                mAudioSource = ScreenRecordingAudioSource
                        .values()[intent.getIntExtra(EXTRA_AUDIO_SOURCE, 0)];
                Log.d(TAG, "recording with audio source" + mAudioSource);

                mRecorder = new ScreenMediaRecorder(
                        mUserContextTracker.getUserContext(),
                        currentUserId,
                        mAudioSource,
                        this
                );

                if (startRecording()) {
                    updateState(true);
                    createRecordingNotification();
                    mUiEventLogger.log(Events.ScreenRecordEvent.SCREEN_RECORD_START);
                } else {
                    updateState(false);
                    createErrorNotification();
                    stopForeground(true);
                    stopSelf();
                    return Service.START_NOT_STICKY;
                }
                break;

4、ScreenMediaRecorder 调用start方法开始录屏 

  * Start screen recording
    */
    void start() throws IOException, RemoteException, RuntimeException {
        Log.d(TAG, "start recording");
        prepare();
        mMediaRecorder.start();
        recordInternalAudio();
    }

5、ScreenMediaRecorder停止录屏 调用代码路径 

/**
     * End screen recording
     */
    void end() {
        mMediaRecorder.stop();
        mMediaRecorder.release();
        mInputSurface.release();
        mVirtualDisplay.release();
        mMediaProjection.stop();
        mMediaRecorder = null;
        mMediaProjection = null;
        stopInternalAudioRecording();

        Log.d(TAG, "end recording");
    }

6、保存录屏视频代码 如下图所示

/**
     * Store recorded video
     */
    protected SavedRecording save() throws IOException {
        String fileName = new SimpleDateFormat("'screen-'yyyyMMdd-HHmmss'.mp4'")
                .format(new Date());

        ContentValues values = new ContentValues();
        values.put(MediaStore.Video.Media.DISPLAY_NAME, fileName);
        values.put(MediaStore.Video.Media.MIME_TYPE, "video/mp4");
        values.put(MediaStore.Video.Media.DATE_ADDED, System.currentTimeMillis());
        values.put(MediaStore.Video.Media.DATE_TAKEN, System.currentTimeMillis());

        ContentResolver resolver = mContext.getContentResolver();
        Uri collectionUri = MediaStore.Video.Media.getContentUri(
                MediaStore.VOLUME_EXTERNAL_PRIMARY);
        Uri itemUri = resolver.insert(collectionUri, values);

        Log.d(TAG, itemUri.toString());
        if (mAudioSource == MIC_AND_INTERNAL || mAudioSource == INTERNAL) {
            try {
                Log.d(TAG, "muxing recording");
                File file = File.createTempFile("temp", ".mp4",
                        mContext.getCacheDir());
                mMuxer = new ScreenRecordingMuxer(MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4,
                        file.getAbsolutePath(),
                        mTempVideoFile.getAbsolutePath(),
                        mTempAudioFile.getAbsolutePath());
                mMuxer.mux();
                mTempVideoFile.delete();
                mTempVideoFile = file;
            } catch (IOException e) {
                Log.e(TAG, "muxing recording " + e.getMessage());
                e.printStackTrace();
            }
        }

        // Add to the mediastore
        OutputStream os = resolver.openOutputStream(itemUri, "w");
        Files.copy(mTempVideoFile.toPath(), os);
        os.close();
        if (mTempAudioFile != null) mTempAudioFile.delete();
        DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();
        Size size = new Size(metrics.widthPixels, metrics.heightPixels);
        SavedRecording recording = new SavedRecording(itemUri, mTempVideoFile, size);
        mTempVideoFile.delete();
        return recording;
    }

到这里基本结束了，转载请注明出处Android高通 12/13 录屏流程代码位置-CSDN博客，谢谢！