7.使用MediaRecorder录制视频文件_使用mediarecorder录像demo

使用MediaRecorder录制视频文件

Android 模拟器无法录制音频。

生命周期

首先需要通过ActivityCompat.requestPermissions()来赋予赋予两个权限：

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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使用MediaRecorder录制音频的步骤通常如下：

 MediaRecorder recorder = new MediaRecorder();
 recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
 recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
 recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
 recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
 recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
 recorder.setOutputFile(PATH_NAME);
 recorder.prepare();
 recorder.start();   // Recording is now started
 ...
 recorder.stop();
 recorder.reset();   // You can reuse the object by going back to setAudioSource() step
 recorder.release(); // Now the object cannot be reused
// 记得释放摄像头的资源
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Code

Android MediaRecorder录制视频详细步骤_APDL_10的博客-CSDN博客

GitHub - android/media-samples at master

这个里面有很多demo例子

其中这些代码的书写方式真的很有意思，给人的感觉很好，值得学习。

点击录制按钮后，根据当前状态判断进入录制状态还是结束录制

因为录制需要先prepare，再start，所以提先去prepare子方法中进入相关的初始化配置，之后根据prepare的返回值来决定是否start（这两个步骤是通过async来执行）

如果进入结束就释放资源。

在设置音频和视频的编码器、输出格式、比特率等一系列参数其实可以采用setProfile的方法来设置，不用一个个来设置。

public class MediaRecorderActivity extends AppCompatActivity {
    private static final String TAG = "MediaRecorderActivity";

    private Camera mCamera;
    private SurfaceView mPreview;
    private MediaRecorder mMediaRecorder;
    private File mOutputFile;

    private boolean isRecording = false;
    private Button captureButton;

    public static Intent newIntent(Context packageContext) {
        Intent intent = new Intent(packageContext, MediaRecorderActivity.class);
        return intent;
}

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_media_recorder);

        mPreview = findViewById(R.id.afv_media_recorder);
        captureButton = findViewById(R.id.btn_media_recorder_capture);
    }

    /**
     * The capture button controls all user interaction. When recording, the button click
     * stops recording, releases {@link android.media.MediaRecorder} and
     * {@link android.hardware.Camera}. When not recording, it prepares the
     * {@link android.media.MediaRecorder} and starts recording.
     *
     * @param view the view generating the event.
     */
    public void onCaptureClick(View view) {
        if (isRecording) {
            // BEGIN_INCLUDE(stop_release_media_recorder)

            // stop recording and release camera
            try {
                mMediaRecorder.stop();  // stop the recording
            } catch (RuntimeException e) {
                // RuntimeException is thrown when stop() is called immediately after start().
                // In this case the output file is not properly constructed ans should be deleted.
            Log.d(TAG, "RuntimeException: stop() is called immediately after start()");
            //noinspection ResultOfMethodCallIgnored
            mOutputFile.delete();
            }
            releaseMediaRecorder(); // release the MediaRecorder object
            mCamera.lock();         // take camera access back from MediaRecorder

            // inform the user that recording has stopped
            setCaptureButtonText("Capture");
            isRecording = false;
            releaseCamera();
            // END_INCLUDE(stop_release_media_recorder)

        } else {

            // BEGIN_INCLUDE(prepare_start_media_recorder)

            new MediaPrepareTask().execute(null, null, null);

            // END_INCLUDE(prepare_start_media_recorder)

        }
    }

    private void setCaptureButtonText(String title) {
        captureButton.setText(title);
    }

    @Override
    protected void onPause() {
        super.onPause();
        // if we are using MediaRecorder, release it first
        releaseMediaRecorder();
        // release the camera immediately on pause event
        releaseCamera();
    }

    private void releaseMediaRecorder() {
        if (mMediaRecorder != null) {
            // clear recorder configuration
            mMediaRecorder.reset();
            // release the recorder object
            mMediaRecorder.release();
            mMediaRecorder = null;
            // Lock camera for later use i.e taking it back from MediaRecorder.
            // MediaRecorder doesn't need it anymore and we will release it if the activity pauses.
            mCamera.lock();
        }
    }

    private void releaseCamera() {
        if (mCamera != null) {
            // release the camera for other applications
            mCamera.release();
            mCamera = null;
        }
    }

    private boolean prepareVideoRecorder() {

        //1.创建recorder对象
        mMediaRecorder = new MediaRecorder();
        //2.设置录制视频的方向
        mCamera = Camera.open();//摄像头对象
        mCamera.setDisplayOrientation(90);//将摄像头预览的角度进行调整
        mCamera.unlock();
        mMediaRecorder.setCamera(mCamera);
        //3.设置音频源（MIC：麦克风采集音频）
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        //4.设置视频源（CAMERA：摄像头采集视频）
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        //5.设置视频输出格式（MP4）
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        //6.设置音频编码格式
        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        //7.设置视频编码格式
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
        //8.设置视频播放的方向
        mMediaRecorder.setOrientationHint(90);
        //9.设置输出文件的位置

        // Step 4: Set output file
        mOutputFile = CameraHelper.getOutputMediaFile(CameraHelper.MEDIA_TYPE_VIDEO);
        if (mOutputFile == null) {
            return false;
        }
        mMediaRecorder.setOutputFile(mOutputFile.getPath());
        // END_INCLUDE (configure_media_recorder)

        //10.设置输出视频的大小
        mMediaRecorder.setVideoSize(640,480);
        //11.设置视频的帧率
        mMediaRecorder.setVideoFrameRate(30);
        //12.设置预览界面（设置一个Surface，也就是预览的页面，然后交给）
        mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());

        // Step 5: Prepare configured MediaRecorder
        try {
            mMediaRecorder.prepare();
        } catch (IllegalStateException e) {
            Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
            return false;
        } catch (IOException e) {
            Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
            return false;
        }
        return true;
    }

    /**
     * Asynchronous task for preparing the {@link android.media.MediaRecorder} since it's a long blocking
     * operation.
     */
    class MediaPrepareTask extends AsyncTask<Void, Void, Boolean> {

        @Override
        protected Boolean doInBackground(Void... voids) {
            // initialize video camera
            if (prepareVideoRecorder()) {
                // Camera is available and unlocked, MediaRecorder is prepared,
                // now you can start recording
                mMediaRecorder.start();

                isRecording = true;
            } else {
                // prepare didn't work, release the camera
                releaseMediaRecorder();
                return false;
            }
            return true;
        }

        @Override
        protected void onPostExecute(Boolean result) {
            if (!result) {
                MediaRecorderActivity.this.finish();
            }
            // inform the user that recording has started
            setCaptureButtonText("Stop");
        }
    }
}
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