public class FulfillVideoTaskActivity extends Activity implements SurfaceHolder.Callback, OnInfoListener, OnErrorListener{
private Button initBtn = null;
private Button startBtn = null;
private Button stopBtn = null;
private Button playBtn = null;
private Button stopPlayBtn = null;
// save Button should be implemented
private TextView recordingMsg = null;
private VideoView videoView = null;
private SurfaceHolder holder = null;
private Camera camera = null;
private static final String TAG ="RecordVideo";
private MediaRecorder recorder = null;
private String outputFileName;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fulfill_video_task);
// get references to UI elements
initBtn = (Button) findViewById(R.id.initBtn);
startBtn = (Button) findViewById(R.id.startBtn);
stopBtn = (Button) findViewById(R.id.stopBtn);
playBtn = (Button) findViewById(R.id.playBtn);
stopPlayBtn = (Button) findViewById(R.id.stopPlayBtn);
recordingMsg = (TextView) findViewById(R.id.recording);
videoView = (VideoView)this.findViewById(R.id.videoView);
}
public void buttonTapped(View view) {
switch(view.getId()) {
case R.id.initBtn:
initRecorder();
break;
case R.id.startBtn:
beginRecording();
break;
case R.id.stopBtn:
stopRecording();
break;
case R.id.playBtn:
playRecording();
break;
case R.id.stopPlayBtn:
stopPlayback();
break;
}
}
private void stopPlayback() {
videoView.stopPlayback();
}
private void playRecording() {
MediaController mc = new MediaController(this);
videoView.setMediaController(mc);
videoView.setVideoPath(outputFileName);
videoView.start();
stopPlayBtn.setEnabled(true);
}
private void stopRecording() {
if(recorder != null) {
recorder.setOnErrorListener(null);
recorder.setOnInfoListener(null);
try {
recorder.stop();
}
catch(IllegalStateException e) {
//this can happen if the recorder has already stopped.
Log.e(TAG, "Got IllegalStateException in stopRecording");
}
releaseRecorder();
recordingMsg.setText("");
releaseCamera();
startBtn.setEnabled(false);
stopBtn.setEnabled(false);
playBtn.setEnabled(true);
}
}
private void releaseCamera() {
if(camera != null) {
try {
camera.reconnect();
} catch (IOException e) {
e.printStackTrace();
}
camera.release();
camera = null;
}
}
private void releaseRecorder() {
if(recorder != null) {
recorder.release();
recorder = null;
}
}
private void beginRecording() {
recorder.setOnInfoListener(this);
recorder.setOnErrorListener(this);
recorder.start();
recordingMsg.setText("RECORDING");
startBtn.setEnabled(false);
stopBtn.setEnabled(true);
}
// Initialize the recorder
private void initRecorder() {
if(recorder != null) return;
// The place where the video will be saved.
outputFileName = Environment.getExternalStorageDirectory() + "/videooutput.mp4";
File outFile = new File(outputFileName);
//if File already exists, we delete it
if(outFile.exists())
outFile.delete();
try{
camera.stopPreview();
camera.unlock();
recorder = new MediaRecorder();
recorder.setCamera(camera);
recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
recorder.setVideoSize(280, 200);
recorder.setVideoFrameRate(15);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setMaxDuration(10000); // limit to 10 seconds
recorder.setPreviewDisplay(holder.getSurface());
recorder.setOutputFile(outputFileName); // setting our output file to our FileName
recorder.prepare();
Log.v(TAG, "MediaRecorder initialized");
initBtn.setEnabled(false);
startBtn.setEnabled(true);
}
//error checking
catch(Exception e) {
Log.v(TAG, "MediaRecorder failed to initialize");
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_fulfill_video_task, menu);
return true;
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
Log.v(TAG, "in sufaceCreated");
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
}catch (IOException e) {
Log.v(TAG, "Could not start the preview");
e.printStackTrace();
}
initBtn.setEnabled(true);
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
public void onError(MediaRecorder mr, int what, int extra) {
Log.e(TAG, "got a recording error");
stopRecording();
Toast.makeText(this, "Recording error has occurred. Stopping the recording", Toast.LENGTH_SHORT).show();
}
public void onInfo(MediaRecorder mr, int what, int extra) {
Log.i(TAG, "got a recording event");
if(what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {
Log.i(TAG, "...max duration reached");
stopRecording();
Toast.makeText(this, "Recording limit has been reached. Stopping the recording", Toast.LENGTH_SHORT).show();
}
}
// disable the buttons until the camera is initialized
protected void onResume() {
Log.v(TAG, "in onResume");
super.onResume();
initBtn.setEnabled(false);
startBtn.setEnabled(false);
stopBtn.setEnabled(false);
playBtn.setEnabled(false);
stopPlayBtn.setEnabled(false);
if(!initCamera())
finish();
}
// initializes the camera
private boolean initCamera() {
try {
camera = Camera.open();
Camera.Parameters camParams = camera.getParameters();
camera.lock();
holder = videoView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
catch(RuntimeException re) {
Log.v(TAG, "Could not initialize the Camera");
re.printStackTrace();
return false;
}
return true;
}
}
嗨，我正在尝试在Android上录制视频，当我运行我的代码（上面的整个代码）时，相机无法初始化。我猜我在下面的部分中有错误。
private boolean initCamera() {
try {
camera = Camera.open();
Camera.Parameters camParams = camera.getParameters();
camera.lock();
holder = videoView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
catch(RuntimeException re) {
Log.v(TAG, "Could not initialize the Camera");
re.printStackTrace();
return false;
}
return true;
}
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);此代码中的这一行有多个标记，说
setType(int) SURFACE_TYPE_PUSH_BUFFERS 有谁知道我为什么会这样做？
答案 0 :(得分：3)
试试此代码
首先
setRecorder() ;
SurfaceView videoShootSurfaceView = (SurfaceView) findViewById(R.id.shootVideosurfaceView_VSD);
SurfaceHolder videoSurfaceHolder = videoShootSurfaceView.getHolder();
videoSurfaceHolder.addCallback(this);
videoSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
设置录像机类型
public void setRecorder() {
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
// recorder.setVideoSize(640, 480);
recorder.setVideoSize(320, 240);
// recorder.setVideoSize(480, 320);
// recorder.setVideoSize(176, 144);
recorder.setVideoFrameRate(15);
// recorder.setMaxDuration(3600000);
recorder.setMaxDuration(300000);
recorder.setOutputFile("/sdcard/videocapture_example.mp4");
}
覆盖这个方法。
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
recorder.setPreviewDisplay(holder.getSurface());
if (recorder != null) {
try {
recorder.prepare();
} catch (IllegalStateException e) {
Log.e("IllegalStateException", e.toString());
} catch (IOException e) {
Log.e("IOException", e.toString());
}
}
}
开始录制
public void startRecording() {
setRecorder();
recorder.setPreviewDisplay(recoderTempHolder.getSurface());
if (recorder != null) {
try {
recorder.prepare();
recorder.start();
} catch (IllegalStateException e) {
Log.e("IllegalStateException", e.toString());
} catch (IOException e) {
Log.e("IOException", e.toString());
}
}
}
停止录制
public void stopRecording() {
recorder.stop();
// recorder.reset();
recorder.release();
}