我想点击lyt时开始从相机录制视频，再次点击它时停止录制。这段代码使＆＃34; myVideo.mp4＆＃34;文件，但它不能播放。 我也不想展示任何预览。 任何人都可以帮助我吗？
活动主要：
public class ActivityMain extends Activity {
MediaRecorder rec;
static Camera camera;
boolean isRecording = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout lyt = (LinearLayout) findViewById(R.id.lyt);
rec = new MediaRecorder();
lyt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if (isRecording) {
// stop recording and release camera
Log.e("TEST", "befor stop");
rec.stop(); // stop the recording
Log.e("TEST", "stop");
releaseMediaRecorder(); // release the MediaRecorder object
camera.lock(); // take camera access back from MediaRecorder
// inform the user that recording has stopped
isRecording = false;
} else {
// initialize video camera
if (prepareVideoRecorder()) {
// Camera is available and unlocked, MediaRecorder is prepared,
// now you can start recording
Log.e("TEST", "befor start");
rec.start();
Log.e("TEST", "start");
// inform the user that recording has started
isRecording = true;
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
});
// Intent intent = new Intent(ActivityMain.this, VideoCapture.class);
// startActivity(intent);
}
private void releaseMediaRecorder() {
if (rec != null) {
// rec.reset(); // clear recorder configuration
rec.release(); // release the recorder object
rec = null;
camera.lock(); // lock camera for later use
Log.e("TEST", "released");
}
}
/** A safe way to get an instance of the Camera object. */
public static Camera getCameraInstance() {
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e) {
Log.e("TEST", "Camera is not avalable : " + e);
}
return c; // returns null if camera is unavailable
}
private boolean prepareVideoRecorder() {
camera = getCameraInstance();
rec = new MediaRecorder();
// Step 1: Unlock and set camera to MediaRecorder
camera.unlock();
rec.setCamera(camera);
// Step 2: Set sources
rec.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
rec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
rec.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
// Step 4: Set output file
rec.setOutputFile(Environment.getExternalStorageDirectory().getAbsolutePath().toString() + "/" + "myVideo.mp4");
// Step 6: Prepare configured MediaRecorder
try {
rec.prepare();
}
catch (IllegalStateException e) {
Log.e("TEST", "IllegalStateException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
}
catch (IOException e) {
Log.e("TEST", "IOException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
}
return true;
}
}
答案 0 :(得分：1)
试试这段代码。它工作正常。正在显示预览，但您无法看到它。如果你找到教程如何录制没有活动的视频，请发布在这里。我正试图这样做。
的Manifest.xml
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.CAPTURE_VIDEO_OUTPUT"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<activity
android:name=".CameraActivity"
android:screenOrientation="landscape">
<intent-filter>
<category android:name="android.intent.category.LAUNCHER"/>
<action android:name="android.intent.action.MAIN"/>
</intent-filter>
</activity>
CameraActivity.java
public class CameraActivity extends Activity {
public static final int MEDIA_TYPE_VIDEO = 2;
private boolean isRecording = false;
private Camera mCamera;
private SurfaceView mPreview;
private MediaRecorder mMediaRecorder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
// Create an instance of Camera
mCamera = getCameraInstance();
// Create our Preview view and set it as the content of our activity.
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
}
public void onLinearClick(View v) {
if (isRecording) {
// stop recording and release camera
mMediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
mCamera.lock(); // take camera access back from MediaRecorder
// inform the user that recording has stopped
// setCaptureButtonText("Capture");
isRecording = false;
} else {
// initialize video camera
if (prepareVideoRecorder()) {
// Camera is available and unlocked, MediaRecorder is prepared,
// now you can start recording
try {
mMediaRecorder.start();
// inform the user that recording has started
// setCaptureButtonText("Stop");
isRecording = true;
} catch (IllegalStateException e) {
e.printStackTrace();
}
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
@Override
protected void onPause() {
super.onPause();
releaseMediaRecorder(); // if you are using MediaRecorder, release it first
releaseCamera(); // release the camera immediately on pause event
}
private void releaseMediaRecorder(){
if (mMediaRecorder != null) {
mMediaRecorder.reset(); // clear recorder configuration
mMediaRecorder.release(); // release the recorder object
mMediaRecorder = null;
mCamera.lock(); // lock camera for later use
}
}
private void releaseCamera(){
if (mCamera != null){
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type){
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyCameraApp");
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"VID_"+ timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
private boolean prepareVideoRecorder(){
mMediaRecorder = new MediaRecorder();
// Step 1: Unlock and set camera to MediaRecorder
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
// Step 2: Set sources
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
// Step 4: Set output file
mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());
// Step 5: Set the preview output
mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
// Step 6: Prepare configured MediaRecorder
try {
mMediaRecorder.prepare();
} catch (IllegalStateException e) {
Log.d("", "IllegalStateException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
} catch (IOException e) {
Log.d("", "IOException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
}
return true;
}
private static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open();
} catch (Exception e){
e.printStackTrace();
// Camera is not available (in use or does not exist)
}return c; // returns null if camera is unavailable
}
/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d("", "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// empty. Take care of releasing the Camera preview in your activity.
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d("", "Error starting camera preview: " + e.getMessage());
}
}
}
}
activity_camera.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:onClick="onLinearClick">
<FrameLayout
android:id="@+id/camera_preview"
android:layout_width="1dp"
android:layout_height="1dp"/>
</LinearLayout>