这是启动XML文件的主要活动：VideoCaptureActivity.java：
public class VideoCaptureActivity extends Activity
{
private static final String TAG = "VideoCaptureActivity";
Camera camera;
ImageButton recordButton;
ImageButton stopButton;enter code here
ImageButton back;
Button flash;
Button flashoff;
Button flip;
SeekBar sb;
FrameLayout cameraPreviewFrame;
CameraPreview cameraPreview;
MediaRecorder mediaRecorder;
private Spinner spinner1;
private Timer myTimer;
File file;
int currentZoomLevel = 0;
int maxZoomLevel = 0;
int MAX_ZOOM=15;
int fcamera =0;
Size temp;
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
super.setContentView(R.layout.video_capture);
// this.mediaRecorder = new MediaRecorder();
// this.mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
// this.mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
// this.mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
// this.mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
// this.mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
this.cameraPreviewFrame = (FrameLayout)super.findViewById(R.id.camera_preview);
this.recordButton = (ImageButton)super.findViewById(R.id.recordButton);
this.stopButton = (ImageButton)super.findViewById(R.id.stopButton);
spinner1 = (Spinner) findViewById(R.id.spinner1);
back =(ImageButton)findViewById(R.id.back);
this.flash=(Button)findViewById(R.id.flashon);
this.flashoff=(Button)findViewById(R.id.fashoff);
this.sb = (SeekBar) findViewById(R.id.seekBar1);
this.sb.setOnSeekBarChangeListener( new seekListener() );
this.toggleButtons(false);
// we'll enable this button once the camera is ready
this.recordButton.setEnabled(false);
// this.flash.setEnabled(false);
stopButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
stopRecording(v);
}
});
flash.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
flashLightOn(v );
}
});
flashoff.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
flashLightOff(v );
}
});
back.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//DatePicker dp = (DatePicker)findViewById(R.id.datePicker1);
Intent intent = new Intent(VideoCaptureActivity.this ,MainGrid.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
});
}
void toggleButtons(boolean recording) {
this.recordButton.setEnabled(!recording);
this.recordButton.setVisibility(recording ? View.GONE : View.VISIBLE);
this.stopButton.setEnabled(recording);
this.stopButton.setVisibility(recording ? View.VISIBLE : View.GONE);
}
public void flashLightOn(View view) {
// this.flash.setVisibility(View.INVISIBLE);
this.flash.setVisibility(View.INVISIBLE);
try {
if (getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA_FLASH)) {
// camera = Camera.open();
Parameters p = camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
// camera.startPreview();
}
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getBaseContext(), "Exception flashLightOn()",
Toast.LENGTH_SHORT).show();
}
}
public void flashLightOff(View view) {
// this.flash.setVisibility(View.VISIBLE);
this.flash.setVisibility(View.VISIBLE);
try {
if (getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA_FLASH)) {
Parameters p = camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
}
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getBaseContext(), "Exception flashLightOff",
Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onResume() {
super.onResume();
// initialize the camera in background, as this may take a while
// try {
// Camera camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
// sb.setMax(camera.getParameters().getMaxZoom());
// sb.setProgress(0);
// // Camera camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
//
// } catch (RuntimeException e) {
// Log.wtf(TAG, "Failed to get camera", e);
// }
// if (camera == null) {
// Toast.makeText(VideoCaptureActivity.this, R.string.cannot_record,
// Toast.LENGTH_SHORT).show();
// } else {
// VideoCaptureActivity.this.initCamera(camera);
// }
new AsyncTask<Void, Void, Camera>() {
@Override
protected Camera doInBackground(Void... params) {
try {
Camera camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
sb.setMax(camera.getParameters().getMaxZoom());
sb.setProgress(0);
// Camera camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
return camera == null ? Camera.open(0) : camera;
} catch (RuntimeException e) {
Log.wtf(TAG, "Failed to get camera", e);
return null;
}
}
@Override
protected void onPostExecute(Camera camera) {
if (camera == null) {
Toast.makeText(VideoCaptureActivity.this, R.string.cannot_record,
Toast.LENGTH_SHORT).show();
} else {
initCamera(camera);
}
}
}.execute();
}
void initCamera(Camera camera) {
// we now have the camera
Camera.Parameters params = camera.getParameters();
List<Size> previewSize = params.getSupportedPreviewSizes();
temp = previewSize.get(0);
// for (int i =0; i<previewSize.size(); i++)
// {
//
// }
this.camera = camera;
// create a preview for our camera
this.cameraPreview = new CameraPreview( VideoCaptureActivity.this,camera);
// add the preview to our preview frame
this.cameraPreviewFrame.addView(this.cameraPreview);
// enable just the record button
this.recordButton.setEnabled(true);
}
void releaseCamera() {
if (this.camera != null) {
// this.camera.lock(); // unnecessary in API >= 14
// //this.camera.stopPreview();
this.camera.release();
this.camera = null;
this.cameraPreviewFrame.removeView(this.cameraPreview);
}
}
void releaseMediaRecorder() {
if (this.mediaRecorder != null) {
this.mediaRecorder.reset(); // clear configuration (optional here)
this.mediaRecorder.release();
this.mediaRecorder = null;
}
}
void releaseResources() {
this.releaseMediaRecorder();
this.releaseCamera();
}
@Override
public void onPause() {
super.onPause();
this.releaseResources();
}
@Override
public void onStop()
{
super.onStop();
this.releaseCamera();
}
@Override
public void onDestroy()
{
super.onDestroy();
this.releaseCamera();
}
// gets called by the button press
public void startRecording(final View v) {
Log.d(TAG, "startRecording()");
// we need to unlock the camera so that mediaRecorder can use it\\
// this.camera.unlock(); // unnecessary in API >= 14
// now we can initialize the media recorder and set it up with our
// camera
this.camera.stopPreview();
this.camera.release();
this.mediaRecorder = new MediaRecorder();
// this.mediaRecorder.setCamera(this.camera);
this.mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
this.mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
//// this.mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
this.mediaRecorder.setProfile(CamcorderProfile.get(Camera.CameraInfo.CAMERA_FACING_BACK,
CamcorderProfile.QUALITY_HIGH));
// this.mediaRecorder.setVideoSize(320, 240);
// this.mediaRecorder.setVideoFrameRate(15);
// this.mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
// this.mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
// this.mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
// this.mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
// if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_1080P))
// this.mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_1080P));
// else
// if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_720P))
// this.mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_720P));
// else
// if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_480P))
// this.mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_480P));
this.mediaRecorder.setOutputFile(this.initFile().getAbsolutePath());
this.mediaRecorder.setPreviewDisplay(this.cameraPreview.getHolder().getSurface());
// mediaRecorder.setMaxDuration((int) 1800);
try {
//this.toggleButtons(true);
String sec=String.valueOf(spinner1.getSelectedItem()) ;
//int seconds =Integer.parseInt(sec);
String toast =String.valueOf(spinner1.getSelectedItem()) +" Recording";
Toast.makeText(this, toast, Toast.LENGTH_SHORT).show();
if(sec.equals("1")){
this.recordButton.setVisibility(View.INVISIBLE);
this.mediaRecorder.setMaxDuration(1000);
this.mediaRecorder.prepare();
// start the actual recording
// throws IllegalStateException if not prepared
this.mediaRecorder.start();
// this.recordButton.setVisibility(View.VISIBLE);
this.recordButton.setVisibility(View.VISIBLE);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
stopRecording(v);
}
},1000);
}
else if(sec.equals("2")){
this.recordButton.setVisibility(View.INVISIBLE);
this.mediaRecorder.setMaxDuration(2000);
this.mediaRecorder.prepare();
// start the actual recording
// throws IllegalStateException if not prepared
this.mediaRecorder.start();
// this.recordButton.setVisibility(View.VISIBLE);
this.recordButton.setVisibility(View.VISIBLE);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
stopRecording(v);
}
},2000);
}
else{
//this.mediaRecorder.setMaxDuration(5000);
this.toggleButtons(true);
this.mediaRecorder.prepare();
//start the actual recording
// throws IllegalStateException if not prepared
this.mediaRecorder.start();
// stopRecording(v);
// enable the stop button by indicating that we are recording
}
} catch (Exception e) {
Log.wtf(TAG, "Failed to prepare MediaRecorder", e);
Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
this.releaseResources();
}
}
// gets called by the button press
public void stopRecording(View v) {
Log.d(TAG, "stopRecording()");
assert this.mediaRecorder != null;
try {
this.mediaRecorder.stop();
Toast.makeText(this, R.string.saved, Toast.LENGTH_SHORT).show();
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
// we are no longer recording
this.toggleButtons(false);
} catch (RuntimeException e) {
// the recording did not succeed
Log.w(TAG, "Failed to record", e);
if (this.file != null && this.file.exists() && this.file.delete()) {
Log.d(TAG, "Deleted " + this.file.getAbsolutePath());
}
return;
} finally {
this.releaseMediaRecorder();
}
if (this.file == null || !this.file.exists()) {
Log.w(TAG, "File does not exist after stop: " + this.file.getAbsolutePath());
} else {
Log.d(TAG, "Going to display the video: " + this.file.getAbsolutePath());
Intent intent = new Intent(this, VideoPlaybackActivity.class);
intent.setData(Uri.fromFile(file));
super.startActivity(intent);
}
}
private File initFile() {
File dir = new File(
Environment.getExternalStorageDirectory().toString() +
Utils.OUR_TEMP_FOLDER);
if (!dir.exists() && !dir.mkdirs()) {
Log.wtf(TAG, "Failed to create storage directory: " + dir.getAbsolutePath());
Toast.makeText(VideoCaptureActivity.this, R.string.cannot_record, Toast.LENGTH_SHORT).show();
this.file = null;
} else {
this.file = new File(dir.getAbsolutePath(), new SimpleDateFormat(
"yyyyMMddHHmmss'.mp4'").format(new Date()));
}
return this.file;
}
private class seekListener implements SeekBar.OnSeekBarChangeListener
{
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
if (fromUser == true)
{
Parameters p = camera.getParameters();
p.setZoom(progress);
camera.setParameters(p);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
}
}
我的相机预览如下
CameraPreview.java:
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "CameraPreview";
private final Camera camera;
@SuppressWarnings("deprecation")
public CameraPreview(Context context, Camera camera) {
super(context);
Camera.Parameters params = camera.getParameters();
List<String> focusModes = params.getSupportedFocusModes();
if (focusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO))
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
else
if (focusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO))
params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
camera.setParameters(params);
this.camera = camera;
super.getHolder().addCallback(this);
// required for API <= 11
super.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG, "surfaceCreated()");
// now that we have the surface, we can start the preview
try {
this.camera.setPreviewDisplay(holder);
this.camera.startPreview();
} catch (IOException e) {
Log.wtf(TAG, "Failed to start camera preview", e);
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// we will release the camera preview in our activity before this
// happens
Log.d(TAG, "surfaceDestroyed()");
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// our activity runs with screenOrientation="landscape" so we don't
// care about surface changes
Parameters params = camera.getParameters();
Log.d(TAG, "surfaceChanged()");
}
}
我不知道出了什么问题相机工作正常但是UI在开始时是可见的但是在一段时间后看不见但是预览仍然存在，如果我点击不可见的按钮就可以工作。所以控制工作但是看不到