我正在尝试进行应用程序，当我们将短信发送到手机时，相机将自动开启视频模式，它将开始视频录制。当移动设备未处于休眠模式时，应用程序正常工作。但问题是如果移动设备处于休眠模式，则视频录制无法正常工作，并且会在mMediaRecorder.prepare();处停止执行。这是我用来接收短信的代码：
public void onReceive(final Context context, Intent intent) {
// TODO Auto-generated method stub
final Bundle bundle = intent.getExtras();
pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP|PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "My tag");
wl.acquire();
Thread timer = new Thread()
{
public void run()
{
try {
if(bundle != null)
{
Object[] pdus = (Object[]) bundle.get("pdus");
SmsMessage[] msg = new SmsMessage[pdus.length];
for(int i = 0; i <msg.length; i++)
{
msg[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
incomingMsg = msg[i].getMessageBody().toString();
}
}
System.out.println("incomingMsg :"+incomingMsg);
if(incomingMsg.length() > 0 && incomingMsg.trim().contains("start") )
{
System.out.println("starting activity");
Intent in =new Intent(context, CameraRecorderActivity.class);
in.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(in);
}
else if(incomingMsg.length() > 0 && incomingMsg.trim().contains("stop"))
{
System.out.println("sending broadcast");
Intent in =new Intent(SMS_RECEIVE);
// in.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
in.putExtra("key", "stop");
context.sendBroadcast(in);
}
sleep(100);
} catch (InterruptedException e) {
// TODO: handle exception
}finally{
// wl.release();
}
}
}; timer.start();
}
此代码我习惯于录制视频，//这里我正在解决问题
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Create an instance of Camera.
KeyguardManager manager = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
KeyguardLock lock = manager.newKeyguardLock(KEYGUARD_SERVICE);
lock.disableKeyguard();
mCamera = getCameraInstance();
// Create preview view and set it as the content of our activity.
mPreview = new CameraPreview(this, mCamera);
int i = R.id.videoview;
Object o = this.findViewById(i);
FrameLayout preview = (FrameLayout) o;
preview.addView(mPreview);
System.out.println("before run method.."+mCamera);
new Handler().postDelayed(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("in run method.."+mCamera);
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
System.out.println("media recorder before start...");
mMediaRecorder.start();
System.out.println("media recorder start...");
// inform the user that recording has started
setCaptureButtonText("Stop");
isRecording = true;
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
}, 10000);
mHandleMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String task = intent.getExtras().getString("key");
System.out.println("receiving broadcast :"+task);
if(task.equals("stop"))
{
if (isRecording) {
// unregisterReceiver(mHandleMessageReceiver);
// 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;
finish();
} else {
// initialize video camera
if (prepareVideoRecorder()) {
// Camera is available and unlocked, MediaRecorder is prepared,
// now you can start recording
mMediaRecorder.start();
// inform the user that recording has started
setCaptureButtonText("Stop");
isRecording = true;
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
}
};
registerReceiver(mHandleMessageReceiver,new IntentFilter(SMS_RECEIVE));
// Add a listener to the Capture button
captureButton = (Button) findViewById(R.id.mybutton);
captureButton.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(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
mMediaRecorder.start();
// inform the user that recording has started
setCaptureButtonText("Stop");
isRecording = true;
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
}
);
}
public void setCaptureButtonText(String s) {
captureButton.setText(s);
}
@Override
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(TAG, "Error setting camera preview: " + e.getMessage());
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
// File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyCameraApp");
File rootDir = Environment.getExternalStorageDirectory();
File path = new File(rootDir.getAbsolutePath(),"/Srinivas/");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! path.exists()){
if (! path.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_IMAGE){
mediaFile = new File(path + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(path.getPath() + File.separator +
"VID_"+ timeStamp + ".3gp");
} else {
return null;
}
System.out.println("mediaFile :"+mediaFile);
return mediaFile;
}
private boolean prepareVideoRecorder(){
try {
//mCamera = getCameraInstance();
mMediaRecorder = new MediaRecorder();
mCamera.stopPreview() ;
// 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);
// mMediaRecorder.setVideoSize(240, 240);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));
// Step 4: Set output file
mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());
System.out.println("1");
// Step 5: Set the preview output
mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
// Step 6: Prepare configured MediaRecorder
System.out.println("2");
mMediaRecorder.prepare();
System.out.println("3");
} catch (IllegalStateException e) {
Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage());
e.printStackTrace();
releaseMediaRecorder();
return false;
} catch (IOException e) {
Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
e.printStackTrace();
releaseMediaRecorder();
return false;
} catch(Exception e)
{
e.printStackTrace();
}
return true;
}
答案 0 :(得分：0)
这是设计的。相机无法在睡眠设备中使用。如果您的应用程序在传入的短信中醒来，您可以启动“活动”，它将打开屏幕。
为此，Activity.onCreate()应设置以下标志：
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);