问题
I have integrated camera which allows user to record time lapse videos.When the user is recording a video a cancel button is there which allows user to cancel the current recording.My issue is that if after cancelling i try to record again i get the following exception-
java.lang.NullPointerException: Attempt to read from field 'int android.media.CamcorderProfile.fileFormat' on a null object reference
at android.media.MediaRecorder.setProfile(MediaRecorder.java:423)
at xyz.fragments.CameraFragment.prepareFastVideoRecorder(CameraFragment.java:448)
at xyz.fragments.CameraFragment.access$2300(CameraFragment.java:64)
at xyz.fragments.CameraFragment$6.onClick(CameraFragment.java:329)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19761)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5253)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
on line
mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_TIME_LAPSE_480P));
Below is my code-
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (prepareFastVideoRecorder()) {
mMediaRecorder.start();
} else {
releaseMediaRecorder();
}
}
}
}
});
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mMediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
mCamera.lock(); // take camera access back from
}
}):
private boolean prepareFastVideoRecorder() {
mMediaRecorder = new MediaRecorder();
try {
mCamera.setPreviewDisplay(null);
} catch (java.io.IOException ioe) {
Log.e("Bhuvnesh", "IOException nullifying preview display: " + ioe.getMessage());
}
mCamera.stopPreview();
// Step 1: Unlock and set camera to MediaRecorder
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
// Step 2: Set sources
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_TIME_LAPSE_480P));
//mMediaRecorder.setCaptureRate(0.1); // capture a frame every 10 seconds
mMediaRecorder.setCaptureRate(5); // capture a frame every 1 seconds
// Step 4: Set output file to the socket
mVideoFile = new File(getOutputMediaFile().toString());
mMediaRecorder.setOutputFile(mVideoFile.getAbsolutePath());
if (cameratype == 1)
mMediaRecorder.setOrientationHint(90);
else if (cameratype == 2)
mMediaRecorder.setOrientationHint(270);
mMediaRecorder.setMaxDuration(60000);
mMediaRecorder.setOnInfoListener(this);
// Step 5: Set the preview output
mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
try {
mMediaRecorder.prepare();
} catch (IllegalStateException e) {
releaseMediaRecorder();
return false;
} catch (IOException e) {
releaseMediaRecorder();
return false;
}
return true;
}
回答1:
You need to pass the current camera id while using get() in CamcoderProfile
. It will return the profile of default camera if this argument is not passed.
Try,
mMediaRecorder.setProfile(CamcorderProfile.get(camId,CamcorderProfile.QUALITY_TIME_LAPSE_480P));
来源:https://stackoverflow.com/questions/33199834/nullpointerexception-if-try-to-record-video-again-after-cancelling