[英]Android ViewGroup crash: Attempt to read from field 'int android.view.View.mViewFlags' on a null object reference
[英]Attempt to read from field 'int android.media.CamcorderProfile.fileFormat' on a null object reference
我在Nexus 7 2012上使用自定義攝像頭錄制視頻,但在其他設備(例如Zenfone 2,Galaxy S3,S6,HTC One M7,Oppo N1,Sony Xperia M4 ...)運行正常時,卻遇到了這個問題。
public static boolean prepareVideoRecorder(Context mContext, int mode) {
// Should release before use new Preview for Recording Video mode
CustomCamera.releaseCamera();
// Initialize camera
CustomCamera.mCamera = CustomCamera.getCameraInstance(mode);
CustomCamera.mCamera.startPreview();
// Set orientation display
setCameraDisplayOrientation((Activity) mContext, mode);
// Should release before use new Preview for Recording Video mode
CustomCamera.releaseMediaRecorder();
CustomCamera.mMediaRecorder = new MediaRecorder();
// Step 1: Unlock and set camera to MediaRecorder
CustomCamera.mCamera.unlock();
CustomCamera.mMediaRecorder.setCamera(CustomCamera.mCamera);
// Step 2: Set sources
CustomCamera.mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
CustomCamera.mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
// todo NullPointerException: Attempt to read from field 'int android.media.CamcorderProfile.fileFormat' on a null object reference
//
// returned true value, go inside
if (CamcorderProfile.hasProfile(current_camera_id, CamcorderProfile.QUALITY_LOW)) {
// CamcorderProfile.get(CamcorderProfile.QUALITY_LOW) RETURNED NULL VALUE, SO I CAN NOT SET PROFILE
CustomCamera.mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));
// Step 4: Set output file - pass False value to indicate choose Video mode
RECORDED_FILE_PATH = getOutputMediaFile(mContext, false).toString();
CustomCamera.mMediaRecorder.setOutputFile(RECORDED_FILE_PATH);
// Step 5: Set the preview output
/**
* Define Orientation of image in here,
* if in portrait mode, use value = 90,
* if in landscape mode, use value = 0
*/
if (current_camera_id == define.Camera.CAMERA_BACK)
// Back Camera
CustomCamera.mMediaRecorder = Utils.rotateBackVideo(CustomCamera.mMediaRecorder);
else
// Front Camera
CustomCamera.mMediaRecorder = Utils.rotateFrontVideo(CustomCamera.mMediaRecorder);
// Set preview display to refresh current screen
CustomCamera.mMediaRecorder.setPreviewDisplay(mCameraPreview.getHolder().getSurface());
// Step 6: Prepare configured MediaRecorder
try {
CustomCamera.mMediaRecorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
CustomCamera.releaseMediaRecorder();
return false;
} catch (IOException e) {
e.printStackTrace();
CustomCamera.releaseMediaRecorder();
return false;
}
return true;
}
我設置的這些權限:
<uses-feature android:name="android.hardware.camera.front" />
<uses-feature android:name="android.hardware.microphone"/>
<uses-permission android:name = "android.permission.CAMERA" />
<uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name = "android.permission.RECORD_AUDIO" />
<uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name = "android.permission.WRITE_INTERNAL_STORAGE" />
我要使它可以在Nexus 7 2012上錄制視頻。
知道的人
請告訴我如何解決。
謝謝,
p / s:如果刪除setProfile()
行, setProfile()
出現另一個異常,並且無法錄制視頻:
07-31 14:33:39.936 25960-25960/com.panasonic_Upload E/MediaRecorder﹕ setOutputFile called in an invalid state(2)
07-31 14:33:39.942 25960-25960/com.panasonic_Upload W/System.err﹕ java.lang.IllegalStateException
07-31 14:33:39.950 25960-25960/com.panasonic_Upload W/System.err﹕ at android.media.MediaRecorder._setOutputFile(Native Method)
07-31 14:33:39.950 25960-25960/com.panasonic_Upload W/System.err﹕ at android.media.MediaRecorder.prepare(MediaRecorder.java:740)
07-31 14:33:39.950 25960-25960/com.panasonic_Upload W/System.err﹕ at ui.fragment.camera.CameraPreviewFragment.prepareVideoRecorder(CameraPreviewFragment.java:533)
07-31 14:33:39.950 25960-25960/com.panasonic_Upload W/System.err﹕ at ui.fragment.camera.CameraPreviewFragment.onClick(CameraPreviewFragment.java:223)
07-31 14:33:39.950 25960-25960/com.panasonic_Upload W/System.err﹕ at android.view.View.performClick(View.java:4780)
07-31 14:33:39.951 25960-25960/com.panasonic_Upload W/System.err﹕ at android.view.View$PerformClick.run(View.java:19866)
07-31 14:33:39.951 25960-25960/com.panasonic_Upload W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:739)
07-31 14:33:39.951 25960-25960/com.panasonic_Upload W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
07-31 14:33:39.951 25960-25960/com.panasonic_Upload W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
07-31 14:33:39.951 25960-25960/com.panasonic_Upload W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5254)
07-31 14:33:39.951 25960-25960/com.panasonic_Upload W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
07-31 14:33:39.951 25960-25960/com.panasonic_Upload W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
07-31 14:33:39.952 25960-25960/com.panasonic_Upload W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
07-31 14:33:39.952 25960-25960/com.panasonic_Upload W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
調用get()時必須傳遞攝像機ID,與調用hasProfile()時完全相同。 否則,它將從找到的第一個后置攝像頭中獲取配置文件。
http://developer.android.com/reference/android/media/CamcorderProfile.html#pubmethods
Nexus 7 2012崩潰,因為它沒有后置攝像頭。
您需要這樣做:
CustomCamera.mMediaRecorder.setProfile(CamcorderProfile.get( current_camera_id , CamcorderProfile.QUALITY_LOW));
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