我正在开发一个应用程序，当用户按下某个按钮时，我想打开相机来录制视频。
这是我启动相机的方法：
public void recordVideo(boolean highQuality) {
if (isIntentAvailable(MediaStore.ACTION_VIDEO_CAPTURE)) {
videoFile = createFile(MEDIA_TYPE_VIDEO);
if(videoFile != null){
videoFileUri = Uri.fromFile(videoFile);
Intent recordVideo = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
recordVideo.putExtra(android.provider.MediaStore.EXTRA_OUTPUT,
videoFileUri);
recordVideo.putExtra(
android.provider.MediaStore.EXTRA_VIDEO_QUALITY,
highQuality ? 1 : 0);
recordVideo.putExtra(
android.provider.MediaStore.EXTRA_DURATION_LIMIT, 30);
cameraStarted = true;
startActivityForResult(recordVideo, ACTION_TAKE_VIDEO);
}
} else {
Toast.makeText(this, R.string.no_camera, Toast.LENGTH_SHORT).show();
}
}
在这里我制作文件：
private File createFile(int type) {
File mediaFile = null;
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
File mediaStorageDir = new File(
Environment.getExternalStorageDirectory() + "/Zorgdossier", "Media");
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d(TAG, "failed to create directory");
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
if (type == MEDIA_TYPE_IMAGE) {
mediaFile = new File(mediaStorageDir.getPath() + "/" + "IMG_"
+ timeStamp + ".jpg");
} else if (type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + "/" + "VID_"
+ timeStamp + ".mp4");
} else {
return null;
}
}
else{
Log.d(TAG, "No external storage found");
Toast.makeText(this, getString(R.string.storageNotAvailable), Toast.LENGTH_SHORT).show();
}
return mediaFile;
}
当我录制视频并按下保存按钮时，应用程序崩溃并出现以下错误：
这是错误堆栈：
E/AndroidRuntime( 3972): FATAL EXCEPTION: main
E/AndroidRuntime( 3972): java.lang.NullPointerException
E/AndroidRuntime( 3972): at java.io.File.fixSlashes(File.java:205)
E/AndroidRuntime( 3972): at java.io.File.init(File.java:189)
E/AndroidRuntime( 3972): at java.io.File.<init>(File.java:139)
E/AndroidRuntime( 3972): at com.sec.android.app.camera.CamcorderEngine.renameTempFile(CamcorderEngine.java:1132)
E/AndroidRuntime( 3972): at com.sec.android.app.camera.CamcorderEngine.doStopVideoRecordingSync(CamcorderEngine.java:772)
E/AndroidRuntime( 3972): at com.sec.android.app.camera.CeStateRecording.handleRequest(CeStateRecording.java:69)
E/AndroidRuntime( 3972): at com.sec.android.app.camera.CeRequestQueue.startFirstRequest(CeRequestQueue.java:104)
E/AndroidRuntime( 3972): at com.sec.android.app.camera.CeRequestQueue.access$300(CeRequestQueue.java:32)
E/AndroidRuntime( 3972): at com.sec.android.app.camera.CeRequestQueue$MainHandler.handleMessage(CeRequestQueue.java:54)
E/AndroidRuntime( 3972): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 3972): at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime( 3972): at android.app.ActivityThread.main(ActivityThread.java:3687)
E/AndroidRuntime( 3972): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 3972): at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime( 3972): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
E/AndroidRuntime( 3972): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
E/AndroidRuntime( 3972): at dalvik.system.NativeStart.main(Native Method)
任何想法是什么导致这个错误？奇怪的是，录制的视频正确地保存在我指定的地图中。
编辑：这是在三星银河 gio 上测试的。