Android 相机捕获活动返回空 Uri [英] Android camera capture activity returns null Uri
问题描述
此代码以前适用于三星,但现在我将 Nexus One 与 Android 2.3.6 一起使用,一旦我拍照并单击确定"或从图库中选择一张照片,它就会崩溃.Stacktrace 在 Uri 上显示空指针异常.
我的相机激活代码如下:
This code worked on samsung before but now that i'm using Nexus One with Android 2.3.6, it's crashing as soon as I take a picture and click ok or choose a photo from gallery. Stacktrace shows a null pointer exception on the Uri.
My code for the activating the camera is as follows:
public void activateCamera(View view){
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// start the image capture Intent
startActivityForResult(i, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if ((requestCode == CHOOSE_IMAGE_ACTIVITY_REQUEST_CODE || requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE)
&& resultCode == RESULT_OK && null != data) {
selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
Bitmap bits = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = inSampleSize;
try {
bits = BitmapFactory.decodeStream(new FileInputStream(picturePath),null,options);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
知道可能是什么问题吗?谢谢!
Any idea what could be the problem? Thanks!
推荐答案
你必须告诉相机,在哪里保存图片并自己记住uri:
You have to tell the camera, where to save the picture and remeber the uri yourself:
private Uri mMakePhotoUri;
private File createImageFile() {
// return a File object for your image.
}
private void makePhoto() {
try {
File f = createImageFile();
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
mMakePhotoUri = Uri.fromFile(f);
i.putExtra(MediaStore.EXTRA_OUTPUT, mMakePhotoUri);
startActivityForResult(i, REQUEST_MAKE_PHOTO);
} catch (IOException e) {
Log.e(TAG, "IO error", e);
Toast.makeText(getActivity(), R.string.error_writing_image, Toast.LENGTH_LONG).show();
}
}
@Override
public void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
switch (requestCode) {
case REQUEST_MAKE_PHOTO:
if (resultCode == Activity.RESULT_OK) {
// do something with mMakePhotoUri
}
return;
default: // do nothing
super.onActivityResult(requestCode, resultCode, data);
}
}
您应该使用 onCreate()
和 onSaveInstanceState()
将 mMakePhotoUri
的值保存在实例状态上.
You should save the value of mMakePhotoUri
over instance states withing onCreate()
and onSaveInstanceState()
.
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