在Fragment中，startActivityForResult不起作用。
在Fragment中，startActivityForResult不起作用。
我正在尝试从相机或图库中获取图像，以下是我正在运行的代码，但是在startActivityForResult中出现错误：
public class NewPatient extends Fragment {
Button Takeimage, save, cancel;
int REQUEST_CAMERA = 0, SELECT_FILE = 1;
ImageView imageview1;
Uri imageUri;
private Bitmap bitmap;
MediaPlayer mp = new MediaPlayer();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View myFragmentView = inflater.inflate(R.layout.activity_new_patient, container, false);
imageview1 = (ImageView) myFragmentView.findViewById(R.id.imageNP);
Takeimage = (Button) myFragmentView.findViewById(R.id.takeimg);
save = (Button) myFragmentView.findViewById(R.id.save);
cancel = (Button) myFragmentView.findViewById(R.id.cancel);
Pakage = (Spinner) myFragmentView.findViewById(R.id.packages);
Takeimage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
selectImage();
}
});
imageview1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
getActivity().openOptionsMenu();
}
});
return myFragmentView;
}
private void selectImage() {
final CharSequence[] items = { "拍照", "从图库选择",
"取消" };
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("添加照片！");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("拍照")) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, REQUEST_CAMERA);
} else if (items[item].equals("从图库选择")) {
Intent intent = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult(
Intent.createChooser(intent, "选择文件"),
SELECT_FILE);
} else if (items[item].equals("取消")) {
dialog.dismiss();
}
}
});
builder.show();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == SELECT_FILE)
onSelectFromGalleryResult(data);
else if (requestCode == REQUEST_CAMERA)
onCaptureImageResult(data);
}
}
private void onCaptureImageResult(Intent data) {
Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
File destination = new File(Environment.getExternalStorageDirectory(),
System.currentTimeMillis() + ".jpg");
FileOutputStream fo;
try {
destination.createNewFile();
fo = new FileOutputStream(destination);
fo.write(bytes.toByteArray());
fo.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
imageview1.setImageBitmap(thumbnail);
}
@SuppressWarnings("deprecation")
private void onSelectFromGalleryResult(Intent data) {
Uri selectedImageUri = data.getData();
String[] projection = { MediaColumns.DATA };
Cursor cursor = getActivity().managedQuery(selectedImageUri, projection, null, null,
null);
int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
cursor.moveToFirst();
String selectedImagePath = cursor.getString(column_index);
Bitmap bm;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(selectedImagePath, options);
final int REQUIRED_SIZE = 200;
int scale = 1;
while (options.outWidth / scale / 2 >= REQUIRED_SIZE
&& options.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
options.inSampleSize = scale;
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(selectedImagePath, options);
imageview1.setImageBitmap(bm);
}
这就是我的代码，但是我不知道问题在哪里，我无法理解它。
有人可以帮帮我吗？
问题出现的原因：
在Fragment中调用startActivityForResult方法时，无法正常工作。
解决方法：
1. 在Fragment中调用startActivityForResult方法时，需要确保父Activity中也重写了onActivityResult方法，并且在父Activity中调用了super.onActivityResult方法。这样才能正确地将结果传递给Fragment。
2. 确保在调用startActivityForResult方法时，传递的requestCode参数与在onActivityResult方法中进行判断的requestCode参数相匹配。
3. 确保在调用startActivityForResult方法时，传递的Intent参数正确地设置了action和category属性，以确保能够选择到正确的图片。
以下是一个解决方案的示例代码：
// 在Fragment中调用startActivityForResult方法
case R.id.browse_pic:
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, SELECT_REQUEST);
break;
// 在父Activity中重写onActivityResult方法，并调用super.onActivityResult方法
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// 将结果传递给Fragment
fragment.onActivityResult(requestCode, resultCode, data);
}
// 在Fragment中重写onActivityResult方法，处理结果
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SELECT_REQUEST && resultCode == Activity.RESULT_OK) {
// 处理选择图片的结果
try {
InputStream stream = getActivity().getContentResolver().openInputStream(data.getData());
pic = BitmapFactory.decodeStream(stream);
stream.close();
imageView.setImageBitmap(pic);
} catch (Exception e) {
e.printStackTrace();
}
}
}
通过以上的解决方法，可以解决在Fragment中调用startActivityForResult方法无法正常工作的问题。
