安卓如何在Java类中封装startActivityForResult,并在调用该方法的活动上获取onActivityResult
我在几个活动中使用下一个摄像头代码,我想创建一个类来封装在Android中使用摄像头的方法
我想要得到的是活动类,类似于:
Public class Myfragment extends Fragment{
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.profile_fragment, container, false);
mButtonProfilePhoto = v.findViewById(R.id.buttonProfilePhoto);
mButtonProfilePhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Here I call the camera intent.
Camera.dispatchTakePictureIntent(getActivity(), mPhotoFile);
}
});
return v;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
//handle the camera result
}
Camera类如下所示:
public class Camera{
public static void dispatchTakePictureIntent(Activity activity, File file) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(activity.getPackageManager()) != null) {
// Create the File where the photo should go
file = null;
try {
file = Camera.createImageFile(activity);
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (file != null) {
Uri photoURI = FileProvider.getUriForFile(activity,
"com.itcom202.weroom.fileprovider",
file );
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult( takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
}
我现在遇到的问题是,我从未从片段中收到来自onActivityResult
的回调
# 1 楼答案
OS不支持将} ,而不是
onActivityResult()
发送到Fragment
的。不过,支持库有一种机制可以做到这一点,即注册对AppCompatActivity
中特殊表的调用。这里的技巧是,您必须使用Fragment
自己的^{Activity
的因此,您的
Camera
类代码应该如下所示:注意,最后一行使用了
Fragment
的startActivityForResult()