我在几个 Activity 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。
我想要的是 Activity 类是这样的:
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 类看起来像这样:
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 fragment 中收到 onActivityResult
的回电。
最佳答案
操作系统不支持将 onActivityResult()
发送到 Fragment
。不过,支持库有一种机制可以做到这一点,即在 AppCompatActivity
中注册对特殊表的调用。这里的技巧是你必须使用 Fragment
自己的 startActivityForResult()
,不是 Activity
的。
因此,您的 Camera
类代码应如下所示:
public class Camera{
public static void dispatchTakePictureIntent(Activity activity, Fragment fragment, 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);
fragment.startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
}
注意最后一行使用了 Fragment
的 startActivityForResult()
关于java - 如何在Java类中封装一个startActivityForResult并在调用该方法的Activity上获取onActivityResult,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55464068/