当相机活动返回时，承载这个片段的活动有它的onActivityResult被调用。
我的片段开始一个活动的结果与意图发送给相机拍照。图片应用程序加载正常，拍摄照片并返回。然而onActivityResult从未被击中。我设置了断点，但什么都没有触发。一个片段可以有onActivityResult吗?我想是的，因为它是一个已提供的函数。为什么这个没有被触发?
ImageView myImage = (ImageView)inflatedView.findViewById(R.id.image);
myImage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, 1888);
}
});
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if( requestCode == 1888 ) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
((ImageView)inflatedView.findViewById(R.id.image)).setImageBitmap(photo);
}
}
对于Android的导航组件，当你嵌套fragment时，这个问题就像一个无法解决的谜。
基于以下回答的知识和灵感，我想出了一个简单的解决方案:
在这篇文章中回答
在这篇文章中回答
在你的活动的onActivityResult()中，你可以循环使用FragmentManager的getFragments()方法获得的活动片段列表。
请注意，要做到这一点，您需要使用getSupportFragmentManager()或目标API 26及以上。
这里的想法是循环遍历列表，使用instanceof检查列表中每个Fragment的实例类型。
虽然循环这个Fragment类型的列表是理想的，但不幸的是，当你使用Android导航组件时，列表将只有一个项目，即NavHostFragment。
现在怎么办?我们需要让碎片知道NavHostFragment。NavHostFragment本身就是一个Fragment。因此，使用getChildFragmentManager(). getfragments()，我们再次得到一个List<Fragment>的片段已知我们的NavHostFragment。我们循环遍历这个列表，检查每个Fragment的实例。
一旦我们在列表中找到我们感兴趣的片段，我们就调用它的onActivityResult()，将活动的onActivityResult()声明的所有参数传递给它。
// Your activity's onActivityResult()
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
List<Fragment> lsActiveFragments = getSupportFragmentManager().getFragments();
for (Fragment fragmentActive : lsActiveFragments) {
if (fragmentActive instanceof NavHostFragment) {
List<Fragment> lsActiveSubFragments = fragmentActive.getChildFragmentManager().getFragments();
for (Fragment fragmentActiveSub : lsActiveSubFragments) {
if (fragmentActiveSub instanceof FragWeAreInterestedIn) {
fragmentActiveSub.onActivityResult(requestCode, resultCode, data);
}
}
}
}
}
public class takeimage extends Fragment {
private Uri mImageCaptureUri;
private static final int PICK_FROM_CAMERA = 1;
private static final int PICK_FROM_FILE = 2;
private String mPath;
private ImageView mImageView;
Bitmap bitmap = null;
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.activity_send_image, container, false);
final String[] items = new String[] { "From Camera", "From SD Card" };
mImageView = (ImageView)view.findViewById(R.id.iv_pic);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.select_dialog_item, items);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Select Image");
builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
if (item == 0) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(Environment.getExternalStorageDirectory(), "tmp_avatar_"
+ String.valueOf(System.currentTimeMillis())
+ ".jpg");
mImageCaptureUri = Uri.fromFile(file);
try {
intent.putExtra(
android.provider.MediaStore.EXTRA_OUTPUT,
mImageCaptureUri);
intent.putExtra("return-data", true);
getActivity().startActivityForResult(intent,
PICK_FROM_CAMERA);
} catch (Exception e) {
e.printStackTrace();
}
dialog.cancel();
} else {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
getActivity().startActivityForResult(
Intent.createChooser(intent,
"Complete action using"), PICK_FROM_FILE);
}
}
});
final AlertDialog dialog = builder.create();
Button show = (Button) view.findViewById(R.id.btn_choose);
show.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Switch the tab content to display the list view.
dialog.show();
}
});
return view;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != Activity.RESULT_OK)
return;
if (requestCode == PICK_FROM_FILE) {
mImageCaptureUri = data.getData();
// mPath = getRealPathFromURI(mImageCaptureUri); //from Gallery
if (mPath == null)
mPath = mImageCaptureUri.getPath(); // from File Manager
if (mPath != null)
bitmap = BitmapFactory.decodeFile(mPath);
} else {
mPath = mImageCaptureUri.getPath();
bitmap = BitmapFactory.decodeFile(mPath);
}
mImageView.setImageBitmap(bitmap);
}
public String getRealPathFromURI(Uri contentUri) {
String [] proj = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery(contentUri, proj, null, null,null);
if (cursor == null) return null;
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
}
你的代码有一个嵌套的片段。调用超。onActivityForResult不起作用
你不希望修改你的片段可以被调用的每个活动，或者绕过调用片段链中的每个片段。
这是许多可行的解决方案之一。动态地创建一个片段，并使用支持片段管理器将其直接连接到活动。然后从新创建的片段调用startActivityForResult。
private void get_UserEmail() {
if (view == null) {
return;
}
((TextView) view.findViewById(R.id.tvApplicationUserName))
.setText("Searching device for user accounts...");
final FragmentManager fragManager = getActivity().getSupportFragmentManager();
Fragment f = new Fragment() {
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
startActivityForResult(AccountPicker.newChooseAccountIntent(null, null,
new String[]{"com.google"}, false, null, null, null, null), REQUEST_CODE_PICK_ACCOUNT);
}
@Override
public void onActivityResult(int requestCode, int resultCode,
Intent data) {
if (requestCode == REQUEST_CODE_PICK_ACCOUNT) {
String mEmail = "";
if (resultCode == Activity.RESULT_OK) {
if (data.hasExtra(AccountManager.KEY_ACCOUNT_NAME)) {
mEmail = data
.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
}
}
if (mActivity != null) {
GoPreferences.putString(mActivity, SettingApplication.USER_EMAIL, mEmail);
}
doUser();
}
super.onActivityResult(requestCode, resultCode, data);
fragManager.beginTransaction().remove(this).commit();
}
};
FragmentTransaction fragmentTransaction = fragManager
.beginTransaction();
fragmentTransaction.add(f, "xx" + REQUEST_CODE_PICK_ACCOUNT);
fragmentTransaction.commit();
}
