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我一直在使用Android在支持庫中包含的新的nested fragment API。onActivityResult（）未在新的嵌套片段中調用API
，我嵌套片段面臨的問題是，如果一個嵌套片段（即，已經被添加到由getChildFragmentManager()返回經由FragmentManager另一個片段的片段）調用startActivityForResult()，嵌套片段的onActivityResult()方法沒有調用。但是，父代片段的onActivityResult()和活動的onActivityResult()確實被調用。
我不知道我是否缺少關於嵌套片段的內容，但我沒有想到所描述的行爲。以下是重現此問題的代碼。我將非常感激，如果有人能在正確的方向指向我，向我解釋什麼，我做錯了：
package com.example.nestedfragmentactivityresult;
import android.media.RingtoneManager;
import android.os.Bundle;
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends FragmentActivity
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.getSupportFragmentManager()
.beginTransaction()
.add(android.R.id.content, new ContainerFragment())
.commit();
}
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
// This is called
Toast.makeText(getApplication(),
"Consumed by activity",
Toast.LENGTH_SHORT).show();
}
public static class ContainerFragment extends Fragment
{
public final View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState)
{
View result = inflater.inflate(R.layout.test_nested_fragment_container,
container,
false);
return result;
}
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
getChildFragmentManager().beginTransaction()
.add(R.id.content, new NestedFragment())
.commit();
}
public void onActivityResult(int requestCode,
int resultCode,
Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
// This is called
Toast.makeText(getActivity(),
"Consumed by parent fragment",
Toast.LENGTH_SHORT).show();
}
}
public static class NestedFragment extends Fragment
{
public final View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState)
{
Button button = new Button(getActivity());
button.setText("Click me!");
button.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
startActivityForResult(intent, 0);
}
});
return button;
}
public void onActivityResult(int requestCode,
int resultCode,
Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
// This is NOT called
Toast.makeText(getActivity(),
"Consumed by nested fragment",
Toast.LENGTH_SHORT).show();
}
}
}
test_nested_fragment_container.xml是：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
一週前發現相同的錯誤。必須在嵌套的Fragment上手動調用onActivityResult（）。我個人認爲這是一個錯誤。實際上沒有檢查過它是否可以在框架中實現，但我認爲它可能是。他們只需要檢查頂級片段的所有子片段，並在每個片段上調用onActivityResult（）。如果在框架內沒有辦法做到這一點，那麼好的，就是這樣。但如果是這樣，我認真考慮這個錯誤。 –