最佳答案
OnActivityResult()未在新的嵌套片段 API 中调用
我一直在使用 Android 在支持库中包含的新 嵌套的碎片 API。
我在处理嵌套片段时遇到的问题是，如果一个嵌套片段(即通过 getChildFragmentManager()返回的 FragmentManager添加到另一个片段中的片段)调用 startActivityForResult()，那么嵌套片段的 onActivityResult()方法就不会被调用。但是，父片段的 onActivityResult()和活动的 onActivityResult()都会被调用。
我不知道我是否遗漏了关于嵌套片段的一些东西，但是我没有预料到所描述的行为。下面是重现这个问题的代码。如果有人能为我指明正确的方向，并向我解释我做错了什么，我将不胜感激:
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 _ part _ conter.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>
