Question

我有一个我正在尝试做的项目。我遇到了一个小问题，我不知道如何绕过它。下面是目前为止的应用程序的图像。

我想要做的是当用户点击其中一个列表项时，显示“Hello！It's Fragment2”的部分更改为我在应用程序中声明的新xml。因此，如果我单击ATO listItem，那么右侧的片段应该更改为“Hello！It's ATO Fragment”

enter image description here

到目前为止，这是我的代码：

AndroidListFragmentActivity：

package com.exercise.AndroidListFragment;

import android.app.Activity;
import android.os.Bundle;

public class AndroidListFragmentActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

Fragment2：

package com.exercise.AndroidListFragment;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment2 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        return inflater.inflate(R.layout.fragment2, container, false);
    }

}

MyListFragment1：

package com.exercise.AndroidListFragment;

import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MyListFragment1 extends ListFragment {

    String[] options ={
            "ATO", 
            "BETA", 
            "DELT", 
            "PHI DELT",
            "SAE", 
            "SIG NU", 
            "FIJI", 
            "SIG CHI",
            "PHI PSI" 
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ListAdapter myListAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, options);
        setListAdapter(myListAdapter);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.listfragment1, container, false);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        Toast.makeText(getActivity(), getListView().getItemAtPosition(position).toString(), Toast.LENGTH_LONG).show();
    }
}

Fragment2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/fragment2text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Hello! It's Fragment2" />
</LinearLayout>

listfragment1.xml

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:paddingLeft="8dp"
         android:paddingRight="8dp">

     <ListView android:id="@id/android:list"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
               android:layout_weight="1"
               android:drawSelectorOnTop="false"/>

     <TextView android:id="@id/android:empty"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
               android:text="No data"/>
 </LinearLayout>

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

  <fragment
      android:name="com.exercise.AndroidListFragment.MyListFragment1"
      android:id="@+id/fragment1"
      android:layout_weight="1"
      android:layout_width="0px"
      android:layout_height="match_parent" />
  <fragment
      android:name="com.exercise.AndroidListFragment.Fragment2"
      android:id="@+id/fragment2"
      android:layout_weight="2"
      android:layout_width="0px"
      android:layout_height="match_parent" />

</LinearLayout>

Answer 1

不确定让代码正常运行的最小修复方法是什么，但您是否考虑过使用 Navigation Drawer 来切换片段？在我看来，官方文档中的示例与您想要实现的完全匹配。

关键是要为当前显示的片段提供某种容器（而不是像XML中那样使用<fragment>）。例如：

 <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

然后，切换片段就像这样：

Fragment fragment = new Fragment2();
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
               .replace(R.id.content_frame, fragment)
               .commit();

进一步阅读：Android开发人员文档中的Add a Fragment to an Activity at Runtime。

Answer 2

private void openFragment (int number) {

        Fragment fragment = new Fragment();

        switch (number) {
            case FRAGMENT_1:
                fragment = new *Fragment1*();
                break;

            case FRAGMENT_2:
                fragment = new *Fragment2*();
                break;
        }

        getSupportFragmentManager().beginTransaction()
                .replace(R.id.fragment_frame, fragment)
                .commit();
    }

如何在onclick期间切换片段？

2 个答案: