android 中Fragment 的简单使用

最新推荐文章于 2025-08-19 16:55:40 发布

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本文介绍了一种在Android应用中实现双窗格布局的方法，通过使用Fragment展示数据列表及详细内容。首先加载布局文件，并在主活动中设置内容视图。接着通过TitlesFragment展示设备名称列表，当列表项被点击时，将显示对应详情。使用DetailsFragment来显示选定项目的具体信息。

1.以下程序界面是参考官网代码来实现：

2.主要是加载一个布局文件：

public class MainActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


    }
}

package com.sunplus.app.activity;


import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;


import com.sunplus.app.util.LeftTitle;


public class TitlesFragment extends ListFragment {


    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);


        // Populate list with our static array of titles.
        setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_activated_1, LeftTitle.DEVICENAME));


    }


    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        showDetails(position);
    }


    private void showDetails(int index) {


        // Check what fragment is currently shown, replace if needed.
        DetailsFragment details = (DetailsFragment) getFragmentManager().findFragmentById(R.id.details);
        if (details == null || details.getShownIndex() != index) {
            // Make new fragment to show this selection.
            details = DetailsFragment.newInstance(index);


            // Execute a transaction, replacing any existing fragment
            // with this one inside the frame.
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.replace(R.id.details, details);
            ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
            ft.commit();
        }


    }


}

package com.sunplus.app.activity;


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


import com.sunplus.app.adapter.GetDetailData;


public class DetailsFragment extends Fragment {


    /**
     * Create a new instance of DetailsFragment, initialized to show the text at
     * 'index'.
     */
    public static DetailsFragment newInstance(int index) {
        DetailsFragment f = new DetailsFragment();


        // Supply index input as an argument.
        Bundle args = new Bundle();
        args.putInt("index", index);
        f.setArguments(args);


        return f;
    }


    public int getShownIndex() {
        return getArguments().getInt("index", 0);
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = null;


        //此处添加需要显示的布局文件


        return view;


    }


}

activity_main.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="horizontal" >

   <fragment
        android:id="@+id/titles"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1"
        class="com.sunplus.app.activity.TitlesFragment" />

    <FrameLayout
        android:id="@+id/details"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="?android:attr/detailsElementBackground" />


</LinearLayout>