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Android ListFragment实例Demo（自定义适配器）

2024-07-08 02:29:18   228人阅读

上一篇文章介绍了ListFragment，其中的ListView并没有自定义适配器，实际上在实际开发中常会用到自定义适配器，是实现更复杂的列表数据展示。所以这篇文章增加了自定义适配器，来进行ListView数据的展示。

实现效果图：

左边是Activity中的一个按钮，点击按钮会出现右边的Fragment相应的数据列表。


代码展示：

布局文件：

activity_main:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >


    <LinearLayout
        android:id="@+id/left"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical" 
        android:background="#DDCCFF">


        <Button
            android:id="@+id/button1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="显示列表" />


    </LinearLayout>


    <LinearLayout
        android:id="@+id/right"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:orientation="vertical" 
        android:background="#DDFFCC">
    </LinearLayout>


</LinearLayout>

article.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <ListView
        android:id="@id/android:list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

item.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

   <TextView 
       android:id="@+id/textView"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textSize="20sp"/>

</LinearLayout>
代码文件：

package com.fragmentdemo9_listfragment2;

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
/**
 *ListFragment的实例Demo优化版一。 
 *
 */
public class MainActivity extends Activity {
	private Button button;
	private FragmentManager manager;
	private FragmentTransaction transaction;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		manager = getFragmentManager();
		button = (Button) findViewById(R.id.button1);
		button.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				transaction = manager.beginTransaction();
				ArticleListFragment articleListFragment = new ArticleListFragment();
				transaction.replace(R.id.right, articleListFragment, "right");
				transaction.commit();
			}
		});
	}

}

ArticleListFragment.java：

package com.fragmentdemo9_listfragment2;

import java.util.ArrayList;

import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.Toast;
/**
 * 本例中的唯一一个Fragment
 * @author Administrator
 *
 */
public class ArticleListFragment extends ListFragment {
	private MyAdapter adapter;
	private ArrayList<String> list = new ArrayList<String>();

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		for (int i = 0; i < 30; i++) {
			list.add("item" + i);
		}
		adapter = new MyAdapter(getActivity(), list);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.article, null);
		setListAdapter(adapter);
		return view;
	}
	@Override
	public void onListItemClick(ListView l, View v, int position, long id) {
		super.onListItemClick(l, v, position, id);
		Toast.makeText(getActivity(), list.get(position), Toast.LENGTH_SHORT).show();
	}

}

MyAdapter：

package com.fragmentdemo9_listfragment2;

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
/**
 * 自定义适配器MyAdapter
 *
 */
public class MyAdapter extends BaseAdapter {
	private ArrayList<String> list;
	private Context context;

	public MyAdapter(Context context, ArrayList<String> list) {
		this.list = list;
		this.context = context;
	}

	@Override
	public int getCount() {
		return list.size();
	}

	@Override
	public Object getItem(int position) {
		return list.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder holder = new ViewHolder();
		;
		if (convertView == null) {
			convertView = LayoutInflater.from(context).inflate(R.layout.item,
					null);
			holder.textView = (TextView) convertView
					.findViewById(R.id.textView);
			convertView.setTag(holder);
		} else {
			holder = (ViewHolder) convertView.getTag();
		}
		holder.textView.setText(list.get(position).toString());

		return convertView;
	}

	class ViewHolder {
		TextView textView;
	}
}

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