第一章，listview的简易用法（Android）

这篇文章主要是练习了安卓listview的arrayadapter和baseadapter的简单填充。

1.arrayadapter填充

布局：

<RelativeLayout 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/main_listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        ></ListView>

</RelativeLayout>

代码：

package com.example.demo02;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

    private ListView main_listview;

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

        // 初始化控件和数据
        initView();
    }

    private void initView() {

        main_listview = (ListView) this.findViewById(R.id.main_listview);

        // 初始化数据
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1);

        for (int i = 0; i < 20; i++) {
            adapter.add("item-->" + i);
        }

        // 为listview添加item
        main_listview.setAdapter(adapter);

    }

}

2.baseadapter填充

布局：

<RelativeLayout 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/main_listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        ></ListView>

</RelativeLayout>

package com.example.demo03;

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

public class MainActivity extends Activity {

    private ListView main_listview;

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

//        初始化数据
        initView();
    }

    private void initView() {
        // TODO Auto-generated method stub

        main_listview = (ListView) this.findViewById(R.id.main_listview);

        MainAdapter adapter = new MainAdapter(this);

        main_listview.setAdapter(adapter);

    }

}

mainadapter：

package com.example.demo03;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MainAdapter extends BaseAdapter {

    private Context context;

    public MainAdapter(Context context) {
        this.context = context;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return 10;
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return arg0;
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return arg0;
    }

    @Override
    public View getView(int arg0, View arg1, ViewGroup arg2) {
        // TODO Auto-generated method stub

        TextView tv = new TextView(context);
        tv.setText("item···>"+arg0);

        return tv;
    }

}