ArrayAdapter适配器的用法,模拟QQ发消息界面。

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {
    EditText et;
    Button btn;
    ListView lv;
    MyAdapter mMyAdapter;
    ArrayList<String> date;

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

        date = new ArrayList<String>();
        et = (EditText) findViewById(R.id.et1);
        btn = (Button) findViewById(R.id.btn1);
        lv = (ListView) findViewById(R.id.lv);

        mMyAdapter = new MyAdapter(this, R.layout.list);
        // 设置ListView的适配器 （ArrayAdapter适配器的用法）
        lv.setAdapter(mMyAdapter);

        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                sendmessage();
            }
        });
    }

    public void sendmessage() {
        date.add(et.getText().toString());
        mMyAdapter.notifyDataSetChanged();
        // 发送完设置输入框为空
        et.setText(null);
        // 发送消息后将ListView滚动到最下方
        lv.setSelection(ListView.FOCUS_DOWN);
    }

    public class MyAdapter extends ArrayAdapter {
        private Context context;
        private int resource;

        public MyAdapter(Context context, int resource) {
            super(context, resource);
            this.resource = resource;
            this.context = context;
        }

        @Override
        public int getCount() {

            return date.size();
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            LayoutInflater flater = LayoutInflater.from(context);
            // 设置可以复用view
            if (convertView == null) {
                convertView = flater.inflate(resource, null);
            }
            TextView tv = (TextView) convertView.findViewById(R.id.qqtxt);
            tv.setText(date.get(position));

            return convertView;
        }

    }
}

xml文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/ImageView1"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:background="@drawable/meimei" />

    <TextView
        android:id="@+id/qqtxt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_toLeftOf="@+id/ImageView1"
        android:background="#ff5252"
        android:text="1233"
        android:textSize="20sp" />

</RelativeLayout>

<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="com.lixu.qqduihua.MainActivity" >

    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/commentLinearLayout"
        android:layout_alignParentTop="true"
        android:divider="@android:color/transparent"
        android:dividerHeight="15dip"
        android:scrollbars="none" />

    <LinearLayout
        android:id="@+id/commentLinearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="#e0e0e0"
        android:orientation="horizontal" >

        <EditText
            android:id="@+id/et1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:ems="10"
            android:hint="请输入内容" >

            <requestFocus />
        </EditText>

        <Button
            android:id="@+id/btn1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/round"
            android:text="发送" />
    </LinearLayout>

</RelativeLayout>

 运行效果：