ArrayAdapter实现仿QQ左右发送消息显示

package com.xiaoke.arrayadapte;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
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.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {
// private String[] data;
private List<String> list;
private EditText et;
private ListView listview;
private int index = 0;
private ArrayAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listview = (ListView) findViewById(R.id.lv_id);

et = (EditText) findViewById(R.id.et_id);
list = new ArrayList<String>();
Button btn;

adapter = new PangAdapter(this, -1);
listview.setAdapter(adapter);

btn = (Button) findViewById(R.id.btn_left_a_id);
btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// 左边发送消息
sendMessege("#");
}
});

btn = (Button) findViewById(R.id.btn_right_id);
btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// 右边发送消息
sendMessege("&");
}
});
// data = new String[100];
// for (int i = 0; i < 100; i++) {
// data[i] = "数据" + i;
// }
// ArrayAdapter adapter=new ArrayAdapter(this,
// android.R.layout.simple_list_item_1, data);
}

// 更新数据并且更新界面
public void sendMessege(String str) {
list.add(et.getText().toString() + str);
et.setText(null);
// 界面更新
adapter.notifyDataSetChanged();
listview.setSelection(ListView.FOCUS_DOWN);
}

public class PangAdapter extends ArrayAdapter {
private LayoutInflater flater = null;

public PangAdapter(Context context, int resource) {
super(context, resource);
//
flater = LayoutInflater.from(context);
}

// 获取数组的长度
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// 不需多次调用，
if (convertView == null) {
convertView = flater.inflate(R.layout.test, null);
Log.d("创建数据", list.get(position));
}
TextView tvLeft = (TextView) convertView
.findViewById(R.id.text_left_a1_id);
TextView tvRight = (TextView) convertView
.findViewById(R.id.text_right_a2_id);
ImageView imageLeft = (ImageView) convertView
.findViewById(R.id.image_left_a1_id);
ImageView imageRight = (ImageView) convertView
.findViewById(R.id.image_right_a2_id);
// 取出每次输入后最后一个字符
char c = list.get(position).charAt(list.get(position).length() - 1);
Log.d(String.valueOf(c), String.valueOf(c) + "1");
// 每次输入的字符串添加到StringBuffer中
StringBuffer strbuffer = new StringBuffer();
strbuffer.append(list.get(position));
// 最后一个字符判断是左边发送还是右边发送消息#代表左边&代表右边
if (String.valueOf(c).equals("&")) {
// 去除每次传入的最后一个字符
strbuffer.deleteCharAt(strbuffer.length() - 1);
String s = strbuffer.toString();
// 右边字符串设置
tvRight.setText(s);
// imageLeft.setImageResource(-1);
// 右边字图片设置
imageRight.setImageResource(R.drawable.ic_launcher);
// 左边字图片设置
imageLeft.setImageBitmap(null);
// 左边字符串设置
tvLeft.setText("");
// 清空缓存数组中的内容
strbuffer.delete(0, strbuffer.length());
Log.d("tvA2", "出现tvA2");
} else if (String.valueOf(c).equals("#")) {
// 去除每次传入的最后一个字符
strbuffer.deleteCharAt(strbuffer.length() - 1);
String s = strbuffer.toString();
// 左边字符串设置
tvLeft.setText(s);
// 右边字符串设置
tvRight.setText("");
// 左边字图片设置
imageLeft.setImageResource(R.drawable.ic_launcher);
// imageRight.setImageResource(-1);
// 右边字图片设置
imageRight.setImageBitmap(null);
// 清空缓存数组中的内容
strbuffer.delete(0, strbuffer.length());
Log.d("tvA1", "出现tvA1");
}
return convertView;
}

}

}

<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"
android:orientation="vertical"
tools:context="com.xiaoke.arrayadapte.MainActivity" >

<ListView
android:id="@+id/lv_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ListView>

<LinearLayout

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/btn_left_a_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送" />
<EditText
android:id="@+id/et_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />

<Button
android:id="@+id/btn_right_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送" />
</LinearLayout>

</LinearLayout>

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

<ImageView
android:id="@+id/image_left_a1_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp" />

<TextView
android:id="@+id/text_left_a1_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@id/image_left_a1_id"
android:textColor="@android:color/holo_red_dark"
android:textSize="20sp"
android:textStyle="bold" />

<ImageView
android:id="@+id/image_right_a2_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="20dp" />

<TextView
android:id="@+id/text_right_a2_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="@id/image_right_a2_id"
android:textColor="@android:color/holo_red_dark"
android:textSize="20sp"
android:textStyle="bold" />

</RelativeLayout>