ArrayAdapter实现仿QQ左右发送消息显示

效果图

代码

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;@Overrideprotected 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() {@Overridepublic void onClick(View v) {// 左边发送消息sendMessege("#");}});btn = (Button) findViewById(R.id.btn_right_id);btn.setOnClickListener(new OnClickListener() {@Overridepublic 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@Overridepublic int getCount() {// TODO Auto-generated method stubreturn list.size();}@Overridepublic 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;}}}

布局文件

<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>