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   源码介绍

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package com.study.androidtest;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;

import com.qqtest.adapter.MsgAdapter;
import com.test.model.MsgInfo;

public class MainActivity extends Activity {

	ListView lvMsg;
	Spinner spaMsgFrom;
	EditText edtTxtMsg;
	Button btnSend;
	ArrayList<MsgInfo> mArray;
	MsgAdapter mAdapter;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		lvMsg=(ListView)findViewById(R.id.lv_msg);
		spaMsgFrom=(Spinner)findViewById(R.id.spn_msg_from);
		edtTxtMsg=(EditText)findViewById(R.id.editTxt_msg);
		btnSend=(Button)findViewById(R.id.btn_send);
		
		mArray=new ArrayList<MsgInfo>();
		mArray.add(new MsgInfo("你好","我",R.drawable.head_4));
		mArray.add(new MsgInfo("我们的十年在哪里呢？","我",R.drawable.head_4));
		mAdapter=new MsgAdapter(MainActivity.this,mArray);
		lvMsg.setAdapter(mAdapter);
		
		btnSend.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				 TextView tv=(TextView)spaMsgFrom.getSelectedView();
				 String strName=tv.getText().toString();
				 String strMsg=edtTxtMsg.getText().toString();
				 edtTxtMsg.getText().clear();
				 int iHead;
				 if(strName.equals("静静")){
					 iHead=R.drawable.head_1;
				 }else if(strName.equals("妹子")){
					 iHead=R.drawable.head_2;
				 }else if(strName.equals("科比")){
					 iHead=R.drawable.head_3;
				 }else{
					 iHead=R.drawable.head_4;
				 }
				 
				 mArray.add(new MsgInfo(strMsg,strName,iHead));
				 mAdapter.notifyDataSetChanged();
				 
			}
			
		});
		
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}