Handler传递参数动态更新UI界面demo

主程序:

package com.example.demo_test;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {private TextView tvShow;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tvShow = (TextView) findViewById(R.id.tv_show);new Thread(new ThreadChangeUI(handler)).start();}// handler类接收数据Handler handler = new Handler() {public void handleMessage(Message msg) {if (msg.what == 1) {// 动态更新UI界面String str = msg.getData().getInt("num") + "";System.out.println("str----------------->" + str);tvShow.setText(str);}};};@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);return true;}}

线程:

package com.example.demo_test;import android.os.Bundle;import android.os.Handler;import android.os.Message;public class ThreadChangeUI implements Runnable {private Handler handler;private int num = 0;public ThreadChangeUI(Handler handler) {// TODO Auto-generated constructor stubthis.handler = handler;}@Overridepublic void run() {// 每秒改变textview的值while (true) {try {Thread.sleep(1000);Message msg = new Message();msg.what = 1;// handler传递参数// handler.sendMessage(msg);Bundle bundle = new Bundle();bundle.putInt("num", num++);System.out.println("num---------->" + num);msg.setData(bundle);handler.sendMessage(msg);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();System.out.println("thread error...");}}}}

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