Android(安卓)开发中的 Handler ,Thread ,Message ,Runnable 的综合使用方法
边做边学的方法。
多线程更新UI的方法
layout 的布局文件
<?xml version="1.0" encoding="utf-8"?>
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
======================2个textView 一个用来显示时间，一个计数==========================
代码如下：
package com.dhanzhang;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class TestHandler extends Activity implements OnClickListener {
private TextView mTextView;
private TextView mTextView2;
private Button startServiceButton;
private Button stopServiceButton;
private Button bindServiceButton;
private Button unbindServiceButton;
private Button over;
protected static final int GUIUPDATEIDENTIFIER = 0x101;
int i = 0;
Thread myRefreshThread = null;
Handler handler2 = new Handler();
// 1.定义一个Handler(一般更新View)
Handler myHandler = new Handler() {
// 2.重写消息处理函数
public void handleMessage(Message msg) {
switch (msg.what) {
// 判断发送的消息
case TestHandler.GUIUPDATEIDENTIFIER:
// 更新View
Date d = new Date(System.currentTimeMillis());
SimpleDateFormat sf = new SimpleDateFormat(
"yyyy-MM-dd hh:mm:ss.SSS");
mTextView.setText(String.format("Runnable:%s ", sf.format(d)));
break;
}
super.handleMessage(msg);
}
};
Runnable runnable = new Runnable() {
@Override
public void run() {
mTextView2.setText(String.valueOf(i++));
handler2.postDelayed(runnable, 1000);
}
};
class myThread implements Runnable {
public void run() {
while (!Thread.currentThread().isInterrupted()) {
// 3.发送消息
Message message = new Message();
// 发送消息与处理函数里一致
message.what = TestHandler.GUIUPDATEIDENTIFIER;
// 内部类调用外部类的变量
TestHandler.this.myHandler.sendMessage(message);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
setupViews();
}
public void setupViews() {
mTextView = (TextView) findViewById(R.id.text);
mTextView2 = (TextView) findViewById(R.id.text2);
mTextView.setText("Begin To");
mTextView2.setText("Y");
startServiceButton = (Button) findViewById(R.id.startservice);
stopServiceButton = (Button) findViewById(R.id.stopservice);
bindServiceButton = (Button) findViewById(R.id.bindservice);
unbindServiceButton = (Button) findViewById(R.id.unbindservice);
over = (Button) findViewById(R.id.over);
startServiceButton.setOnClickListener(this);
stopServiceButton.setOnClickListener(this);
bindServiceButton.setOnClickListener(this);
unbindServiceButton.setOnClickListener(this);
over.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setResult(Activity.RESULT_OK);
finish();
}
});
}
@Override
public void onDestroy() {
super.onDestroy();
if (myRefreshThread != null) {
myRefreshThread.interrupt();
myRefreshThread.stop();
}
handler2.removeCallbacks(runnable) ;
}
public void onClick(View v) {
if (v == startServiceButton) {
myRefreshThread = new Thread(new myThread());
myRefreshThread.start();
} else if (v == stopServiceButton) {
myRefreshThread.interrupt();
} else if (v == bindServiceButton) {
handler2.post(runnable);
} else if( v== unbindServiceButton) {
handler2.removeCallbacks(runnable) ;
}
}
}
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ＰＳ：＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
onDestroy()的重写可能有问题，不过在虚拟机里看不出来啥问题，不知道实际情况会如何。
Ａｎｄｒｏｉｄ 版本是２．２
Runnable 接口并非真正的开启了线程（具体的请参见： http://www.cnblogs.com/ghj1976/archive/2011/05/06/2038516.html 这篇文章）
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