随着智能手机的兴起,安卓培训也成为目前IT培训的热门,安卓培训出来的学员也是高新的代表,那么,安卓培训都讲些什么呢?下面就让湖北安卓培训授权中心——北大青鸟武汉宏鹏鲁广校区老师为我们解读:Android三种实现定时器的方法
方法一:Handler+Thread
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758 | package com.xunfang.handerDemo;
import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.widget.TextView;
/**
* handler定时器
*
* @author Smalt
*
*/ public class HanderDemoActivity extends Activity {
TextView tvShow;
private int i = 0 ;
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
tvShow = (TextView) findViewById(R.id.tv_show);
new Thread( new ThreadShow()).start();
}
// handler类接收数据
Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 1 ) {
tvShow.setText(Integer.toString(i++));
System.out.println( "receive...." );
}
};
};
// 线程类
class ThreadShow implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
while ( true ) {
try {
Thread.sleep( 1000 );
Message msg = new Message();
msg.what = 1 ;
handler.sendMessage(msg);
System.out.println( "send..." );
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println( "thread error..." );
}
}
}
} } |
方法二:Handler类自带的postDelyed
123456789101112131415161718192021222324252627282930313233343536373839404142434445 | package com.xunfang.handerDemo;
import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.widget.TextView;
/**
* handler定时器使用postDelyed实现
*
* @author Smalt
*
*/ public class HanderDemoActivity extends Activity {
TextView tvShow;
private int i = 0 ;
private int TIME = 1000 ;
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
tvShow = (TextView) findViewById(R.id.tv_show);
handler.postDelayed(runnable, TIME); //每隔1s执行
}
Handler handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
// handler自带方法实现定时器
try {
handler.postDelayed( this , TIME);
tvShow.setText(Integer.toString(i++));
System.out.println( "do..." );
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println( "exception..." );
}
}
};
} |
方法三:
Handler+Timer+TimerTask
package com.xunfang.handerDemo;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;
/**
* 定时器实现:Handler+Timer+TimerTask
*
* @author Smalt
*
*/
public class HanderDemoActivity extends Activity {
TextView tvShow;
private int i = 0;
private int TIME = 1000;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvShow = (TextView) findViewById(R.id.tv_show);
timer.schedule(task, 1000, 1000); // 1s后执行task,经过1s再次执行
}
Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 1) {
tvShow.setText(Integer.toString(i++));
}
super.handleMessage(msg);
};
};
Timer timer = new Timer();
TimerTask task = new TimerTask() {
@Override
public void run() {
// 需要做的事:发送消息
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
};
}
- 武汉android培训课程:Android三种实现定时器的方法
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本文标题:#武汉android培训课程:Android三种实现定时器的方法#,宏鹏发布于北大青鸟鲁广校区。 随着智能手机的兴起,安卓培训也成为目前IT培训的热门,安卓培训出来的学员也是高新的代表,那么,安卓培训都讲些什么呢?下面就让湖北安卓培训授权中心——北大青鸟武汉