Android三种实现定时器的方法
16lz
2021-01-23
Android三种实现定时器的方法
方法一:Handler+Thread
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;@Overridepublic 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 {@Overridepublic void run() {// TODO Auto-generated method stubwhile (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 blocke.printStackTrace();System.out.println("thread error...");}}}}}方法二:Handler类自带的postDelyed
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;@Overridepublic 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() {@Overridepublic 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 blocke.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;@Overridepublic 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() {@Overridepublic void run() {// 需要做的事:发送消息Message message = new Message();message.what = 1;handler.sendMessage(message);}};}更多相关文章
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