Detailed explanation and implementation methods of three types of timers in Android

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This article mainly introduces the knowledge of Android timer. Here are three methods to implement the timer. Friends in need can refer to it.

Method 1: 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 timer
 *
 * @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();
 } 
   
 // The handler class receives data
 Handler handler = new Handler() {
  public void handleMessage(Message msg) {
 if ( msg.what == 1 ) {
    tvShow.setText(Integer.toString(i++));
    System.out.println("receive....");
 }
 };
 }; 
   
 //Thread class
 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...");
 }
 }
 }
 }
 }

Method 2: postDelyed of the Handler class

 package com.xunfang.handerDemo; 
   
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.widget.TextView; 
   
 /**
 * The handler timer is implemented using postDelyed
 *
 * @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); //Execute every 1s
 } 
   
 Handler handler = new Handler();
 Runnable runnable = new Runnable() { 
   
 @Override
 public void run() {
 // The handler comes with its own method to implement the timer
 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...");
 }
 }
 }; 
   
 }

Method 3: 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; 
   
 /**
 * Timer implementation: 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); // Execute task after 1s, and execute again after 1s
 } 
   
 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() {
 // What needs to be done: send a message
   Message message = new Message();
 message.what = 1 ;
   handler.sendMessage(message);
 }
 };
 }

The above is the summary of the Android timer information. I will continue to add relevant knowledge in the future. Thank you for your support!