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说明：
两种方法实现android定时器，定时执行任务

第一种方式：
step1：

package com.example.iosdialogdemo;import android.os.Bundle;
import android.os.Handler;import androidx.appcompat.app.AppCompatActivity;import java.util.Timer;public class TimerActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_same);Timer timer = new Timer();timer.schedule(new MyTimerTask(), 0, 1000);}
}

step2：

package com.example.iosdialogdemo;import java.util.TimerTask;public class MyTimerTask extends TimerTask {@Overridepublic void run() {System.out.println("this timer click");}
}

第二种方式
step1:

package com.example.iosdialogdemo;import android.os.Bundle;
import android.os.Handler;import androidx.appcompat.app.AppCompatActivity;public class TimerActivity extends AppCompatActivity {private final int Time = 1000;    //时间间隔，   单位 msprivate int N = 0;      //用来观测重复执行private Handler handler = new Handler();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_same);handler.postDelayed(new Runnable() {@Overridepublic void run() {handler.postDelayed(this, Time);//每隔一段时间要重复执行的代码N = N + 1;System.out.println("第" + N + "次执行");}}, Time);	//启动计时器}}

第三种方式：

package com.example.iosdialogdemo;import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;import androidx.appcompat.app.AppCompatActivity;import java.util.Timer;public class TimerActivity extends AppCompatActivity {private static Handler mHandler = new Handler(Looper.getMainLooper()) {@Overridepublic void handleMessage(Message msg) {System.out.println("this timer click");try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}mHandler.sendEmptyMessage(0);}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_same);mHandler.sendEmptyMessage(0);}}

end