Android定时器实现定时执行、重复执行、定时重复执行、定次数执行的多种方式

作用：

1、定时执行某种功能

2、重复执行、定时重复执行、定次数执行某种功能

类别：

1、 Thread(new Runnable)

2、Thread()

3、Timer

4、Handler

·····

代码如下：

1、布局

2、实现定时功能

package com.example.leixiansheng.mytimers;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity implements View.onClickListener {
  private Button timer_1, timer_2, timer_3, timer_4,clear, showTime;
  private Timer timer;
  private TimerTask timerTask;
  private int num = 0;    //计数值
  private boolean flog = true;    //是否停止计时
  private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      showTime.setText("点击我停止计时： " + msg.what);
    }
  };
  //handler 方式定时循环
  private Handler handlerTimer = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      if (flog) {
 handlerTimer.sendEmptyMessageDelayed(num++, 1000);
      }
      showTime.setText("点击我停止计时： " + msg.what);
      if(flog == false) {
flog = true;
      }
    }
  };
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    timer_1 = (Button) findViewById(R.id.timer_1);
    timer_2 = (Button) findViewById(R.id.timer_2);
    timer_3 = (Button) findViewById(R.id.timer_3);
    timer_4 = (Button) findViewById(R.id.timer_4);
    clear = (Button) findViewById(R.id.clear);
    showTime = (Button) findViewById(R.id.show_time);
    timer_1.setonClickListener(this);
    timer_2.setonClickListener(this);
    timer_3.setonClickListener(this);
    timer_4.setonClickListener(this);
    clear.setonClickListener(this);
    showTime.setonClickListener(this);
  }
  @Override
  public void onClick(View view) {
    switch (view.getId()) {
      case R.id.timer_1:
 method_1();
 break;
      case R.id.timer_2:
 method_2();
 break;
      case R.id.timer_3:
 method_3();
 break;
      case R.id.timer_4:
 method_4();
 break;
      case R.id.clear:
 num = 0;
 showTime.setText("请选择一种启动方式");
 break;
      case R.id.show_time:
 flog = false;
 break;
    }
  }
  private void method_4() {
      new Thread() {
 @Override
 public void run() {
   super.run();
   handlerTimer.sendEmptyMessage(num++);
 }
      }.start();
  }
  private void method_3() {
    //Timer一旦被cancel之后就废了，只有重新构造一个。
    if (flog == true) {
      timer = new Timer();
      timerTask = new TimerTask() {
 @Override
 public void run() {
   handler.sendEmptyMessage(num++);
 }
      };
      
      timer.schedule(timerTask, 0, 1000);
    } else {
      timer.cancel();
      // 一定设置为null，否则定时器不会被回收
      timer = null;
      flog = true;
    }
    //Timer 暂停重启有问题（待改进）
    //Timer一旦被cancel之后就废了，只有重新构造一个。
//    if (flog == true) {
//      timerTask = new TimerTask() {
// @Override
// public void run() {
//   handler.sendEmptyMessage(num++);
// }
//      };
//      
//      timer.schedule(timerTask, 0, 1000);
//    } else {
//      timer.cancel();
//      flog = true;
//    }
  }
  private void method_2() {
    //new Thread().start();
    new Thread() {
      @Override
      public void run() {
 super.run();
 while (flog) {
   handler.sendEmptyMessage(num++);
   try {
     Thread.sleep(1000);
   } catch (InterruptedException e) {
     e.printStackTrace();
   }
 }
      }
    }.start();
    flog = true;
  }
  private void method_1() {
//    new Thread(new Runnable).start();
    new Thread(new Runnable() {
      @Override
      public void run() {
 while (flog) {
   handler.sendEmptyMessage(num++);
   try {
     Thread.sleep(1000);
   } catch (InterruptedException e) {
     e.printStackTrace();
   }
 }
      }
    }).start();
    flog = true;
  }
}

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