Android中使用定时器的三种方法

本文实例为大家分享了Android中使用定时器的三种方法，供大家参考，具体内容如下

图示:


 

 

因为都比较简单,所以就直接贴代码(虑去再次点击停止的操作),有个全局的Handler负责接收消息更新UI

第一种方法:Thread.sleep();方法

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Runnable runnable = new Runnable() {
    @Override
  public void run() {
   while (true) {
   mHandler.sendEmptyMessage(0);
 try {
   Thread.sleep(1000);
  } catch (InterruptedException e) {
    e.printStackTrace();
     }
     }
    }
   };
new Thread(runnable).start();
}

第二种方法:Handler的postDelay()方法

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final Runnable runnable = new Runnable() {
      @Override
      public void run() {
        if (isStart2) {
          mHandler.sendEmptyMessage(0);
          mHandler.postDelayed(this, 1000);
        }
      }
    };
mHandler.postDelayed(runnable, 1000);
    }

第三种:Timer和TimerTask

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private Timer timer = new Timer();
 private TimerTask timerTask = new TimerTask() {
   @Override
   public void run() {
     mHandler.sendEmptyMessage(0);
   }
 };
timer.schedule(timerTask, 1000, 1000);

总的来说第三种方法最方便,不易出错,第二种容易忘记添加出发事件.

贴一下完整代码：

布局文件

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context="com.brioal.timertest.MainActivity">
 
  <TextView
    android:id="@+id/main_tv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="100dp"
    android:text="Hello World!" />
 
  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/main_tv"
    android:layout_marginTop="100dp"
    android:gravity="center"
    android:orientation="vertical">
 
    <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:layout_margin="5dp"
      android:onClick="Method1"
      android:text="方法1:Thread"
      android:textAllCaps="false" />
 
    <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:layout_margin="5dp"
      android:onClick="Method2"
      android:text="方法2:Handler"
      android:textAllCaps="false" />
 
    <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:layout_margin="5dp"
      android:onClick="Method3"
      android:text="方法3:Task"
      android:textAllCaps="false" />
  </LinearLayout>
</RelativeLayout>

MainActivity

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package com.brioal.timertest;
 
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
 
import java.text.SimpleDateFormat;
import java.util.Timer;
import java.util.TimerTask;
 
public class MainActivity extends AppCompatActivity {
  private TextView mTv;
  private Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      //收到消息后显示当前时间
      long current = System.currentTimeMillis();
      SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
      String time = dateFormat.format(current);
      mTv.setText(time);
    }
  };
  private Timer timer = new Timer();
  private TimerTask timerTask = new TimerTask() {
    @Override
    public void run() {
      mHandler.sendEmptyMessage(0);
    }
  };
  private Thread thread1;
  private boolean isStart1 = false;
  private boolean isStart2 = false;
  private boolean isStart3 = false;
 
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mTv = (TextView) findViewById(R.id.main_tv);
  }
 
  //Thread方法
  public void Method1(View view) {
    Runnable runnable = new Runnable() {
      @Override
      public void run() {
        while (isStart1) {
          mHandler.sendEmptyMessage(0);
          try {
            Thread.sleep(1000);
 
          } catch (InterruptedException e) {
            e.printStackTrace();
          }
        }
 
      }
    };
    if (isStart1) {
      isStart1 = false;
    } else {
      isStart1 = true;
      thread1 = new Thread(runnable);
      thread1.start();
    }
  }
 
  public void Method2(View view) {
 
    final Runnable runnable = new Runnable() {
      @Override
      public void run() {
        if (isStart2) {
          mHandler.sendEmptyMessage(0);
          mHandler.postDelayed(this, 1000);
        }
      }
    };
    if (isStart2) {
      isStart2 = false;
    } else {
      mHandler.postDelayed(runnable, 1000);
      isStart2 = true;
    }
  }
 
  public void Method3(View view) {
    if (isStart3) {
      timer.cancel();
      isStart3 = false;
    } else {
      timer.schedule(timerTask, 1000, 1000);
      isStart3 = true;
    }
  }
}

总结完了,完整Github地址:TimerTest

以上就是定时器使用方法的全部内容，希望能给大家一个参考，也希望大家多多支持脚本之家。

posted @ 2016-12-02 15:39  天涯海角路  阅读(288)  评论(0)    收藏  举报