Android中使用定時器的三種方法

本文實例爲你們分享了Android中使用定時器的三種方法，供你們參考，具體內容以下

由於都比較簡單,因此就直接貼代碼(慮去再次點擊中止的操做),有個全局的Handler負責接收消息更新UI

第一種方法: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(); }

第二種方法: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);     }

第三種: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);

總的來講第三種方法最方便,不易出錯,第二種容易忘記添加出發事件.

貼一下完整代碼：

佈局文件

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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);       //收到消息後顯示當前時間       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;     }   } }