Android学习笔记07：Handler的使用一

[Android开发视频教学].01_14_Handler（一）之一 学习使用Handler

这是一个简单的案例，点击开始，下面的数开始自动加一，点击结束，数值恢复为0，可以再点击开始，再次计数

xml

<LinearLayout 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:orientation="vertical"
     >

    <LinearLayout android:id="@+id/linear"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="10dp" >

        <Button
            android:id="@+id/startButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/startButton" />

        <Button
            android:id="@+id/endButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/endButton" />
    </LinearLayout>
	<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="@string/add" />
    <TextView
        android:id="@+id/number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="@string/intAdd"
        android:gravity="right" />

</LinearLayout>

java

package fengda.android10;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class Activity10 extends Activity {
	
	private Button startButton;
	private Button endButton;
	private TextView number;
	private Handler handler = new Handler();
	private int i = 0;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activity10);
        
        startButton = (Button) findViewById(R.id.startButton);
        startButton.setOnClickListener( new StartButtonListener() );
        
        endButton = (Button) findViewById(R.id.endButton);
        endButton.setOnClickListener( new EndButtonListener() );
        
        number = (TextView) findViewById(R.id.number);
    }

    class StartButtonListener implements OnClickListener {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			handler.post(addThread);
		}
    	
    }
    
    class EndButtonListener implements OnClickListener {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			i=0;
			number.setText(i+"");
			handler.removeCallbacks(addThread);
		}
    	
    }
    
    Runnable addThread = new Runnable(){

		@Override
		public void run() {
			// TODO Auto-generated method stub
			i++;
			number.setText(i+"");
			handler.postDelayed(addThread, 1000);
		}
    	
    };
}

string

<resources>

    <string name="app_name">Android10</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_activity10">Activity10</string>
	<string name="startButton">开始</string>
	<string name="endButton">结束</string>
	<string name="add">每秒数值自动加1：</string>
	<string name="intAdd">0</string>
	
</resources>