Android开发入门 Button事件实现的方法(原创)

下面介绍Button事件实现的三种方法

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.64"
        android:orientation="vertical" >

        <EditText
            android:id="@+id/editText1"
            android:layout_width="248dp"
            android:layout_height="wrap_content" >

            <requestFocus />
        </EditText>


        <EditText
            android:id="@+id/editText2"
            android:layout_width="248dp"
            android:layout_height="wrap_content" />

        <DatePicker
            android:id="@+id/datePicker1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="测试按钮" android:clickable="false"/>
    </LinearLayout>
</LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, HelloWordActivity!</string>
    <string name="app_name">HelloWord</string>
</resources>

第一种:

HelloWordActivity.java

package xyq.Android;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Button;
import android.widget.Toast;
import android.view.View.OnClickListener;
//import android.widget.TextView

public class HelloWordActivity extends Activity
{
    /** Called when the activity is first created. */
        
    private Button btn1;
    @Override
    public void onCreate(Bundle abc)
    {
        super.onCreate(abc);
        
        /*TextView tv=new TextView(this);
        tv.setText("你好,安卓!");
        Button btn=new Button(this);
        //btn.setWidth(150);
        btn.setText("按钮1");
        btn.setTextColor(Color.GREEN);
        Button btn2=new Button(this);
        btn2.setText("按钮2");
        LinearLayout layout=new LinearLayout(this);
        layout.addView(tv);
        layout.addView(btn);
        layout.addView(btn2);
        this.setContentView(layout);*/
        
        setContentView(R.layout.main);
        
        btn1=(Button)findViewById(R.id.button1);

        //使用匿名类注册Button事件 
        btn1.setOnClickListener(new OnClickListener  ()
        {
            //这是错误的方法,on,不是On
            public void OnClick(View v)
            {
                Toast.makeText(HelloWordActivity.this, "你点击了按钮1",Toast.LENGTH_LONG).show();
            }

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(HelloWordActivity.this, "你点击了按钮1",Toast.LENGTH_LONG).show();
            }
        });
    }

}

第二种:

HelloWordActivity.java

package xyq.Android;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Button;
import android.widget.Toast;
import android.view.View.OnClickListener;
//import android.widget.TextView

public class HelloWordActivity extends Activity
{
    /** Called when the activity is first created. */
        
    private Button btn1;
    @Override
    public void onCreate(Bundle abc)
    {
        super.onCreate(abc);
        
        /*TextView tv=new TextView(this);
        tv.setText("你好,安卓!");
        Button btn=new Button(this);
        //btn.setWidth(150);
        btn.setText("按钮1");
        btn.setTextColor(Color.GREEN);
        Button btn2=new Button(this);
        btn2.setText("按钮2");
        LinearLayout layout=new LinearLayout(this);
        layout.addView(tv);
        layout.addView(btn);
        layout.addView(btn2);
        this.setContentView(layout);*/

       
        setContentView(R.layout.main);
        btn1.setOnClickListener(new ButtonClick());      
    }
    

    //创建一个类,来响应OnClickListener  
    class ButtonClick implements OnClickListener

    {
         public void onClick(View v)  
         {  
             switch (v.getId()) {  
             case R.id.button1:  
                 Toast.makeText(HelloWordActivity.this, "你点击了按钮1",Toast.LENGTH_LONG).show();  
                 break;  
             default:  
                 break;  
             }  
         }         
    }
}

 

第三种:

Button控件有一个叫onClick的属性(在属性面板里叫“On Click”)。你可以通过这个属性设置要处理点击事件的方法名,然后在你的活动中实现这个方法。比如,你可以将你的Button控件属性设置为 onButtonClick。在XML中,这个属性将如下所示:

android:onClick="onButtonClick"

然后,在你的活动类,你需要实现这个方法。它应该是一个带有单个参数(一个View对象)的公有的void方法。例如,下面的按钮点击实现了当Button控件被点击时在屏幕生成一个消息框:

package xyq.Android;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Button;
import android.widget.Toast;
import android.view.View.OnClickListener;
//import android.widget.TextView

public class HelloWordActivity extends Activity
{
    /** Called when the activity is first created. */
        
    private Button btn1;
    @Override
    public void onCreate(Bundle abc)
    {
        super.onCreate(abc);
        
        /*TextView tv=new TextView(this);
        tv.setText("你好,安卓!");
        Button btn=new Button(this);
        //btn.setWidth(150);
        btn.setText("按钮1");
        btn.setTextColor(Color.GREEN);
        Button btn2=new Button(this);
        btn2.setText("按钮2");
        LinearLayout layout=new LinearLayout(this);
        layout.addView(tv);
        layout.addView(btn);
        layout.addView(btn2);
        this.setContentView(layout);*/
        
        setContentView(R.layout.main);
    }
    
    public void onButtonClick(View view)
    {
        Toast.makeText(this, "你点击了按钮1", Toast.LENGTH_SHORT).show();
    }
}



 

posted @ 2011-12-07 13:43  怡馨  阅读(601)  评论(0编辑  收藏  举报