Android学习笔记（一）——简单的控件和基本响应:鼠标事件的响应

鼠标事件响应方式1：

java文件

package com.shine.night;

import android.app.Activity;
import android.os.Bundle;

import android.graphics.Color;

import android.widget.Button;
import android.widget.TextView;

import android.view.View;
import android.view.View.OnClickListener;

import android.util.Log;

public class MainActivity extends Activity
{
    private static final String TAG = "TestEvent1";
    public MainActivity() {}
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final TextView text = ( TextView ) findViewById ( R.id.text );
        final Button btn1 = ( Button ) findViewById ( R.id.button1 );
        final Button btn2 = ( Button ) findViewById ( R.id.button2 );
        
        btn1.setOnClickListener ( new OnClickListener ()
        {
            public void onClick ( View v )
            {
                text.setBackgroundColor ( Color.RED );
            }
        });
        
        btn2.setOnClickListener ( new OnClickListener ()
        {
            public void onClick ( View v )
            {
                text.setBackgroundColor ( Color.GREEN );
            }
        });
        
    }
}

xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView 
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:textSize="24sp"
    android:text="@string/text" />
<Button 
    android:id="@+id/button1"
    android:layout_width="80sp"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:text="@string/red"/>
<Button
    android:id="@+id/button2"
    android:layout_width="80sp"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:text="@string/green"/>   
</LinearLayout>

stringxml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">MainActivity</string>
    <string name="red">Red</string>
    <string name="green">Green</string>
    <string name="text">Text</string>
</resources>

鼠标响应方式2：（与1有相同的布局文件和文本文件）

package com.shine.night;

import android.app.Activity;
import android.os.Bundle;

import android.graphics.Color;

import android.widget.Button;
import android.widget.TextView;

import android.view.View;
import android.view.View.OnClickListener;

import android.util.Log;

public class MainActivity extends Activity implements OnClickListener
{
    private static final String TAG = "TestEvent1";
    public MainActivity() {}
    /** Called when the activity is first created. */
     private TextView text;
     private Button btn1;
     private Button btn2;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        text = ( TextView ) findViewById ( R.id.text );
        btn1 = ( Button ) findViewById ( R.id.button1 );
        btn1.setOnClickListener(this);
        btn2 = ( Button ) findViewById ( R.id.button2 );
        btn2.setOnClickListener(this);
        
      }
        public void onClick ( View v )
      {
          switch ( v.getId () )
          {
              case R.id.button1:
                  text.setBackgroundColor ( Color.RED );
                  break;
              case R.id.button2:
                  text.setBackgroundColor ( Color.GREEN );
                  break;
              default:
                  break;
          }
      }
}