4.8 ImageView的使用

package com.chaowen;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class Ex04_07_ImageView extends Activity {
	  
	  private ImageView mImageView01;
	  private ImageView mImageView02;
	  private Button mButton01;
	  private Button mButton02;
	  
	  /** Called when the activity is first created. */
	  @Override
	  public void onCreate(Bundle savedInstanceState)
	  {
	    super.onCreate(savedInstanceState);
	    setContentView(R.layout.main);
	    
	    mImageView01 = (ImageView)findViewById(R.id.myImageView1);
	    mImageView02 = (ImageView)findViewById(R.id.myImageView2);
	    mButton01 = (Button) findViewById(R.id.myButton1);
	    mButton02 = (Button) findViewById(R.id.myButton2);
	    
	    //设置ImageView背景图
	    mImageView01.setImageDrawable(getResources().
	                 getDrawable(R.drawable.right)); 
	    mImageView02.setImageDrawable(getResources().
	                 getDrawable(R.drawable.oa));
	    
	     //用OnClickListener来启动
	    mButton01.setOnClickListener(new Button.OnClickListener()
	    {
	      @Override
	      public void onClick(View v)
	     {
	       //当启动后，ImageView立刻换背景图
	      mImageView01.setImageDrawable(getResources().
	                   getDrawable(R.drawable.right));
	     }
	   });
	    
	    mButton02.setOnClickListener(new Button.OnClickListener()
	    {
	      @Override
	      public void onClick(View v)
	     {
	      mImageView01.setImageDrawable(getResources().
	                   getDrawable(R.drawable.left));
	     }
	   });
	    
	  }
}

   main.xml

  <?xml version="1.0" encoding="utf-8"?>

<AbsoluteLayout
  android:id="@+id/widget34"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  xmlns:android="http://schemas.android.com/apk/res/android"
  >
  <!--建立第一個ImageView -->
  <ImageView
  android:id="@+id/myImageView1"
  android:layout_width="320px"
  android:layout_height="280px"
  android:layout_x="0px"
  android:layout_y="36px"
  />
  <!--建立第二個ImageView -->
  <ImageView
  android:id="@+id/myImageView2"
  android:layout_width="104px"
  android:layout_height="157px"
  android:layout_x="101px"
  android:layout_y="119px"
  />
  <!--建立第一個Button -->
  <Button
  android:id="@+id/myButton1"
  android:layout_width="105px"
  android:layout_height="66px"
  android:text="pic1"
  android:layout_x="9px"
  android:layout_y="356px"
  />
  <!--建立第二個Button -->
  <Button
  android:id="@+id/myButton2"
  android:layout_width="105px"
  android:layout_height="66px"
  android:text="pic2"
  android:layout_x="179px"
  android:layout_y="356px"
  />
</AbsoluteLayout>