Android入门之ImageView的使用方法

效果图：

MainActivity.java

package com.jk.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class MainActivity extends Activity {

	ImageView imageView1;
	ImageView imageView2;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		imageView1 = (ImageView)findViewById(R.id.imageView1Id);
		imageView2 = (ImageView)findViewById(R.id.imageView2Id);
		
		imageView1.setScaleType(ScaleType.CENTER);
		imageView2.setScaleType(ScaleType.FIT_CENTER);
		
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

<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"
    tools:context=".MainActivity" >

   <ImageView 
       android:id="@+id/imageView1Id"
       android:layout_width="100dp"
       android:layout_height="100dp"
       android:src="@drawable/boy"
       android:background="#FF0000"
       android:scaleType="centerCrop"/>
   
   <ImageView 
       android:id="@+id/imageView2Id"
       android:layout_width="100dp"
       android:layout_height="100dp"
       android:src="@drawable/ic_launcher"
       android:background="#00FF00"
       android:scaleType="centerCrop"/>
	   
</LinearLayout>