Android入門之ImageView的使用方法

：

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;@Overrideprotected 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);}@Overridepublic 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;}}

activity_main.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"    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>