《疯狂安卓讲义》P64 -- 实例：简单图片浏览器
<?xml version="1.0" encoding="utf-8"?>
<!--定义一个线性布局容器-->
android:id="@+id/root"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
</LinearLayout>
public class MainActivity extends AppCompatActivity {
//定义一个访问图片的数组
int[] images = new int[] {
R.drawable.java,
R.drawable.javaee,
R.drawable.swift,
R.drawable.ajax,
R.drawable.html, };
int currentImg = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取LinearLayout布局容器
LinearLayout main = (LinearLayout) findViewById(R.id.root);
//程序创建ImageView组件
final ImageView image = new ImageView(this);
//将ImageView组件添加到LinearLayout布局容器中
main.addView(image);
//初始化时显示第一张图片
image.setImageResource(images[0]);
image.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
//改变ImageView里显示的图片
image.setImageResource(images[++currentImg % images.length]);
}
});
}
}
<?xml version="1.0" encoding="utf-8"?>
package="com.example.zxy.ex2">
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="21"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name">
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>