9. android Gallery(画廊)以及BaseAdapter _ぴちぴち画廊r-优快云博客

本文介绍了一个简单的 Android 应用示例，使用 Gallery 控件展示图片，并实现了点击切换图片的功能。通过 XML 布局文件和 Java 代码展示了 Gallery 的基本用法。

目录结构

第一步：

/GalleryDemo/res/layout/gallery_layout.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" android:layout_gravity="center">  <Gallery android:id="@+id/gallery" android:layout_width="fill_parent" android:layout_height="fill_parent" android:spacing="10dip" android:unselectedAlpha="1" /> </LinearLayout>

第二步：

/GalleryDemo/src/com/mygallery/activity/GalleryActivity.java

package com.mygallery.activity; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.AdapterView.OnItemClickListener; public class GalleryActivity extends Activity { int[] imgIds = {R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.gallery_layout); Gallery gallery = (Gallery) findViewById(R.id.gallery); BaseAdapter adapter = new GalleryAdpter(); gallery.setAdapter(adapter); OnItemClickListener listener = new OnItemClickListener() { /* * parent 发生点击动作的AdapterView * view 在AdapterView中被点击的视图(它是由adapter提供的一个视图) * position 视图在adapter中的位置 * id 被点击元素的行id */ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Gallery gallery = (Gallery) findViewById(R.id.gallery); gallery.setSelection(position); } }; gallery.setOnItemClickListener(listener); } class GalleryAdpter extends BaseAdapter { @Override public int getCount() { return imgIds.length; } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView = new ImageView(GalleryActivity.this); imageView.setImageResource(imgIds[position]); imageView.setScaleType(ImageView.ScaleType.FIT_XY); return imageView; } } }

第三步：

/GalleryDemo/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.mygallery.activity" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".GalleryActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-sdk android:minSdkVersion="8" /> </manifest>

效果图：