Gallery的使用(一)

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Gallerty组件一般用于显示图像列表，Gallery只能水平显示一行，而且支持水平滑动效果。单击、选中或拖动Gallerty中的图像，Gallery中的图像列表会根据不同的情况向左或向右移动，直到显示到最后一个图像为止。

package com.example.androidtest;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.content.res.TypedArray;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {Integer[] imageIDs = {R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher};public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Gallery gallery = (Gallery)findViewById(R.id.gallery1);gallery.setAdapter(new ImageAdapter(this));gallery.setOnItemClickListener(new OnItemClickListener() {public void onItemClick(AdapterView<?> parent, View v, int position, long id){Toast.makeText(getBaseContext(), "pic" + (position + 1) + " selected", Toast.LENGTH_SHORT).show();ImageView imageView = (ImageView)findViewById(R.id.image1);imageView.setImageResource(imageIDs[position]);}});}public class ImageAdapter extends BaseAdapter{private Context context;private int itemBackground;public ImageAdapter(Context c){context = c;TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);itemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);a.recycle();}public int getCount(){return imageIDs.length;}public Object getItem(int position){return position;}public long getItemId(int position){return position;}public View getView(int position, View convertView, ViewGroup parent){ImageView imageView = new ImageView(context);imageView.setImageResource(imageIDs[position]);imageView.setScaleType(ImageView.ScaleType.FIT_XY);imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));imageView.setBackgroundResource(itemBackground);return imageView;}}}

在res/values下添加styleable.xml文件：

<?xml version="1.0" encoding="UTF-8"?><resources>     <declare-styleable name="Gallery1">         <attr name="android:galleryItemBackground" />     </declare-styleable> </resources>

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"       android:text="Images of San Francisco"/>    <Gallery        android:id="@+id/gallery1"        android:layout_width="fill_parent"        android:layout_height="wrap_content"/>    <ImageView        android:id="@+id/image1"        android:layout_width="320px"        android:layout_height="250px"        android:scaleType="fitXY"/>        </LinearLayout>

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