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Android入门第十二篇之Gallery

2011-01-10

Android的Gallery控件是个很不错的看图控件,大大减轻了开发者对于看图功能的开发,而且效果也比较美观。本文介绍Gallery的用法,用反射机制来动态读取资源中的图片。        本文的效果图: main.xml

Android的Gallery控件是个很不错的看图控件,大大减轻了开发者对于看图功能的开发,而且效果也比较美观。本文介绍Gallery的用法,用反射机制来动态读取资源中的图片。

本文的效果图:

\

main.xml源码:

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<?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"
>
<Gallery android:id="@+id/gallery" android:layout_height="fill_parent" android:layout_width="fill_parent"></Gallery>
</LinearLayout>
<?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"
>
<Gallery android:id="@+id/gallery" android:layout_height="fill_parent" android:layout_width="fill_parent"></Gallery>
</LinearLayout>

程序源码:

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package com.testImageView;

import java.lang.reflect.Field;
import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
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 testImageView extends Activity {
private Gallery mGallery;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

mGallery = (Gallery)findViewById(R.id.gallery);
try {
mGallery.setAdapter(new ImageAdapter(this));
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mGallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
testImageView.this.setTitle(String.valueOf(position));
}
});
}

/*
* class ImageAdapter is used to control gallery source and operation.
*/
private class ImageAdapter extends BaseAdapter{
private Context mContext;
private ArrayList<Integer> imgList=new ArrayList<Integer>();
private ArrayList<Object> imgSizes=new ArrayList<Object>();
public ImageAdapter(Context c) throws IllegalArgumentException, IllegalAccessException{
mContext = c;

//用反射机制来获取资源中的图片ID和尺寸
Field[] fields = R.drawable.class.getDeclaredFields();
for (Field field : fields)
{
if (!"icon".equals(field.getName()))//除了icon之外的图片
{
int index=field.getInt(R.drawable.class);
//保存图片ID
imgList.add(index);
//保存图片大小
int size[]=new int[2];
Bitmap bmImg=BitmapFactory.decodeResource(getResources(),index);
size[0]=bmImg.getWidth();size[1]=bmImg.getHeight();
imgSizes.add(size);
}
}
}
@Ove

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