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mainActiviy
package com.example.mygallary;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
public class MainActivity extends Activity {
Gallery gal;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageAdapter adapter=new ImageAdapter(this);
gal=(Gallery)findViewById(R.id.gal);
gal.setAdapter(adapter);
gal.setSelection(Integer.MAX_VALUE/2);
}
public class ImageAdapter extends BaseAdapter{
Context context=null;
int mGalleryItemBackground;
public ImageAdapter(Context context){
this.context=context;
TypedArray a = obtainStyledAttributes(R.styleable.HelloGallery);//加载资源文件
mGalleryItemBackground = a.getResourceId(
R.styleable.HelloGallery_android_galleryItemBackground, 0);//设置Gallery的背景布局
a.recycle();
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return Integer.MAX_VALUE;
}
int ids[]={R.drawable.s1,R.drawable.s2,R.drawable.s3,R.drawable.s4,R.drawable.s5,R.drawable.s6};
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return ids[position%6];
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position%6;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView=null;
if(convertView==null){
imageView=new ImageView(context);
convertView=imageView;
}
imageView.setImageResource(ids[position%6]);
imageView.setBackgroundResource(mGalleryItemBackground);
imageView.setLayoutParams(new Gallery.LayoutParams(260,220));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
return imageView;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
values 包下attr.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="HelloGallery">
<attr name="android:galleryItemBackground" />
</declare-styleable>
</resources>drawable包下6张图片S1 S2…
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