Android 电子相册http://blog.sina.com.cn/s/blog_9968251c01014uu9.html
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基本思路
gallery选中的图片在ImageView中显示出来，注意ImageView的一个View实际上就是一个ImageView，gllery的一个View也是一个ImageView。
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关键代码
对于Gallery
1. 相册循环
public int getCount() {
return Integer.MAX_VALUE; //通过这个来进行循环
}
2. 制作View
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView image=new ImageView(context);
image.setImageResource(preImages[position%preImages.length]); //通过这个来进行循环
image.setScaleType(ImageView.ScaleType.FIT_XY);
image.setLayoutParams(new Gallery.LayoutParams(200, 120));
image.setBackgroundResource(typedArray.getResourceId(R.styleable.Gallery_android_galleryItemBackground, 0));
return image;
}
3. 设置View的背景
typedArray = obtainStyledAttributes(R.styleable.Gallery);
image.setBackgroundResource(typedArray.getResourceId(R.styleable.Gallery_android_galleryItemBackground, 0));
对于ImageView
1. 设置View
//设置ImageSwitcher中的ImageView
switcher.setFactory(new ViewFactory(){
public View makeView() {
ImageView image=new ImageView(Scan_pic.this);
image.setScaleType(ImageView.ScaleType.FIT_CENTER);
image.setLayoutParams(newImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
return image;
}
});
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完整代码
Gallery相册的每一张相片的背景style的设置：
res/value/attr.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="Gallery">
<attr name="android:galleryItemBackground"/>
</declare-styleable>
</resources>
public class Scan_pic extends Activity {
private ImageSwitcher switcher;
private Gallery gallery;
private int[] preImages;
private int[] afterImages;
private int postion;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.scanpic);
switcher=(ImageSwitcher)findViewById(R.id.imageSwitcher_scan_pic);
gallery=(Gallery)findViewById(R.id.gallery1_scan_pic);
afterImages=new int[]{R.drawable.after0,R.drawable.after1,R.drawable.after2,R.drawable.after3};
preImages=new int[]{R.drawable.pre0,R.drawable.pre1,R.drawable.pre2,R.drawable.pre3};
gallery.setAdapter(new ImageAdapter(preImages,Scan_pic.this));
//设置gallery的项单击事件，更换ImagerSwitcher中的图片
gallery.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
switcher.setImageResource(preImages[arg2%preImages.length]);
postion=arg2%preImages.length;
}
});
//设置ImageSwitcher中的ImageView
switcher.setFactory(new ViewFactory(){
public View makeView() {
// TODO Auto-generated method stub
ImageView image=new ImageView(Scan_pic.this);
image.setScaleType(ImageView.ScaleType.FIT_CENTER);
image.setLayoutParams(newImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
return image;
}
});
switcher.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(Scan_pic.this,StartGame.class);
intent.putExtra("position", postion);
startActivity(intent);
}
});
}
class ImageAdapter extends BaseAdapter{
int[] preImages;
Context context;
TypedArray typedArray;
public ImageAdapter(int[] preImages,Context context){
this.preImages=preImages;
this.context=context;
typedArray = obtainStyledAttributes(R.styleable.Gallery); //设置Gallery中的ImageView即每一项的背景
}
public int getCount() {
// TODO Auto-generated method stub
return Integer.MAX_VALUE; //通过这个来进行循环
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView image=new ImageView(context);
image.setImageResource(preImages[position%preImages.length]); //通过这个来进行循环
image.setScaleType(ImageView.ScaleType.FIT_XY);
image.setLayoutParams(new Gallery.LayoutParams(200, 120));
image.setBackgroundResource(typedArray.getResourceId(R.styleable.Gallery_android_galleryItemBackground, 0));
return image;
}
}
}
http://blog.sina.com.cn/s/blog_9968251c01014uu9.html