Android Gallery自定义风格

图片浏览gallery控件自定义风格，即加上灰色边框：

1、main.xml文件如下：

[java]
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="www.zzzyk.com"
    android:id="@+id/widget0"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<Gallery
    android:id="@+id/Gallery"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    />
</RelativeLayout>

2、attrs.xml文件如下：

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

3、Activity代码如下：

[java]
public class gallery extends Activity {
    private int size;
    private List<Drawable> list = new ArrayList<Drawable>();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //全屏
        requestWindowFeature(Window.FEATURE_NO_TITLE);
       getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);

        final Object data = getLastNonConfigurationInstance();
        if(data == null){
            getImage();
        }else{
            list = (List<Drawable>) data;
        }

        final Gallery g = (Gallery) findViewById(R.id.Gallery);
        g.setAdapter(new ImageAdapter(this,list));
        //默认显示Gallery的中间一个图片
        g.setSelection(size/2);
    }

    @Override
    public Object onRetainNonConfigurationInstance() {
        return list;
    }

    //获取系统应用的图标
    private List<Drawable> getImage(){
        PackageManager packageManager = this.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> infos = packageManager.queryIntentActivities(intent, 0);
        for(ResolveInfo info : infos){
            ActivityInfo ai = info.activityInfo;
            Drawable icon = ai.loadIcon(packageManager);
            list.add(icon);
       }
       return list;
    }
}

4、适配器代码如下：

[java]
public class ImageAdapter extends BaseAdapter {
    int mGalleryItemBackGround;
    private Context mContext;
    private List<Drawable> list;
    public ImageAdapter(Context mContext,List<Drawable> li) {
        this.mContext = mContext;
        this.list = li;
        TypedArray a = mContext.obtainStyledAttributes(R.styleable.Gallery1);
        mGalleryItemBackGround = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
        a.recycle();
    }

    public int getCount() {
        return list.size();
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        // 声明一个ImageView对象
        ImageView i = new ImageView(mContext);
        BitmapFactory.Options options = new BitmapFactory.Options();
        //设置图片的大小，宽高都为原来的二分之一，即图片为原来的四分之一
        options.inSampleSize = 2;
        i.setImageDrawable(list.get(position));
        //设置layout的宽高
        i.setLayoutParams(new Gallery.LayoutParams(200,200));//layout
        //重新设置图片的宽高
        i.setScaleType(ImageView.ScaleType.FIT_XY);//set scale type
        //设置图片的背景，即自定义的背景风格
        i.setBackgroundResource(mGalleryItemBackGround);
        return i;
    }
    class ViewHolder{
        ImageView image;
    }
}

作者：huweilong1030

补充：移动开发 , Android ,