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：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    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：

<?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：

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：

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;    }}

效果如下：