android圆形图库？

Question

我是android开发的新手.现在我想将图库视图像下面的图像那样圆形.事情是我想在用户从左到右和从右到左滚动时放大中心图像.那有什么教程吗？

我想要的是被刷过的图像需要在它的中心放大.我以为我可以用画廊来做.但Android开发人员的例子不是我想要的.:(

Answer 1

你可以试试:

public class TestGallery extends Activity {
/** Called when the activity is first created. */
private Integer[] mImageIds = { R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4 }; 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Gallery g = (Gallery) findViewById(R.id.gallery); 
    g.setAdapter(new ImageAdapter(this)); 

    g.setOnItemClickListener(new OnItemClickListener() { 
        public void onItemClick(AdapterView parent, View v, int position, long id) { 
            if (position >= mImageIds.length) { 
                position = position % mImageIds.length; 
            } 
            Toast.makeText(TestGallery.this, "" + position, Toast.LENGTH_SHORT).show(); 
        } 
    }); 

}

public class ImageAdapter extends BaseAdapter { 
    int mGalleryItemBackground; 
    private Context mContext; 

    public ImageAdapter(Context c) { 
        mContext = c; 
        TypedArray a = obtainStyledAttributes(R.styleable.Gallery1); 
        mGalleryItemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0); 

        a.recycle(); 
    } 

    public int getCount() { 
        return Integer.MAX_VALUE; 
    } 

    public Object getItem(int position) { 
        if (position >= mImageIds.length) { 
            position = position % mImageIds.length; 
        } 
        return position; 
    } 

    public long getItemId(int position) { 
        if (position >= mImageIds.length) { 
            position = position % mImageIds.length; 
        } 
        return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
        ImageView i = new ImageView(mContext); 
        if (position >= mImageIds.length) { 
            position = position % mImageIds.length; 
        } 
        i.setImageResource(mImageIds[position]); 
        i.setLayoutParams(new Gallery.LayoutParams(80, 80)); 
        i.setScaleType(ImageView.ScaleType.FIT_XY); 
        i.setBackgroundResource(mGalleryItemBackground); 
        return i; 
    } 

    public int checkPosition(int position) { 
        if (position >= mImageIds.length) { 
            position = position % mImageIds.length; 
        } 
        return position; 
    } 
}}

Answer 2

如果要放大中心选择的图像,有一种可能的方法.在onItemSelected方法上,只需调用动画即可缩放对象.画廊的特点是它始终是中心锁定的.因此将始终选择中心元素.希望能有效..

<?xml version="1.0" encoding="utf-8"?>
<set
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false"
    android:fillAfter="true"
>
<scale 
       android:fromXScale="1.0"
       android:toXScale="1.50"
       android:fromYScale="1.0"
       android:toYScale="1.50"
       android:duration="600"
       android:pivotX="50%"
       android:pivotY="50%"
       android:fillAfter="true"/>

</set>

请记住,您必须存储前一个视图,因为当元素远离中心时,它应该被置于正常大小.

所以你可以有两个视图 - prevView和currView.
在currView上做动画.

谢谢,
森