我正在使用这个 CoverFlow： http: //www.inter-fuser.com/2010/02/android-coverflow-widget-v2.html。
我已经用这个封面创建了一个个人应用程序，但我有一个问题：我想在选择项目（框）时更改背景（如这个链接： http: //www.macgeneration.com/news/voir/187282/乡绅联合国媒体中心优雅的准备）。我已经尝试了一切，但没有成功......可能我需要做一个其他的适配器视图，我不知道。如果你能帮助我将是完美的一天！
对不起我的英语不好 ！
这是我的java代码：
`public class CoverFlowExample extends Activity {
/** Called when the activity is first created. */`
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Use this if you want to use XML layout file
setContentView(R.layout.main);
CoverFlow coverFlow;
coverFlow = (CoverFlow) findViewById(R.id.coverflow);
` coverFlow.setAdapter(new ImageAdapter(this));`
` ImageAdapter coverImageAdapter = new ImageAdapter(this);`
` coverImageAdapter.createReflectedImages();`
` coverFlow.setAdapter(coverImageAdapter);`
` coverFlow.setSpacing(-145);`
` coverFlow.setSelection(0, true);`
` coverFlow.setAnimationDuration(1000);`
}
` public class ImageAdapter extends BaseAdapter {`
` int mGalleryItemBackground;`
` private Context mContext;`
` private FileInputStream fis;`
` private Integer[] mImageIds = {
R.drawable.demolitionman,
R.drawable.diehard1,
R.drawable.diehard2,
R.drawable.diehard3,
R.drawable.diehard4,
R.drawable.district9,
R.drawable.essai,
R.drawable.essai2,
R.drawable.dracula
};`
private ImageView[] mImages;
public ImageAdapter(Context c) {
mContext = c;
mImages = new ImageView[mImageIds.length];
}
` public boolean createReflectedImages() {
//The gap we want between the reflection and the original image
final int reflectionGap = 0;`
int index = 0;
for (int imageId : mImageIds) {
Bitmap originalImage = BitmapFactory.decodeResource(getResources(),
imageId);
int width = originalImage.getWidth();
int height = originalImage.getHeight();
//This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
//Create a Bitmap with the flip matrix applied to it.
//We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height/2, width, height/2, matrix, false);
//Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width
, (height + height/2), Config.ARGB_8888);
//Create a new Canvas with the bitmap that's big enough for
//the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
//Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
//Draw in the gap
Paint deafaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
//Draw in the reflection
canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);
//Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff,
TileMode.CLAMP);
//Set the paint to use this shader (linear gradient)
paint.setShader(shader);
//Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
//Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width,
bitmapWithReflection.getHeight() + reflectionGap, paint);
ImageView imageView = new ImageView(mContext);
imageView.setImageBitmap(bitmapWithReflection);
imageView.setLayoutParams(new CoverFlow.LayoutParams(180, 180));
//imageView.setScaleType(ScaleType.MATRIX);
imageView.setScaleType(ScaleType.FIT_CENTER);
mImages[index++] = imageView;
}
return true;
}
public int getCount() {
return mImageIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
//Use this code if you want to load from resources
ImageView i = new ImageView(mContext);
//i.setImageResource(mImageIds[position]);
i.setImageDrawable( mImages[position].getDrawable() );
i.setLayoutParams(new CoverFlow.LayoutParams(340, 340));
i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
//Make sure we set anti-aliasing otherwise we get jaggies
BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
drawable.setAntiAlias(true);
return i;
//return mImages[position];
}
` /** Returns the size (0.0f to 1.0f) of the views
* depending on the 'offset' to the center. */
public float getScale(boolean focused, int offset) {
/* Formula: 1 / (2 ^ offset) */
return Math.max(0, 1.0f / (float)Math.pow(2, Math.abs(offset)));`
` }`
}
`