我正在使用这个CoverFlow：http://www.inter-fuser.com/2010/02/android-coverflow-widget-v2.html。
我创建了一个带有此封面流的个人应用程序，但我遇到了问题：我想在选择项目（框）时更改背景（如此链接：http://www.macgeneration.com/news/voir/187282/squire-un-media-center-elegant-en-preparation）。我尝试了一切但没有成功......可能我需要做其他适配器视图，我不知道。如果你能帮助我将是一个完美的一天！
抱歉我的英文！
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)));`
` }`
}
`
答案 0 :(得分：1)
它对你没问题。
您可以在getview方法中实现此目的。您将使用 setOnItemSelectedListener 获得选择位置。
如下所示是您必须在Coverflow中设置的监听器。
coverFlow.setOnItemSelectedListener(new SelectListener(this));
int sel_pos;
public class ImageAdapter extends BaseAdapter
{
private Context mContext;
private Integer[] UnselectedImage = {
R.drawable.a,
R.drawable.b,
R.drawable.c,
R.drawable.d,
R.drawable.e,
R.drawable.f
};
private Integer[] selectedImage =
{
R.drawable.a_sel,
R.drawable.b_sel,
R.drawable.c_sel,
R.drawable.d_sel,
R.drawable.e_sel,
R.drawable.f_sel,
};
public ImageAdapter(Context c)
{
mContext = c;
}
public int getCount() {
return selectedImage.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@SuppressWarnings("deprecation")
public View getView(int position, View convertView, ViewGroup parent)
{
final ImageView i = new ImageView(mContext);
i.refreshDrawableState();
i.setDrawingCacheEnabled(false);
i.setAdjustViewBounds(true);
Log.e("position==", ""+position);
if(sel_pos==position)
{
i.setImageResource(selectedImage[position]);
}
else
{
i.setImageResource(UnselectedImage[position]);
}
i.setLayoutParams(new CoverFlow.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
drawable.setAntiAlias(true);
return i;
}
private class SelectListener implements AdapterView.OnItemSelectedListener
{
public SelectListener(Context c)
{
}
@SuppressWarnings("deprecation")
public void onItemSelected(AdapterView<?> parent, View v, int position,long id)
{
Log.e("Changed----->", "" + position);
// Zoom the new selected view
try
{
sel_pos = position;
coverImageAdapter.notifyDataSetChanged();
} catch (Exception animate)
{
}
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
享受代码。