android - 带有自定义适配器的 Coverflow

Question

我想使用自定义适配器创建一个封面流（图像视图作为缩略图，文本视图作为标题，进度条表示一些进度..）。

Cover 流小部件的所有示例或实现均基于 Gallery（witch 仅支持图像集合）。

有什么提示和想法可以帮助我吗？

谢谢 ：）

Answer 1

这很容易做到；您使用与例如列表视图相同的适配器。扩展 BaseAdapter, 使用ViewHolder模式并在

public View getView(int position, View convertView, ViewGroup parent) {

方法。但是你应该改变

 transformImageBitmap(THIS child, Transformation t, int rotationAngle) 

至

transformImageBitmap(View child, Transformation t, int rotationAngle)

CoverFlow.java或者你会得到ClassCastExceptions。

Answer 2

如果您想要所有视图的覆盖流，而不是来自蜂窝的可能，您可以使用方法 View.setRotationY(rotationangle) 旋转视图。

Answer 3

我使用的解决方法可能不是您需要的。然而，这是我能想到的......我把我想要的任何东西放在 aLinearLayout中，然后将其转换为 a Bitmap：

LayoutInflater inflater = (LayoutInflater) ClassifiedActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);              

LinearLayout layout = (LinearLayout) inflater.inflate(R.layout.my_layout_as_imageview,
                null);
layout.setBackgroundResource(R.drawable.stub);

layout.setDrawingCacheEnabled(true);

layout.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 
            MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
layout.layout(0, 0, layout.getMeasuredWidth(), layout.getMeasuredHeight());

layout.buildDrawingCache(true);
Bitmap b = Bitmap.createBitmap(layout.getDrawingCache());
layout.setDrawingCacheEnabled(false); // clear drawing cache

ImageView iv= (ImageView) findViewById(R.id.imageView1);
iv.setImageBitmap(b);

我的布局 XML 如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Medium Text" />

</LinearLayout>

这个答案帮助我将 a 转换LinearLayout为 a Bitmap。

Answer 4

您可以通过使用惰性适配器来做到这一点。您必须在图像加载器类的解码文件中创建反射图像。接下来，您必须从自定义适配器类的 getview 方法返回一个图像视图。

这是示例代码：

In main activity:

CoverFlow coverflow=(CoverFlow)findViewById(R.id.yourcoverflowid);

coverflow.setAdapter(new customadapter(getActivity(),list,imagesize));

In getview method of custom adapter:

    ImageView i=new ImageView(activity);       
    imageLoader.DisplayImage(data.get(position).getimage(),i);


    i.setPadding(0,5,0,0);

    i.setLayoutParams(new CoverFlow.LayoutParams(width,height));

    i.setScaleType(ImageView.ScaleType.MATRIX);

    return i;

In decodefile method of imageloader class

尝试{最终 int 反射间隙 = 4;

    Bitmap originalImage;


     BitmapFactory.Options o = new BitmapFactory.Options();
     o.inJustDecodeBounds = true;
     FileInputStream stream1=new FileInputStream(f);
     originalImage=BitmapFactory.decodeStream(stream1);
     stream1.close();

        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); 


    return bitmapWithReflection;