Android 带有自定义适配器的Coverflow

我想用自定义适配器创建一个封面流程（图像视图为缩略图，文本视图为标题，进度条指示某些进度…）

CoverFlow小部件的所有示例或实现都基于Gallery（witch仅支持图像集合）

有什么可以帮助我的提示和想法吗

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谢谢：）

您可以使用惰性适配器来实现这一点。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，必须从自定义适配器类的getview方法返回图像视图

以下是示例代码：

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

试一试{ 最终反射率ap=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;

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如果您希望所有视图的coverflow都能从蜂巢中获得，您可以在蜂巢中使用方法View.setRotationY（rotationangle）旋转视图。

我使用的解决方法可能不是您所需要的。不过，这是我能想到的。。。 我将所需内容放入

线性布局

，然后将其转换为

位图

：

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>

---

帮助我将

线性布局

转换为

位图

这相当容易；您使用与listview相同的适配器。扩展

基本适配器

，使用

视图保持架

模式，并在

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

方法。但您应该更改

 transformImageBitmap(THIS child, Transformation t, int rotationAngle) 

到

---

在

CoverFlow.java

中，或者你会得到

ClassCastExceptions

这不是我的观点！！我在android上尝试了许多CoverFlow实现，它们大多是Gallery的实现（不推荐使用…），但几乎所有的都只是显示“图像”。我想创建自定义封面：图像、测试、按钮等。您找到解决方案了吗？我尝试将ImageView更改为LinearLayout，但没有成功，目前我正在尝试自定义ImageView。到目前为止，效果不太好。：（不，我仍然坚持下去，我没有找到解决方案……如果你找到了更好的方法，那么可以通过回答或评论自由分享。）

transformImageBitmap(View child, Transformation t, int rotationAngle)