我开发一个应用程序，我需要创建相册，并在GridView显示出来。现在我只是显示他们没有任何背景，但我需要一个背景，专辑封面，这样它看起来像一堆照片。背景是这样的：

我尝试了这一点，但不是它的工作：

首先，我创建了一个这样的背景：

 ＆LT;形状的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android＆GT;

    [固体机器人：颜色=＃FFFFFF/＆GT;

    ＆LT;中风
        机器人：宽=1DP
        机器人：颜色=＃000000/＆GT;

    ＆LT;填充
        机器人：底部=1DP
        机器人：左=1DP
        机器人：右=1DP
        机器人：顶部=1DP/＆GT;

＆LT; /形状＆GT;
 

然后，我用一层名单提请堆栈轮换：

 ＆LT;层列表的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android＆GT;

    ＆LT;旋转
        机器人：可绘制=@可绘制/ thumb_bg
        机器人：fromDegrees =90
        机器人：pivotX =50％
        机器人：pivotY =50％
        机器人：toDegrees =100/＆GT;
    ＆LT;旋转
        机器人：可绘制=@可绘制/ thumb_bg
        机器人：fromDegrees =90
        机器人：pivotX =50％
        机器人：pivotY =50％
        机器人：toDegrees =110/＆GT;
    ＆LT;旋转
        机器人：可绘制=@可绘制/ thumb_bg
        机器人：fromDegrees =90
        机器人：pivotX =50％
        机器人：pivotY =50％
        机器人：toDegrees =120/＆GT;

＆LT; /层列表＆gt;
 

解决方案

我用位图创建堆栈视图，并显示在一个ImageView的。您可以在此基础上，保存位图资源然后将其添加在GridView或者用它在GridView的适配器getView我想。

 位图M1C = BitmapFactory.de codeResource（getResources（），R.drawable.cat_13）;
位图M2C = BitmapFactory.de codeResource（getResources（），R.drawable.cat_13）;


INT W = m1c.getWidth（）;
INT H = m1c.getHeight（）;

矩阵MTX =新的Matrix（）;
mtx.postRotate（4）;
位图rotatedBMP = Bitmap.createBitmap（M1C，0，0，W，H，MTX，真）;

矩阵MTX2 =新的Matrix（）;
mtx2.postRotate（-4）;

位图rotatedBMP2 = Bitmap.createBitmap（M1C，0，0，W，H，MTX2，真）;


帆布comboImage =新的Canvas（rotatedBMP）;
comboImage.drawBitmap（rotatedBMP2，-10，-10，空）;
comboImage.drawBitmap（M2C，10，10，NULL）;

ImageView的形象=（ImageView的）findViewById（R.id.imageView1）;
image.setImageBitmap（rotatedBMP）;
 

I am developing an App where i need to create Albums and display them in a GridView. Now i am just displaying them without any background but i need a background for the Album cover so that it looks like a pile of photos. Background something like this:

I tried out this but not it's working:

first i created a single background like this:

<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <solid android:color="#FFFFFF" />

    <stroke
        android:width="1dp"
        android:color="#000000" />

    <padding
        android:bottom="1dp"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp" />

</shape>

And then i used a layer-list to draw the stack with rotation:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <rotate
        android:drawable="@drawable/thumb_bg"
        android:fromDegrees="90"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="100" />
    <rotate
        android:drawable="@drawable/thumb_bg"
        android:fromDegrees="90"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="110" />
    <rotate
        android:drawable="@drawable/thumb_bg"
        android:fromDegrees="90"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="120" />

</layer-list>

I use bitmap to create the stack view and show it in a imageview. You can based on this to save the bitmap is resource then add it in the gridview or use it in gridview adapter in getView I think.

Bitmap m1c = BitmapFactory.decodeResource(getResources(), R.drawable.cat_13);
Bitmap m2c = BitmapFactory.decodeResource(getResources(), R.drawable.cat_13);


int w = m1c.getWidth();
int h = m1c.getHeight();

Matrix mtx = new Matrix();
mtx.postRotate(4);
Bitmap rotatedBMP = Bitmap.createBitmap(m1c, 0, 0, w, h, mtx, true);

Matrix mtx2 = new Matrix();
mtx2.postRotate(-4);

Bitmap rotatedBMP2 = Bitmap.createBitmap(m1c, 0, 0, w, h, mtx2, true);


Canvas comboImage = new Canvas(rotatedBMP);
comboImage.drawBitmap(rotatedBMP2, -10 , -10 , null);
comboImage.drawBitmap(m2c, 10 , 10 , null);

ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageBitmap(rotatedBMP);