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 :)
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
。
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。
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
。
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;