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发表于 2012-3-23 11:50:04
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加入了倒影效果的Bitmap的函数。代码如下
package com.util;
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import android.graphics.Bitmap;
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import android.graphics.Bitmap.Config;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.LinearGradient;
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import android.graphics.Matrix;
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import android.graphics.Paint;
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import android.graphics.PorterDuff.Mode;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.Shader.TileMode;
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public class BitmapUtil {
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public static Bitmap createTxtImage(String txt, int txtSize) {
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Bitmap mbmpTest = Bitmap.createBitmap(txt.length() * txtSize + 4,
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txtSize + 4, Config.ARGB_8888);
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Canvas canvasTemp = new Canvas(mbmpTest);
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Paint p = new Paint();
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p.setAntiAlias(true);
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p.setColor(Color.WHITE);
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p.setTextSize(txtSize);
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canvasTemp.drawText(txt, 2, txtSize - 2, p);
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return mbmpTest;
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}
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public static Bitmap createReflectedImage(Bitmap originalImage) {
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// The gap we want between the reflection and the original image
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final int reflectionGap = 0;
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int width = originalImage.getWidth();
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int height = originalImage.getHeight();
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// This will not scale but will flip on the Y axis
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Matrix matrix = new Matrix();
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matrix.preScale(1, -1);
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// Create a Bitmap with the flip matrix applied to it.
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// We only want the bottom half of the image
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Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
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height / 2, width, height / 2, matrix, false);
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// Create a new bitmap with same width but taller to fit reflection
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Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
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(height + height / 2), Config.ARGB_8888);
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// Create a new Canvas with the bitmap that's big enough for
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// the image plus gap plus reflection
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Canvas canvas = new Canvas(bitmapWithReflection);
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// Draw in the original image
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canvas.drawBitmap(originalImage, 0, 0, null);
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// Draw in the gap
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Paint defaultPaint = new Paint();
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canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);
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// Draw in the reflection
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canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
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// Create a shader that is a linear gradient that covers the reflection
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Paint paint = new Paint();
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LinearGradient shader = new LinearGradient(0,
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originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
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+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
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// Set the paint to use this shader (linear gradient)
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paint.setShader(shader);
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// Set the Transfer mode to be porter duff and destination in
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paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
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// Draw a rectangle using the paint with our linear gradient
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canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
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+ reflectionGap, paint);
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return bitmapWithReflection;
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}
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}
复制代码
最后就是主界面代码中对Gallery的调用了，关键代码如下
private CustomGallery gallery;
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private UniversityAdapter pAdapter;
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private ArrayList<University> universityList = new ArrayList<University>();
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private void init(){
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pAdapter = new UniversityAdapter(MainActivity.this, universityList);//初始化我们自定义的Adapter
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University p = new University();
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p.setName("电子科技大学");
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universityList .add(p);
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University p1 = new University();
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p1.setName("清华大学");
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universityList .add(p1);
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University p2 = new University();
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p2.setName("北京大学");
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universityList .add(p2);
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gallery.setAdapter(pAdapter);//设置Gallery显示的内容
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gallery.setSelection(Integer.MAX_VALUE / 2);//通过setSelection() 可以设置当前选中的元素，这里我们将
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其设置在中间
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gallery.setOnItemSelectedListener(this);//这里对Item项进行监听，以实现刷新显示的效果
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}
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@Override
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public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
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long arg3) {
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// TODO Auto-generated method stub
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pAdapter.notifyDataSetChanged(arg2);//arg2会返回当前选中项的位置，调用此方法，通知更新
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}
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@Override
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public void onNothingSelected(AdapterView<?> arg0) {
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// TODO Auto-generated method stub
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} |
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发表于 2012-3-23 11:49:33
