Android实现CoverFlow效果三
ImageAdapter适配器：
001 package com.coverflow;
package com.coverflow;
002
003 import android.content.Context;
004 import android.graphics.Bitmap;
005 import android.graphics.BitmapFactory;
006 import android.graphics.Canvas;
007 import android.graphics.LinearGradient;
008 import android.graphics.Matrix;
009 import android.graphics.Paint;
010 import android.graphics.PorterDuffXfermode;
011 import android.graphics.Bitmap.Config;
012 import android.graphics.PorterDuff.Mode;
013 import android.graphics.Shader.TileMode;
014 import android.graphics.drawable.BitmapDrawable;
015 import android.view.View;
016 import android.view.ViewGroup;
017 import android.widget.BaseAdapter;
018 import android.widget.ImageView;
019
020 import com.gallery.R;
021
022 public class ImageAdapter extends BaseAdapter {
023 int mGalleryItemBackground;
024 private Context mContext;
025 private Integer[] mImageIds = {
026 R.drawable.a1,
027 R.drawable.a2,
028 R.drawable.a3,
029 R.drawable.a4,
030 R.drawable.a5 };
031
032 public ImageAdapter(Context c) {
033 mContext = c;
034 }
035
036 public int getCount() {
037 return mImageIds.length;
038 }
039
040 public Object getItem(int position) {
041 return position;
042 }
043
044 public long getItemId(int position) {
045 return position;
046 }
047
048 public View getView(int position, View convertView, ViewGroup parent) {
049
050 ImageView i = createReflectedImages(mContext,mImageIds[position]);
051
052 i.setLayoutParams(new CoverFlow.LayoutParams(120, 100));
053 i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
054
055 // 设置的抗锯齿
056 BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
057 drawable.setAntiAlias(true);
058 return i;
059 }
060
061 public float getScale(boolean focused, int offset) {
062 return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
063 }
064
065 public ImageView createReflectedImages(Context mContext,int imageId) {
066
067 Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);
068
069 final int reflectionGap = 4;
070
071 int width = originalImage.getWidth();
072 int height = originalImage.getHeight();
073
074 Matrix matrix = new Matrix();
075 matrix.preScale(1, -1);
076
077 Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
078 height / 2, width, height / 2, matrix, false);
079
080 Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
081 (height + height / 2), Config.ARGB_8888);
082
083 Canvas canvas = new Canvas(bitmapWithReflection);
084
085 canvas.drawBitmap(originalImage, 0, 0, null);
086
087 Paint deafaultPaint = new Paint();
088 canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
089
090 canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
091
092 Paint paint = new Paint();
093 LinearGradient shader = new LinearGradient(0, originalImage
094 .getHeight(), 0, bitmapWithReflection.getHeight()
095 + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.MIRROR);
096
097 paint.setShader(shader);
098
099 paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
100
101 canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
102 + reflectionGap, paint);
103
104 ImageView imageView = new ImageView(mContext);
105 imageView.setImageBitmap(bitmapWithReflection);
106
107 return imageView;
108 }
109
110 }
002
003 import android.content.Context;
004 import android.graphics.Bitmap;
005 import android.graphics.BitmapFactory;
006 import android.graphics.Canvas;
007 import android.graphics.LinearGradient;
008 import android.graphics.Matrix;
009 import android.graphics.Paint;
010 import android.graphics.PorterDuffXfermode;
011 import android.graphics.Bitmap.Config;
012 import android.graphics.PorterDuff.Mode;
013 import android.graphics.Shader.TileMode;
014 import android.graphics.drawable.BitmapDrawable;
015 import android.view.View;
016 import android.view.ViewGroup;
017 import android.widget.BaseAdapter;
018 import android.widget.ImageView;
019
020 import com.gallery.R;
021
022 public class ImageAdapter extends BaseAdapter {
023 int mGalleryItemBackground;
024 private Context mContext;
025 private Integer[] mImageIds = {
026 R.drawable.a1,
027 R.drawable.a2,
028 R.drawable.a3,
029 R.drawable.a4,
030 R.drawable.a5 };
031
032 public ImageAdapter(Context c) {
033 mContext = c;
034 }
035
036 public int getCount() {
037 return mImageIds.length;
038 }
039
040 public Object getItem(int position) {
041 return position;
042 }
043
044 public long getItemId(int position) {
045 return position;
046 }
047
048 public View getView(int position, View convertView, ViewGroup parent) {
049
050 ImageView i = createReflectedImages(mContext,mImageIds[position]);
051
052 i.setLayoutParams(new CoverFlow.LayoutParams(120, 100));
053 i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
054
055 // 设置的抗锯齿
056 BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
057 drawable.setAntiAlias(true);
058 return i;
059 }
060
061 public float getScale(boolean focused, int offset) {
062 return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
063 }
064
065 public ImageView createReflectedImages(Context mContext,int imageId) {
066
067 Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);
068
069 final int reflectionGap = 4;
070
071 int width = originalImage.getWidth();
072 int height = originalImage.getHeight();
073
074 Matrix matrix = new Matrix();
075 matrix.preScale(1, -1);
076
077 Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
078 height / 2, width, height / 2, matrix, false);
079
080 Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
081 (height + height / 2), Config.ARGB_8888);
082
083 Canvas canvas = new Canvas(bitmapWithReflection);
084
085 canvas.drawBitmap(originalImage, 0, 0, null);
086
087 Paint deafaultPaint = new Paint();
088 canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
089
090 canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
091
092 Paint paint = new Paint();
093 LinearGradient shader = new LinearGradient(0, originalImage
094 .getHeight(), 0, bitmapWithReflection.getHeight()
095 + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.MIRROR);
096
097 paint.setShader(shader);
098
099 paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
100
101 canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
102 + reflectionGap, paint);
103
104 ImageView imageView = new ImageView(mContext);
105 imageView.setImageBitmap(bitmapWithReflection);
106
107 return imageView;
108 }
109
110 }
BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
drawable.setAntiAlias(true);
是保证图片绕Y旋转了以后不会出现锯齿.
下面是Activity：
01 package com.coverflow;
package com.coverflow;
02
03 import android.app.Activity;
04 import android.graphics.Color;
05 import android.os.Bundle;
06
07 import com.gallery.R;
08
09 public class HelloAndroid extends Activity {
10 /** Called when the activity is first created. */
11 @Override
12 public void onCreate(Bundle savedInstanceState) {
13 super.onCreate(savedInstanceState);
14
15 CoverFlow cf = new CoverFlow(this);
16 // cf.setBackgroundResource(R.drawable.shape);
17 cf.setBackgroundColor(Color.BLACK);
18 cf.setAdapter(new ImageAdapter(this));
19 ImageAdapter imageAdapter = new ImageAdapter(this);
20 cf.setAdapter(imageAdapter);
21 // cf.setAlphaMode(false);
22 // cf.setCircleMode(false);
23 cf.setSelection(2, true);
24 cf.setAnimationDuration(1000);
25 setContentView(cf);
26 }
27
28 }
02
03 import android.app.Activity;
04 import android.graphics.Color;
05 import android.os.Bundle;
06
07 import com.gallery.R;
08
09 public class HelloAndroid extends Activity {
10 /** Called when the activity is first created. */
11 @Override
12 public void onCreate(Bundle savedInstanceState) {
13 super.onCreate(savedInstanceState);
14
15 CoverFlow cf = new CoverFlow(this);
16 // cf.setBackgroundResource(R.drawable.shape);
17 cf.setBackgroundColor(Color.BLACK);
18 cf.setAdapter(new ImageAdapter(this));
19 ImageAdapter imageAdapter = new ImageAdapter(this);
20 cf.setAdapter(imageAdapter);
21 // cf.setAlphaMode(false);
22 // cf.setCircleMode(false);
23 cf.setSelection(2, true);
24 cf.setAnimationDuration(1000);
25 setContentView(cf);
26 }
27
28 }
参考自：
http://www.eoeandroid.com/thread-70209-1-1.html
http://www.apkbus.com/android-18441-1-1.html