android图片左右滚动类似翻页切换幻灯片效果

1表示去掉线的锯齿，2表示去掉图片的锯齿。按位与后3就表示都去掉

如果是viewgroup 也在dispatchdraw加上上面那段代码

4当在drawable和其子类时，也可以用到setFilterBitmap方法

至此，对抗锯齿 应该较熟悉了。

现在，对自己这段时间学习的东西小结一下：先看一下效果图：

1. ActivityMain.java

package com.gallery;

import android.app.Activity;

import android.os.Bundle;

publicclass ActivityMain extends Activity {

publicvoid onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.layout_gallery);

Integer[] images = { R.drawable.img0001, R.drawable.img0030,

R.drawable.img0100, R.drawable.img0130, R.drawable.img0200,

R.drawable.img0230, R.drawable.img0300, R.drawable.img0330,

R.drawable.img0354 };  //定义图片数组

ImageAdapter adapter = new ImageAdapter(this, images);

adapter.createReflectedImages();

GalleryFlow galleryFlow = (GalleryFlow) findViewById(R.id.Gallery01);

galleryFlow.setAdapter(adapter);   

}

}

2 GalleryFlow.java

package com.gallery;

import android.content.Context;

import android.graphics.Camera;

import android.graphics.Matrix;

import android.util.AttributeSet;

import android.view.View;

import android.view.animation.Transformation;

import android.widget.Gallery;

import android.widget.ImageView;

publicclass GalleryFlow extends Gallery {

private Camera mCamera = new Camera();

privateintmMaxRotationAngle = 60;

privateintmMaxZoom = -120;

privateintmCoveflowCenter;

public GalleryFlow(Context context) {

super(context);

this.setStaticTransformationsEnabled(true);

}

public GalleryFlow(Context context, AttributeSet attrs) {

super(context, attrs);

this.setStaticTransformationsEnabled(true);

}

public GalleryFlow(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

this.setStaticTransformationsEnabled(true);

}

publicint getMaxRotationAngle() {

returnmMaxRotationAngle;

}

publicvoid setMaxRotationAngle(int maxRotationAngle) {

mMaxRotationAngle = maxRotationAngle;

}

publicint getMaxZoom() {

returnmMaxZoom;

}

publicvoid setMaxZoom(int maxZoom) {

mMaxZoom = maxZoom;

}

privateint getCenterOfCoverflow() {

return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2

+ getPaddingLeft();

}

privatestaticint getCenterOfView(View view) {

return view.getLeft() + view.getWidth() / 2;

}

protectedboolean getChildStaticTransformation(View child, Transformation t) {

finalint childCenter = getCenterOfView(child);

finalint childWidth = child.getWidth();

    int rotationAngle = 0;

t.clear();

t.setTransformationType(Transformation.TYPE_MATRIX);

if (childCenter == mCoveflowCenter) {

transformImageBitmap((ImageView) child, t, 0);

} else {

                 rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);

if (Math.abs(rotationAngle) > mMaxRotationAngle) {

rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle

: mMaxRotationAngle;

}

transformImageBitmap((ImageView) child, t, rotationAngle);

}

returntrue;

}

protectedvoid onSizeChanged(int w, int h, int oldw, int oldh) {

mCoveflowCenter = getCenterOfCoverflow();

super.onSizeChanged(w, h, oldw, oldh);

}

privatevoid transformImageBitmap(ImageView child, Transformation t,

int rotationAngle) {

mCamera.save();

final Matrix imageMatrix = t.getMatrix();

finalint imageHeight = child.getLayoutParams().height;

finalint imageWidth = child.getLayoutParams().width;

finalint rotation = Math.abs(rotationAngle);

// 在Z轴上正向移动

// 在Y轴上移动，上下移动；X轴上左右移动。

mCamera.translate(0.0f, 0.0f, 100.0f);

if (rotation < mMaxRotationAngle) {

float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));

mCamera.translate(0.0f, 0.0f, zoomAmount);

}

// 在Y轴上旋转，竖向向里翻转。

// 在X轴上旋转，则横向向里翻转。

mCamera.rotateY(rotationAngle);

mCamera.getMatrix(imageMatrix);

imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));

imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));

mCamera.restore();

}

}

3. ImageAdapter.java

package com.gallery;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.LinearGradient;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.graphics.PorterDuffXfermode;

import android.graphics.Bitmap.Config;

import android.graphics.PorterDuff.Mode;

import android.graphics.Shader.TileMode;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

publicclass ImageAdapter extends BaseAdapter {

intmGalleryItemBackground;

private Context mContext;

private Integer[] mImageIds;

private ImageView[] mImages;

public ImageAdapter(Context c, Integer[] ImageIds) {

mContext = c;

mImageIds = ImageIds;

mImages = new ImageView[mImageIds.length];

}

publicboolean createReflectedImages() {

finalint reflectionGap = 4;

int index = 0;

for (int imageId : mImageIds) {

Bitmap originalImage = BitmapFactory.decodeResource(mContext

.getResources(), imageId);

int width = originalImage.getWidth();

int height = originalImage.getHeight();

Matrix matrix = new Matrix();

matrix.preScale(1, -1);

Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,

height / 2, width, height / 2, matrix, false);

Bitmap bitmapWithReflection = Bitmap.createBitmap(width,

(height + height / 2), Config.ARGB_8888);

Canvas canvas = new Canvas(bitmapWithReflection);

canvas.drawBitmap(originalImage, 0, 0, null);

Paint deafaultPaint = new Paint();

canvas.drawRect(0, height, width, height + reflectionGap,

deafaultPaint);

canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

Paint paint = new Paint();

LinearGradient shader = new LinearGradient(0,

originalImage.getHeight(), 0,

bitmapWithReflection.getHeight() + reflectionGap,

0x70ffffff, 0x00ffffff, TileMode.CLAMP);

paint.setShader(shader);

paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()

+ reflectionGap, paint);

ImageView imageView = new ImageView(mContext);

imageView.setImageBitmap(bitmapWithReflection);

imageView.setLayoutParams(new GalleryFlow.LayoutParams(180, 240));

mImages[index++] = imageView;

}

returntrue;

}

publicint getCount() {

returnmImageIds.length;

}

public Object getItem(int position) {

return position;

}

publiclong getItemId(int position) {

return position;

}

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

returnmImages[position];

}

publicfloat getScale(boolean focused, int offset) {

return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));

}

}

另外：

layout_gallery.xml布局

<?xml version="1.0" encoding="utf-8"?>

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

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="#ffffff"

    >

<com.gallery.GalleryFlow

    android:id="@+id/Gallery01"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content" android:layout_centerInParent="true"/>

</RelativeLayout>

(本篇完)

转载请保留链接：http://www.hongshengpeng.com/article/show/84.aspx