Android 实现图片的圆角，倒影，转换

核心提示：大家好,这一节给大家分享的是Android中几种图像特效处理的小技巧,比如圆角,倒影,还有就是图片缩放,Drawable转化为Bitmap,Bitmap转化为Drawable等等.本例主要是先获取壁纸(getWallpaper()),然后对当前壁纸的一些特效处理.ImageUtil.javaJava代码package

大家好,这一节给大家分享的是Android中几种图像特效处理的小技巧,比如圆角,倒影,还有就是图片缩放,Drawable转化为Bitmap,Bitmap转化为Drawable等等.

本例主要是先获取壁纸(getWallpaper()),然后对当前壁纸的一些特效处理.

ImageUtil.java

Java代码

package com.android.tutor;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.LinearGradient;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.graphics.PixelFormat;

import android.graphics.PorterDuffXfermode;

import android.graphics.Rect;

import android.graphics.RectF;

import android.graphics.Bitmap.Config;

import android.graphics.PorterDuff.Mode;

import android.graphics.Shader.TileMode;

import android.graphics.drawable.Drawable;

public class ImageUtil {

//放大缩小图片

public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){

int width = bitmap.getWidth();

int height = bitmap.getHeight();

Matrix matrix = new Matrix();

float scaleWidht = ((float)w / width);

float scaleHeight = ((float)h / height);

matrix.postScale(scaleWidht, scaleHeight);

Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);

return newbmp;

}

//将Drawable转化为Bitmap

public static Bitmap drawableToBitmap(Drawable drawable){

int width = drawable.getIntrinsicWidth();

int height = drawable.getIntrinsicHeight();

Bitmap bitmap = Bitmap.createBitmap(width, height,

drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

: Bitmap.Config.RGB_565);

Canvas canvas = new Canvas(bitmap);

drawable.setBounds(0,0,width,height);