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Android中图像特效处理实例教程
来源:互联网   发布日期:2016-01-19 11:08:45   浏览:1090次  

导读:Android中有很多图片特效处理技巧,比如圆角、倒影,今天为大家分享一个实例,教程里共有缩放、圆角、倒影等几种特效。Android中有很多图片特效处理技巧,比如圆角、倒影,今天为大家分享一个实例,本例主要是先 ...

Android中有很多图片特效处理技巧,比如圆角、倒影,今天为大家分享一个实例,教程里共有缩放、圆角、倒影等几种特效。

Android中有很多图片特效处理技巧,比如圆角、倒影,今天为大家分享一个实例,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。

第一步:新建一个Android工程命名为ImageDemo,工程结构如下:

第二步:新建一个.java文件,命名为ImageUtil.java,在里面定义一些图片处理方法,代码如下:

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);

drawable.draw(canvas);

return bitmap;

}

//获得圆角图片的方法

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){

Bitmapoutput = Bitmap.createBitmap(bitmap.getWidth(), bitmap

.getHeight(), Config.ARGB_8888);

Canvas canvas = new Canvas(output);

final intcolor = 0xff424242;

final Paint paint = new Paint();

final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

final RectF rectF = new RectF(rect);

paint.setAntiAlias(true);

canvas.drawARGB(0, 0, 0, 0);

paint.setColor(color);

canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

paint.setXfermode(newPorterDuffXfermode(Mode.SRC_IN));

canvas.drawBitmap(bitmap, rect, rect, paint);

returnoutput;

}

//获得带倒影的图片方法

public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){

final int reflectionGap = 4;

int width = bitmap.getWidth();

int height = bitmap.getHeight();

Matrixmatrix = new Matrix();

matrix.preScale(1, -1);

BitmapreflectionImage = Bitmap.createBitmap(bitmap,

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

BitmapbitmapWithReflection = Bitmap.createBitmap(width, (height + height/2),Config.ARGB_8888);

Canvascanvas = new Canvas(bitmapWithReflection);

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

Paint deafalutPaint = new Paint();

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

deafalutPaint);

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

Paint paint= new Paint();

LinearGradient shader = new LinearGradient(0,

bitmap.getHeight(), 0, bitmapWithReflection.getHeight()

+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);

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);

returnbitmapWithReflection;

}

}

第三步:修改main.xml布局文件,主要放了两个ImageView控件,代码如下:

<?xmlversionxmlversion="1.0" encoding="utf-8"?>

<LinearLayoutxmlns:androidLinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<ImageView

android:id="@+id/image01"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

<ImageView

android:id="@+id/image02"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="10px"

/>

</LinearLayout>

第四步:修改主核心程序,ImageDemo.java,代码如下:

package com.android.tutor;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.widget.ImageView;

public class Imagedemo extends Activity {

private ImageView mImageView01,mImageView02;

public voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

setupViews();

}

private voidsetupViews(){

mImageView01 = (ImageView)findViewById(R.id.image01);

mImageView02 = (ImageView)findViewById(R.id.image02);

//获取壁纸返回值是Drawable

Drawable drawable = getWallpaper();

//将Drawable转化为Bitmap

Bitmap bitmap = ImageUtil.drawableToBitmap(drawable);

//缩放图片

Bitmap zoomBitmap = ImageUtil.zoomBitmap(bitmap, 100, 100);

//获取圆角图片

Bitmap roundBitmap = ImageUtil.getRoundedCornerBitmap(zoomBitmap, 10.0f);

//获取倒影图片

Bitmap reflectBitmap = ImageUtil.createReflectionImageWithOrigin(zoomBitmap);

//这里可以让Bitmap再转化为Drawable

// Drawable roundDrawable = new BitmapDrawable(roundBitmap);

// Drawable reflectDrawable = new BitmapDrawable(reflectBitmap);

// mImageView01.setBackgroundDrawable(roundDrawable);

// mImageView02.setBackgroundDrawable(reflectDrawable);

mImageView01.setImageBitmap(roundBitmap);

mImageView02.setImageBitmap(reflectBitmap);

}

}

第五步:运行上述工程,查看效果如下:

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相关热词: 图像特效

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