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转:Android中几种图像奇效处理方法小结

2012-06-30 
转:Android中几种图像特效处理方法小结原文地址:http://www.androidmi.com/Androidkaifa/jinjie/201011/17

转:Android中几种图像特效处理方法小结

原文地址:http://www.androidmi.com/Androidkaifa/jinjie/201011/1788.html

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QQ:524509159?
Email:hoohbood@gmail.com?
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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.

废话少说了,直接讲解今天的实例,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.大家按步骤一步一步来:

第一步:新建一个Android工程命名为ImageDemo,工程结构如下:


转:Android中几种图像奇效处理方法小结

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:

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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){                      Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap                   .getHeight(), Config.ARGB_8888);           Canvas canvas = new Canvas(output);               final int color = 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(new PorterDuffXfermode(Mode.SRC_IN));           canvas.drawBitmap(bitmap, rect, rect, paint);               return output;       }       //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();                      Matrix matrix = new Matrix();           matrix.preScale(1, -1);                      Bitmap reflectionImage = Bitmap.createBitmap(bitmap,                    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(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);               return bitmapWithReflection;       }          } 

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

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

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第四步:修改主核心程序,ImageDemo.java,代码如下:

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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 void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.main);           setupViews();       }             private void setupViews(){           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);       }   }  

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第五步:运行上述工程,查看效果如下:


转:Android中几种图像奇效处理方法小结

OK大功告成了!!

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