（转）Android中几种图像特效处理的集锦！！！

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:

 

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;   

    }   

       

}  

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;

 }

 

}

 

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>

 

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);   

    }   

         

          

}  

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);

    }

      

       

}

第五步:运行上述工程,查看效果如下:



 

OK大功告成了!!

本文参考文献:http://wiki.impjq.net/doku.php?id=code:android-code:image-convert&rev=1275640889&mddo=print