实现图片的圆角，倒影，转换

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

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;      }        }

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

<?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>

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 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);      }                   }

运行上述工程,查看效果如下:

转载自：http://blog.csdn.net/Android_Tutor/archive/2010/11/02/5981753.aspx

在此谢谢原作者的分享。

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