【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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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:
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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:
?
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OK大功告成了!!
