Android开发ImageUtils工具演示

该工具提供缩放   drawable转换bitmap   转换倒影图     转换成圆角图

package com.nailsoul.imagedemo.utils;    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    * @param bitmap 要放大的图片    * @param dstWidth 目标宽    * @param dstHeight 目标高    * @return    */   public static Bitmap zoomBitmap(Bitmap bitmap, int dstWidth, int dstHeight) {    int width = bitmap.getWidth();    int height = bitmap.getHeight();    Matrix matrix = new Matrix();    float scaleWidht = ((float) dstWidth / width);    float scaleHeight = ((float) dstHeight / height);    matrix.postScale(scaleWidht, scaleHeight);    Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,      matrix, true);    return newbmp;   }     /**    * 将Drawable转化为Bitmap    * @param drawable    * @return    */   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    * @param bitmap     * @param roundPx  4脚幅度    * @return    */   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    * @param bitmap    * @return    */   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.nailsoul.imagedemo;    import java.util.Random;    import android.app.Activity;  import android.graphics.Bitmap;  import android.graphics.drawable.Drawable;  import android.os.Bundle;  import android.view.View;  import android.view.Window;  import android.view.WindowManager;  import android.widget.ImageView;  import android.widget.TextView;    import com.nailsoul.imagedemo.utils.ImageUtil;    public class ImageDemoActivity extends Activity {   private ImageView mIv01, mIv02,mIv03;   private TextView mTv01, mtv02,mtv03,mtv00;     public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    int flag=WindowManager.LayoutParams.FLAG_FULLSCREEN;    getWindow().setFlags(flag,flag);    getWindow().requestFeature(Window.FEATURE_NO_TITLE);    setContentView(R.layout.main);    setupViews();   }     private void setupViews() {    mIv01 = findView(R.id.image01);    mIv02 = findView(R.id.image02);    mIv03 = findView(R.id.image03);    mtv00=findView(R.id.text00);    mTv01=findView(R.id.text01);    mtv02=findView(R.id.text02);    mtv03=findView(R.id.text03);      // 获取壁纸返回值是Drawable  //  Drawable drawable = getWallpaper();    Drawable drawable=getResources().getDrawable(R.drawable.a1+new Random().nextInt(15));    // 将Drawable转化为Bitmap    Bitmap bitmap = ImageUtil.drawableToBitmap(drawable);    // 缩放图片    Bitmap zoomBitmap = ImageUtil.zoomBitmap(bitmap, 355, 317);    // 获取圆角图片    Bitmap roundBitmap = ImageUtil      .getRoundedCornerBitmap(bitmap, 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);      mIv01.setImageBitmap(roundBitmap);    mIv02.setImageBitmap(reflectBitmap);    mIv03.setImageBitmap(zoomBitmap);    mtv00.setText("ImageUtils演示");    mTv01.setText("上图为圆角图   width:"+roundBitmap.getWidth()+"height:"+roundBitmap.getHeight());    mtv02.setText("上图为倒影图   width:"+reflectBitmap.getWidth()+"height:"+reflectBitmap.getHeight());    mtv03.setText("上图为缩放图   width:"+zoomBitmap.getWidth()+"height:"+zoomBitmap.getHeight());   }           public <T> T findView(int id){    return (T) super.findViewById(id);   }  }

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      android:orientation="vertical" >        <ScrollView          android:layout_width="fill_parent"          android:layout_height="fill_parent"          android:scrollbars="vertical" >            <LinearLayout              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:orientation="vertical" >                <TextView                  android:id="@+id/text00"                  android:layout_width="fill_parent"                  android:layout_height="wrap_content"                  android:gravity="center" />                <ImageView                  android:id="@+id/image01"                  android:layout_width="wrap_content"                  android:layout_height="wrap_content"                  android:padding="10px" />                <TextView                  android:id="@+id/text01"                  android:layout_width="fill_parent"                  android:layout_height="wrap_content"                  android:gravity="center" />                <ImageView                  android:id="@+id/image02"                  android:layout_width="wrap_content"                  android:layout_height="wrap_content"                  android:padding="10px" />                <TextView                  android:id="@+id/text02"                  android:layout_width="fill_parent"                  android:layout_height="wrap_content"                  android:gravity="center" />                <ImageView                  android:id="@+id/image03"                  android:layout_width="wrap_content"                  android:layout_height="wrap_content"                  android:padding="10px" />                <TextView                  android:id="@+id/text03"                  android:layout_width="fill_parent"                  android:layout_height="wrap_content"                  android:gravity="center" />          </LinearLayout>      </ScrollView>    </LinearLayout>