Android开发ImageUtils工具演示
jopen
10年前
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>