Android --- 图片处理的方法

转换 - drawable To bitmap

缩放 - Zoom

圆角 - Round Corner

倒影 - Reflected

bitmapPrcess code:

package com.learn.games;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 bitmapProcess {// zoompublic static Bitmap zoomBitmap(Bitmap bitmap, int w, int h){int width = bitmap.getWidth();int height = bitmap.getHeight();Matrix matrix = new Matrix();float scaleWidth = w/(float)width;float scaleHeight = h/(float)height;matrix.postScale(scaleWidth, scaleHeight);Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);return bitmap2;}// drawable to bitmappublic static Bitmap drawable2Bitmap(Drawable drawable){int width = drawable.getIntrinsicHeight();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;}// Round Corner Bitmappublic static Bitmap getRoundCornerBitmap(Bitmap bitmap, float roundPX){int width = bitmap.getWidth();int height = bitmap.getHeight();Bitmap bitmap2 = Bitmap.createBitmap(width, height, Config.ARGB_8888);Canvas canvas = new Canvas(bitmap2);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, width, height);final RectF rectF = new RectF(rect);paint.setColor(color);paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);canvas.drawRoundRect(rectF, roundPX, roundPX, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return bitmap2;}// Reflect Bitmappublic static Bitmap createReflectedBitmap(Bitmap bitmap){final int reflectedGap = 4;int width = bitmap.getWidth();int height = bitmap.getHeight();Matrix matrix = new Matrix();matrix.preScale(1, -1);Bitmap reflectedImage = Bitmap.createBitmap(bitmap, 0, height/2, width, height/2, matrix, false);Bitmap reflectedBitmap = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);Canvas canvas = new Canvas(reflectedBitmap);canvas.drawBitmap(bitmap, 0, 0, null);Paint defaultPaint = new Paint();canvas.drawRect(0, height, width, height + reflectedGap, defaultPaint);canvas.drawBitmap(reflectedImage, 0, height + reflectedGap, null);Paint paint = new Paint();LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,reflectedBitmap.getHeight() + reflectedGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);paint.setShader(shader);paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));canvas.drawRect(0, height, width, reflectedBitmap.getHeight() + reflectedGap, paint);return reflectedBitmap;}}

Java Code:

package com.learn.games;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.widget.ImageView;public class MyBitmapProcessActivity extends Activity {private ImageView imgView1;private ImageView imgView2;private ImageView imgView3;private ImageView imgView4; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); drawBitmap(); } private void drawBitmap(){ imgView1 = (ImageView)findViewById(R.id.imgView1); imgView2 = (ImageView)findViewById(R.id.imgView2); imgView3 = (ImageView)findViewById(R.id.imgView3); imgView4 = (ImageView)findViewById(R.id.imgView4); Drawable drawable = this.getWallpaper(); Bitmap bitmap = bitmapProcess.drawable2Bitmap(drawable);// drawable to bitmap Bitmap zoomBitmap = bitmapProcess.zoomBitmap(bitmap, 100, 100);// zoom Bitmap roundBitmap = bitmapProcess.getRoundCornerBitmap(zoomBitmap, 10.0f);// round corner Bitmap reflectedBitmap = bitmapProcess.createReflectedBitmap(zoomBitmap);// reflect bitmap // drawable to bitmap imgView1.setImageBitmap(bitmap); imgView2.setImageBitmap(zoomBitmap); imgView3.setImageBitmap(roundBitmap); imgView4.setImageBitmap(reflectedBitmap); // bitmap to drawable Drawable roundDrawable = new BitmapDrawable(roundBitmap); Drawable reflectedDrawable = new BitmapDrawable(reflectedBitmap); imgView1.setBackgroundDrawable(roundDrawable); imgView2.setBackgroundDrawable(reflectedDrawable); }}

XML:

<?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/imgView1" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <ImageView android:id="@+id/imgView2" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <ImageView android:id="@+id/imgView3" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <ImageView android:id="@+id/imgView4" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>
效果图：

drawable2bitmap

zoom

round corner

reflected bitmap

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