Android编程中图片特效处理方法小结

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 { 
  // zoom 
  public 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 bitmap 
  public 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 Bitmap 
  public 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 Bitmap 
  public 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; 
  } 
}

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 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>