Android编程中图片特效处理方法小结

内容摘要
本文实例总结了Android编程中图片特效处理方法。分享给大家供大家参考，具体如下：
这里介绍的Android图片处理方法包括：
转换 - drawable To bitmap

缩放 - Zoom

圆角 - R
文章正文

本文实例总结了Android编程中图片特效处理方法。分享给大家供大家参考，具体如下：

这里介绍的Android图片处理方法包括：

转换 -  drawable To  bitmap
缩放 -  Zoom
圆角 -  Round Corner
倒影 -  Reflected

bitmapPrcess  code:

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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;
  }
}

Java Code:

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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:

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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/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

希望本文所述对大家Android程序设计有所帮助。
代码注释
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