非常实用的Android图片工具类

import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.CompressFormat;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.ColorMatrix;import android.graphics.ColorMatrixColorFilter;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Shader;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;/** * 图片工具类 * @author wwj * 2013/7/3 */public class ImageUtil {  /**图片的八个位置**/  public static final int TOP = 0;      //上    public static final int BOTTOM = 1;      //下  public static final int LEFT = 2;      //左  public static final int RIGHT = 3;      //右  public static final int LEFT_TOP = 4;    //左上  public static final int LEFT_BOTTOM = 5;  //左下  public static final int RIGHT_TOP = 6;    //右上  public static final int RIGHT_BOTTOM = 7;  //右下    /**   * 图像的放大缩小方法   * @param src    源位图对象   * @param scaleX  宽度比例系数   * @param scaleY  高度比例系数   * @return 返回位图对象   */  public static Bitmap zoomBitmap(Bitmap src, float scaleX, float scaleY) {    Matrix matrix = new Matrix();    matrix.setScale(scaleX, scaleY);    Bitmap t_bitmap = Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true);    return t_bitmap;  }    /**   * 图像放大缩小--根据宽度和高度   * @param src   * @param width   * @param height   * @return   */  public static Bitmap zoomBimtap(Bitmap src, int width, int height) {    return Bitmap.createScaledBitmap(src, width, height, true);  }    /**   * 将Drawable转为Bitmap对象   * @param drawable   * @return   */  public static Bitmap drawableToBitmap(Drawable drawable) {    return ((BitmapDrawable)drawable).getBitmap();  }      /**   * 将Bitmap转换为Drawable对象   * @param bitmap   * @return   */  public static Drawable bitmapToDrawable(Bitmap bitmap) {    Drawable drawable = new BitmapDrawable(bitmap);    return drawable;  }    /**   * Bitmap转byte[]   * @param bitmap   * @return   */  public static byte[] bitmapToByte(Bitmap bitmap) {    ByteArrayOutputStream out = new ByteArrayOutputStream();    bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);    return out.toByteArray();  }    /**   * byte[]转Bitmap   * @param data   * @return   */  public static Bitmap byteToBitmap(byte[] data) {    if(data.length != 0) {      return BitmapFactory.decodeByteArray(data, 0, data.length);    }    return null;  }    /**   * 绘制带圆角的图像   * @param src   * @param radius   * @return   */  public static Bitmap createRoundedCornerBitmap(Bitmap src, int radius) {    final int w = src.getWidth();    final int h = src.getHeight();    // 高清量32位图    Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);    Paint paint = new Paint();    Canvas canvas = new Canvas(bitmap);    canvas.drawARGB(0, 0, 0, 0);    paint.setColor(0xff424242);    // 防止边缘的锯齿    paint.setFilterBitmap(true);    Rect rect = new Rect(0, 0, w, h);    RectF rectf = new RectF(rect);    // 绘制带圆角的矩形    canvas.drawRoundRect(rectf, radius, radius, paint);        // 取两层绘制交集，显示上层    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));    // 绘制图像    canvas.drawBitmap(src, rect, rect, paint);    return bitmap;  }    /**   * 创建选中带提示图片   * @param context   * @param srcId   * @param tipId   * @return   */  public static Drawable createSelectedTip(Context context, int srcId, int tipId) {    Bitmap src = BitmapFactory.decodeResource(context.getResources(), srcId);    Bitmap tip = BitmapFactory.decodeResource(context.getResources(), tipId);    final int w = src.getWidth();    final int h = src.getHeight();    Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);    Paint paint = new Paint();    Canvas canvas = new Canvas(bitmap);    //绘制原图    canvas.drawBitmap(src, 0, 0, paint);    //绘制提示图片    canvas.drawBitmap(tip, (w - tip.getWidth()), 0, paint);    return bitmapToDrawable(bitmap);  }    /**   * 带倒影的图像   * @param src   * @return   */  public static Bitmap createReflectionBitmap(Bitmap src) {    // 两个图像间的空隙    final int spacing = 4;    final int w = src.getWidth();    final int h = src.getHeight();    // 绘制高质量32位图    Bitmap bitmap = Bitmap.createBitmap(w, h + h / 2 + spacing, Config.ARGB_8888);    // 创建燕X轴的倒影图像    Matrix m = new Matrix();    m.setScale(1, -1);    Bitmap t_bitmap = Bitmap.createBitmap(src, 0, h / 2, w, h / 2, m, true);        Canvas canvas = new Canvas(bitmap);    Paint paint = new Paint();    //  绘制原图像    canvas.drawBitmap(src, 0, 0, paint);    // 绘制倒影图像    canvas.drawBitmap(t_bitmap, 0, h + spacing, paint);    // 线性渲染-沿Y轴高到低渲染    Shader shader = new LinearGradient(0, h + spacing, 0, h + spacing + h / 2, 0x70ffffff, 0x00ffffff, Shader.TileMode.MIRROR);    paint.setShader(shader);    // 取两层绘制交集，显示下层。    paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));    // 绘制渲染倒影的矩形    canvas.drawRect(0, h + spacing, w, h + h / 2 + spacing, paint);    return bitmap;  }      /**   * 独立的倒影图像   * @param src   * @return   */  public static Bitmap createReflectionBitmapForSingle(Bitmap src) {    final int w = src.getWidth();    final int h = src.getHeight();    // 绘制高质量32位图    Bitmap bitmap = Bitmap.createBitmap(w, h / 2, Config.ARGB_8888);    // 创建沿X轴的倒影图像    Matrix m = new Matrix();    m.setScale(1, -1);    Bitmap t_bitmap = Bitmap.createBitmap(src, 0, h / 2, w, h / 2, m, true);    Canvas canvas = new Canvas(bitmap);    Paint paint = new Paint();    // 绘制倒影图像    canvas.drawBitmap(t_bitmap, 0, 0, paint);    // 线性渲染-沿Y轴高到低渲染      Shader shader = new LinearGradient(0, 0, 0, h / 2, 0x70ffffff,        0x00ffffff, Shader.TileMode.MIRROR);    paint.setShader(shader);    // 取两层绘制交集。显示下层。    paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));    // 绘制渲染倒影的矩形    canvas.drawRect(0, 0, w, h / 2, paint);    return bitmap;  }      public static Bitmap createGreyBitmap(Bitmap src) {    final int w = src.getWidth();    final int h = src.getHeight();    Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);    Canvas canvas = new Canvas(bitmap);    Paint paint = new Paint();    // 颜色变换的矩阵    ColorMatrix matrix = new ColorMatrix();    // saturation 饱和度值，最小可设为0，此时对应的是灰度图；为1表示饱和度不变，设置大于1，就显示过饱和    matrix.setSaturation(0);    ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);    paint.setColorFilter(filter);    canvas.drawBitmap(src, 0, 0, paint);    return bitmap;  }    /**   * 保存图片   * @param src   * @param filepath   * @param format:[Bitmap.CompressFormat.PNG,Bitmap.CompressFormat.JPEG]   * @return   */  public static boolean saveImage(Bitmap src, String filepath, CompressFormat format) {    boolean rs = false;    File file = new File(filepath);    try {      FileOutputStream out = new FileOutputStream(file);      if(src.compress(format, 100, out)) {        out.flush();  //写入流      }      out.close();    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }    return rs;  }    /**   * 添加水印效果   * @param src    源位图   * @param watermark  水印   * @param direction  方向   * @param spacing 间距   * @return   */  public static Bitmap createWatermark(Bitmap src, Bitmap watermark, int direction, int spacing) {    final int w = src.getWidth();    final int h = src.getHeight();    Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);    Canvas canvas = new Canvas(bitmap);    canvas.drawBitmap(src, 0, 0, null);    if(direction == LEFT_TOP) {      canvas.drawBitmap(watermark, spacing, spacing, null);    } else if(direction == LEFT_BOTTOM){      canvas.drawBitmap(watermark, spacing, h - watermark.getHeight() - spacing, null);    } else if(direction == RIGHT_TOP) {      canvas.drawBitmap(watermark, w - watermark.getWidth() - spacing, spacing, null);    } else if(direction == RIGHT_BOTTOM) {      canvas.drawBitmap(watermark, w - watermark.getWidth() - spacing, h - watermark.getHeight() - spacing, null);    }    return bitmap;  }      /**   * 合成图像   * @param direction   * @param bitmaps   * @return   */  public static Bitmap composeBitmap(int direction, Bitmap... bitmaps) {    if(bitmaps.length < 2) {      return null;    }    Bitmap firstBitmap = bitmaps[0];    for (int i = 0; i < bitmaps.length; i++) {      firstBitmap = composeBitmap(firstBitmap, bitmaps[i], direction);    }    return firstBitmap;  }  /**   * 合成两张图像   * @param firstBitmap   * @param secondBitmap   * @param direction   * @return   */  private static Bitmap composeBitmap(Bitmap firstBitmap, Bitmap secondBitmap,      int direction) {    if(firstBitmap == null) {      return null;    }    if(secondBitmap == null) {      return firstBitmap;    }    final int fw = firstBitmap.getWidth();    final int fh = firstBitmap.getHeight();    final int sw = secondBitmap.getWidth();    final int sh = secondBitmap.getHeight();    Bitmap bitmap = null;    Canvas canvas = null;    if(direction == TOP) {      bitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh, Config.ARGB_8888);      canvas = new Canvas(bitmap);      canvas.drawBitmap(secondBitmap, 0, 0, null);      canvas.drawBitmap(firstBitmap, 0, sh, null);    } else if(direction == BOTTOM) {      bitmap = Bitmap.createBitmap(fw > sw ? fw : sw, fh + sh, Config.ARGB_8888);      canvas = new Canvas(bitmap);      canvas.drawBitmap(firstBitmap, 0, 0, null);      canvas.drawBitmap(secondBitmap, 0, fh, null);    } else if(direction == LEFT) {      bitmap = Bitmap.createBitmap(fw + sw, sh > fh ? sh : fh, Config.ARGB_8888);      canvas = new Canvas(bitmap);      canvas.drawBitmap(secondBitmap, 0, 0, null);      canvas.drawBitmap(firstBitmap, sw, 0, null);    } else if(direction == RIGHT) {      bitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh,          Config.ARGB_8888);      canvas = new Canvas(bitmap);      canvas.drawBitmap(firstBitmap, 0, 0, null);      canvas.drawBitmap(secondBitmap, fw, 0, null);    }    return bitmap;  }    }