Android编程之图片相关代码集锦

/** 
* @param 位图 
* @return 转化成的字符串 
*/ 
public static String bitmapToString(Bitmap bitmap) { 
 // 将Bitmap转换成字符串 
 String string = null; 
 ByteArrayOutputStream bStream = new ByteArrayOutputStream(); 
 bitmap.compress(CompressFormat.PNG, 100, bStream); 
 byte[] bytes = bStream.toByteArray(); 
 string = Base64.encodeToString(bytes, Base64.DEFAULT); 
 return string; 
} 

/** 
* @param string 字符串 
* @return 转化成的位图 
*/ 
public static Bitmap stringToBitmap(String string) { 
  // 将字符串转换成Bitmap类型 
  Bitmap bitmap = null; 
  try { 
   byte[] bitmapArray; 
   bitmapArray = Base64.decode(string, Base64.DEFAULT); 
   bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length); 
  } catch (Exception e) { 
   e.printStackTrace(); 
  } 
  return bitmap; 
} 

/** 
* @param bitmap Bitmap位图图像 
* @return Drawable 转换后的Drawable对象 
*/ 
public static Drawable bitmapToDrawable(Bitmap bitmap) { 
 if (bitmap == null) 
  return null; 
 if (160 != bitmap.getDensity()) { 
  bitmap.setDensity(160); 
 } 
 return new BitmapDrawable(bitmap); 
} 

/** 
 * @param context 上下文 
 * @param id  图片的资源ID 
 * @return Drawable对象 
 */ 
public static Drawable resourceToDrawable(Context context,int id) { 
 return null == context &＃63; null : bitmapToDrawable(BitmapFactory.decodeResource(context.getResources(), id)); 
} 

/** 
 * @param bytes byte数组 
 * @return drawble对象 
 */ 
public static Drawable byteArrayToDrawable(byte[] bytes) { 
 return null == bytes &＃63; null : bitmapToDrawable(BitmapFactory.decodeByteArray(bytes, 0, bytes.length)); 
} 

/** 
* Drawble对象转Bitmap对象 
* @param drawable drawble对象 
* @return bitmap对象 
*/ 
public static Bitmap drawableToBitmap(Drawable drawable) { 
  return null == drawable &＃63; null : ((BitmapDrawable) drawable).getBitmap(); 
} 

/** 
* @param bytes byte数组 
* @return bitmap对象 
*/ 
public static Bitmap byteArrayToBitmap(byte[] bytes) { 
  return null == bytes &＃63; null : BitmapFactory.decodeByteArray(bytes, 0, bytes.length); 
} 

/** 
* @param bitmap 传入的bitmap 
* @return 去色后的图片Bitmap对象 
*/ 
public static Bitmap toGrayscale(Bitmap bitmap) { 
  int width,height; 
  height = bitmap.getHeight(); 
  width = bitmap.getWidth(); 
  Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); 
  Canvas c = new Canvas(bmpGrayscale); 
  Paint paint = new Paint(); 
  ColorMatrix cm = new ColorMatrix(); 
  cm.setSaturation(0); 
  ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm); 
  paint.setColorFilter(f); 
  c.drawBitmap(bitmap, 0, 0, paint); 
  return bmpGrayscale; 
} 

/** 
* @param url   图片的路径 
* @param requireSize 缩放的尺寸 
* @return 缩放后的图片Bitmap对象 
*/ 
public static Bitmap getScaleImage(String url,int requireSize) { 
  BitmapFactory.Options o = new BitmapFactory.Options(); 
  // 此属性表示图片不加载到内存，只是读取图片的属性，包括图片的高宽 
  o.inJustDecodeBounds = true; 
  BitmapFactory.decodeFile(url, o); 
  int width_tmp = o.outWidth,height_tmp = o.outHeight; 
  int scale = 1; 
  while (true) { 
   if (width_tmp / 2 

/** 
* @param bitmap 图片源 
* @return 处理后的图片Bitmap对象 
*/ 
public static Bitmap createMirro(Bitmap bitmap) { 
  int width = bitmap.getWidth(); 
  int height = bitmap.getHeight(); 
  int shadow_height = 15; 
  int[] pixels = new int[width * height]; 
  bitmap.getPixels(pixels, 0, width, 0, 0, width, height); 
  // shadow effect 
  int alpha = 0x00000000; 
  for (int y = 0; y > 16) & 0xff; 
    int g = (pixels[index] >> 8) & 0xff; 
    int b = pixels[index] & 0xff; 
    pixels[index] = alpha | (r <<16) | (g <<8) | b; 
   } 
   if (y >= (height - shadow_height)) { 
    alpha = alpha + 0x1F000000; 
   } 
  } 
  // invert effect 
  Bitmap bm = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); 
  for (int y = 0; y 

/** 
* @param imagePath 图片保存路径 
* @param bm 被保存的bitmap对象 
*/ 
public static void saveImgToLocal(String imagePath, Bitmap bm) { 
  if (bm == null || imagePath == null || "".equals(imagePath)) { 
   return; 
  } 
  File f = new File(imagePath); 
  if (f.exists()) { 
   return; 
  } else { 
   try { 
    File parentFile = f.getParentFile(); 
    if (!parentFile.exists()) { 
     parentFile.mkdirs(); 
    } 
    f.createNewFile(); 
    FileOutputStream fos; 
    fos = new FileOutputStream(f); 
    bm.compress(Bitmap.CompressFormat.PNG, 100, fos); 
    fos.close(); 
   } catch (FileNotFoundException e) { 
    f.delete(); 
    e.printStackTrace(); 
   } catch (IOException e) { 
    e.printStackTrace(); 
    f.delete(); 
   } 
  } 
}

/** 
* @param imagePath 图片在SDCard中保存的路径 
* @return 返回保存的bitmap对象 
*/ 
public static Bitmap getImageFromLocal(String imagePath) { 
  File file = new File(imagePath); 
  if (file.exists()) { 
   Bitmap bitmap = BitmapFactory.decodeFile(imagePath); 
   file.setLastModified(System.currentTimeMillis()); 
   return bitmap; 
  } 
  return null; 
}

/** 
* 对图片进行压缩，主要是为了解决控件显示过大图片占用内存造成OOM问题。 
* 一般压缩后的图片大小应该和用来展示它的控件大小相近。 
* @param context 上下文 
* @param resId 图片资源Id 
* @param reqWidth 期望压缩的宽度 
* @param reqHeight 期望压缩的高度 
* @return 压缩后的图片 
*/ 
public static Bitmap compressBitmapFromResourse(Context context, int resId, int reqWidth, int reqHeight) { 
  final BitmapFactory.Options optiOns= new BitmapFactory.Options(); 
  /* 
   * 第一次解析时，inJustDecodeBounds设置为true， 
   * 禁止为bitmap分配内存，虽然bitmap返回值为空，但可以获取图片大小 
   */ 
  options.inJustDecodeBounds = true; 
  BitmapFactory.decodeResource(context.getResources(), resId, options); 
  final int height = options.outHeight; 
  final int width = options.outWidth; 
  int inSampleSize = 1; 
  if (height > reqHeight || width > reqWidth) { 
   final int heightRatio = Math.round((float) height / (float) reqHeight);
   final int widthRatio = Math.round((float) width / (float) reqWidth);
   inSampleSize = heightRatio 

private int getMaxMemoryForApp() { 
  int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024); 
  return maxMemory; 
}

/** 
* 将Bitmap处理为圆形的图片 
* @param bitmap 处理之前的位图 
* @return 处理之后的位图 
*/ 
public static Bitmap circlePic(Bitmap bitmap){ 
  int width = bitmap.getWidth(); 
  int height = bitmap.getHeight(); 
  int r = width  h , 左上坐标((w-h)/2, 0) , 右上坐标((w+h)/2, h) 偏移10 
   */ 
  final Rect rect = new Rect( width