Android 按指定大小读取图片的实例

public static int[] getImageWH(String path) {
	int[] wh = {-1,-1};
 if (path == null) {
 	return wh;
 }
 File file = new File(path);
 if (file.exists() && !file.isDirectory()) {
  try {
   BitmapFactory.options options = new BitmapFactory.options();
   options.inJustDecodeBounds = true;
   InputStream is = new FileInputStream(path);
   BitmapFactory.decodeStream(is,null,options);
   wh[0] = options.outWidth;
   wh[1] = options.outHeight;
  }
  catch (Exception E) {
   Log.w(tag,"getImageWH Exception.",E);
  }
 }
 return wh;
}
 
public static Bitmap createBitmapByScale(String path,int scalE) {
	Bitmap bm = null;
 try {
 	//获取宽高
  int[] wh = getImageWH(path);
  if (wh[0] == -1 || wh[1] == -1) {
  	return null;
  }

  //读取图片
  BitmapFactory.options options = new BitmapFactory.options();
  options.inSampleSize = Math.max(wh[0]/scale,wh[1]/scalE);
  InputStream is = new FileInputStream(path);
  	bm = BitmapFactory.decodeStream(is,options);
 }
 catch (Exception E) {
 	Log.w(tag,"createBitmapByScale Exception.",E);
 }
 catch (OutOfMemoryError E) {
  Log.w(tag,"createBitmapByScale OutOfMemoryError.",E);
  //TODO: out of memory deal..
 }
 return bm;
}