/**
* 根据宽度从本地图片路径获取该图片的缩略图
*
* @param localImagePath
*本地图片的路径
* @param width
*缩略图的宽
* @param addedScaling
*额外可以加的缩放比例
* @return bitmap 指定宽高的缩略图
*/
public static Bitmap getBitmapByWidth(String localImagePath, int width,
int addedScaling)
{
if (TextUtils.isEmpty(localImagePath))
{
return null;
}
Bitmap temBitmap = null;
try
{
BitmapFactory.Options outOptions = new BitmapFactory.Options();
// 设置该属性为true，不加载图片到内存，只返回图片的宽高到options中。
outOptions.inJustDecodeBounds = true;
// 加载获取图片的宽高
BitmapFactory.decodeFile(localImagePath, outOptions);
int height = outOptions.outHeight;
if (outOptions.outWidth > width)
{
// 根据宽设置缩放比例
outOptions.inSampleSize = outOptions.outWidth / width + 1
+ addedScaling;
outOptions.outWidth = width;
// 计算缩放后的高度
height = outOptions.outHeight / outOptions.inSampleSize;
outOptions.outHeight = height;
}
// 重新设置该属性为false，加载图片返回
outOptions.inJustDecodeBounds = false;
outOptions.inPurgeable = true;
outOptions.inInputShareable = true;
temBitmap = BitmapFactory.decodeFile(localImagePath, outOptions);
}
catch (Throwable t)
{
t.printStackTrace();
}
return temBitmap;
}
