文件访问权限

修改GlobalScreenshot.java的saveImageInBackgroundTask方法：
String imageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).getAbsolutePath();

1、JB2修改为：
String imageDir = StorageManager.getDefaultPath() + '/' + Environment.DIRECTORY_PICTURES ;


2、JB3.TDD修改为：同时需要导入 import com.mediatek.storage.StorageManagerEx;
String imageDir = StorageManagerEx.getDefaultPath() + '/' + Environment.DIRECTORY_PICTURES ;