android FileNotFoundException错误：创建文件失败 No such file or directory

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在Android真机上测试时报错：java.io.FileNotFoundException: /storage/emulated/0/DownFile/。。。: open failed: ENOENT (No such file or directory)

报错：

java.io.FileNotFoundException: /storage/emulated/0/DownFile/。。。: open failed: ENOENT (No such file or directory)

路径：

 String savePAth = Environment.getExternalStorageDirectory() + "/DownFile/";

创建时一直失败。
需要把路径改为：

String savePAth = getExternalCacheDir()+"/DownFile/";