我想它的权限问题，加上这两个以清单文件

i think its permissions issue add both of these to Manifest file

<uses-permission android:name="android.permisson.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

让我知道它是如何变成了

let me know how it turns out