Android “sdcard“ File.mkdirs()失败解决办法

如果File的路径是("/sdcard/XXXX");

在AndroidManifest.xml里添加requestLegacyExternalStorag

 <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:requestLegacyExternalStorage="true"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Test"
        tools:targetApi="31">

requestLegacyExternalStorag具体什么意思自己去搜