Q版本：

1.在manifest 文件中添加權限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<!-- 讀取擴展存儲，向擴展卡讀取數據，用于讀取緩存定位數據-->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

2.在application 添加

android:requestLegacyExternalStorage="true"

3.在對應的activity中添加 動態獲取權限

private fun applyStoragePermission () {val permissionWrite = ContextCompat.checkSelfPermission(applicationContext, WRITE_EXTERNAL_STORAGE)val permissionRead = ContextCompat.checkSelfPermission(applicationContext, READ_EXTERNAL_STORAGE)if (permissionWrite != PackageManager.PERMISSION_GRANTED || permissionRead != PackageManager.PERMISSION_GRANTED) {//Toast.makeText(this, "正在請求權限", Toast.LENGTH_SHORT).show()//申請權限，特征碼自定義為1，可在回調時進行相關判斷ActivityCompat.requestPermissions(this@MainActivity,arrayOf(WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE),1)}}

獲取存儲空間：Environment.getExternalStorageDirectory();

判斷有sd卡存儲存在或者加載

Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED

/** 得到SD可用內存 **/ @SuppressLint("NewApi") private String getSdFree(){if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ StatFs fs = new StatFs(Environment.getExternalStorageDirectory().getPath());//Android API18之前：fs.getAvailableBlocks()*fs.getBlockSize()return Formatter.formatFileSize(this, (fs.getAvailableBytes()));}return "未裝載"; }

獲取手機默認內置存儲空間：

/** 得到系統可用內存 **/ @SuppressLint("NewApi") private String getMemFree(){StatFs fs = new StatFs(Environment.getDataDirectory().getPath());return Formatter.formatFileSize(this, (fs.getAvailableBytes())); }

?

總結

以上是生活随笔為你收集整理的android Q版本外部存储问题以及获取空间大小问题的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。