android Q版本外部存储问题以及获取空间大小问题

Q版本：

1.在manifest 文件中添加权限

2.在application 添加

android:requestLegacyExternalStorage="true"

3.在对应的activity中添加动态获取权限

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, "正在请求权限", Toast.LENGTH_SHORT).show()            //申请权限，特征码自定义为1，可在回调时进行相关判断            ActivityCompat.requestPermissions(                this@MainActivity,                arrayOf(WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE),1)        }    }

获取存储空间：Environment.getExternalStorageDirectory();

判断有sd卡存储存在或者加载

Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED

/** 得到SD可用内存 **/@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 "未装载";}

获取手机默认内置存储空间：

/** 得到系统可用内存 **/@SuppressLint("NewApi")private String getMemFree(){    StatFs fs = new StatFs(Environment.getDataDirectory().getPath());    return Formatter.formatFileSize(this, (fs.getAvailableBytes()));}

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