Android studio / storage / sdcard2 / backup（权限被拒绝）

Question

我尝试将文件从/ data复制到/ storage / sdcard2 / backup，但有例外：

java.io.FileNotFoundException: /storage/sdcard2/test/sauvegarde.mdb (Permission denied)

在我的AndroidManifest中：

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

我的功能：

override fun saveFile(source: String, destination: String) {
    try {
        //File(source).copyTo(File(destination), true)
        val buffer = ByteArray(8192)
        val input = FileInputStream(source)
        val out = FileOutputStream(destination)
        input.use { fileinput ->
            out.use {fileOut->
                while (true){
                    val length = fileinput.read(buffer)
                    if (length<=0)
                        break
                    fileOut.flush()
                    fileOut.close()
                }
            }
            input.close()
        }


        Log.d("success","yes")


    }
    catch (e : IOException){
        Log.d("error :",e.toString())
    }
}

测试许可：

Log.d("permission : ",ContextCompat.checkSelfPermission(this,Manifest.permission.READ_EXTERNAL_STORAGE).toString())
    Log.d("permission : ",ContextCompat.checkSelfPermission(this,Manifest.permission.WRITE_EXTERNAL_STORAGE).toString())

返回：

2018-01-01 03:37:59.807 3943-3943/ch.apptitude.smarthome.tablet D/permission :: 0
2018-01-01 03:37:59.807 3943-3943/ch.apptitude.smarthome.tablet D/permission :: 0

我不明白为什么我不能

Answer 1

    intent = Intent()
    intent.setAction(Intent.ACTION_CREATE_DOCUMENT)
    startActivityForResult(intent,1)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (requestCode==Activity.RESULT_OK){
        if (data != null){
            var test = data.getData()
            Log.d("URI",test.toString())
        }
    }
}

这将导致我的应用程序崩溃