getAbsolutePath（） - 無法解析方法 - Android工作室

Question

我開始學習將文件寫入SD卡。然而，我需要一些澄清，因爲我不明白爲什麼我在getAbsolutePath（）（這是由Android工作室檢測到）的錯誤。

public class AndroidFileIO implements FileIO { 
    Context context; 
    AssetManager assets; 
    String externalStoragePath; 

public AndroidFileIO(Context context) { 
    this.context = context; 
    this.assets = context.getAssets(); 
    this.externalStoragePath = Environment.getExternalStorageState().getAbsolutePath() 
        + File.separator; 
} 

謝謝

Answer 1

更改此

this.externalStoragePath = Environment.getExternalStorageState().getAbsolutePath() 
       + File.separator; 

到

this.externalStoragePath = Environment.getExternalStorageDirectory().getAbsolutePath() 
       + File.separator; 

更多信息@

http://developer.android.com/guide/topics/data/data-storage.html#filesExternal

public static String getExternalStorageState() //返回類型爲字符串

Added in API level 1 
Returns the current state of the primary "external" storage device 

public static File getExternalStorageDirectory()

Added in API level 1 
Return the primary external storage directory 

，並期待在文檔爲File

http://developer.android.com/reference/java/io/File.html#getAbsolutePath()

public String getAbsolutePath()

Added in API level 1 
Returns the absolute path of this file. An absolute path is a path that starts at a root of the file system. On Android, there is only one root: /.