java - 无法在外部存储 Android 上创建文件

Question

我想创建一个 .txt 文件并将其存储在 Android 手机的外部存储器中。我将权限添加到我的 Android list 中。当我运行代码时，它没有给我任何错误，但文件从未创建。不确定我做错了什么。

public void createExternalStoragePrivateFile(String data) {
    // Create a path where we will place our private file on external
    // storage.
    File file = new File(myContext.getExternalFilesDir(null), "state.txt");

    try {

        FileOutputStream os = null; 
        OutputStreamWriter out = null;
        os = myContext.openFileOutput(data, Context.MODE_PRIVATE);
        out = new OutputStreamWriter(os);
        out.write(data);
        os.close();

        if(hasExternalStoragePrivateFile()) {
            Log.w("ExternalStorageFileCreation", "File Created");
        } else {
            Log.w("ExternalStorageFileCreation", "File Not Created");
        }

    } catch (IOException e) {
        // Unable to create file, likely because external storage is
        // not currently mounted.
        Log.w("ExternalStorage", "Error writing " + file, e);
    }
}

Answer 1

您需要适当的许可:

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