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清单中。当我运行代码时，它不会给我任何错误，但该文件从未创建过。不知道我做错了什么

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

File file = new File(myContext.getExternalFilesDir(null), "state.txt");
try {

     FileOutputStream os = new FileOutputStream(file, true); 
     OutputStreamWriter out = new OutputStreamWriter(os);
         out.write(data);
     out.close();
}

Answer 2

您需要适当的权限：

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

Answer 3

我可以使用以下代码在外部存储器上创建文件：

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 = new FileOutputStream(file); 
        OutputStreamWriter out = new OutputStreamWriter(os);

        out.write(data);
        out.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);
    }
}