Java.Io.Filenotfoundexception: /Storage/Emulated/0/Notes/Fact50Result.Txt: Open Failed Enoent (No Such File or Directory)

java.io.FileNotFoundException: /storage/emulated/0/Notes/fact50Result.txt: open failed ENOENT (No such file or directory)

As discussed in the comments, you need to request permissions at runtime to allow your app to write to external storage. You can check if your app has the permission already by using checkSelfPermission(). For example:

if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
    // Do the file write
} else {
    // Request permission from the user
    ActivityCompat.requestPermissions(this, 
            new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0);
    ...
}

In order to handle this permission request, you'll also need to implement onRequestPermissionsResult() from OnRequestPermissionsResultCallback, for example:

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case 0:
            // Re-attempt file write
    }
}

Read the documentation for full information.

Android - java.io.FileNotFoundException: /storage/emulated/0/Notes/File.txt: open failed: ENOENT (No such file or directory)

Problem Solved

I used SharedPreferences of Android.
I stored the data in MainActivity and take in in my Class as follow:

• MainActivity

  SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
  SharedPreferences.Editor editor = prefs.edit();
  editor.putString("string_id", InputString); //InputString: from the EditText
  editor.commit();
  

• In my Class to get my data

  SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
  String data = prefs.getString("string_id", "no id"); //no id: default value
  

java.io.FileNotFoundException caught when processing request: /document/raw:/storage/emulated/0/Download/mypdf.pdf (No such file or directory)

I've just fixed a NumberFormat crash in code snippet from this brilliant answer. You can find my answer with code here.

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