activity_main xml:

MainActivity.java

ackage edu.example.appfileoutput; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import java.io.IOException; import java.io.InputStream; import java.util.Scanner; public class MainActivity extends AppCompatActivity { EditText et; TextView tv; int numLines; int num2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); } private void init() { et = findViewById(R.id.editFileName); tv = findViewById(R.id.txtResult); } public static void fourth_root_it(double[] a, int num_vals) { for(int i = 0; i  
Android manifest:
 
           
 
 
 
Strings.xml
 
 Enter the name of the input file 4th Root & Display Status.  
 
data.txt
 
16 81 256 
 
 
 
  Extend Lab Assignment #1 such that, in addition to displaying the 4th-root values in a TextView on the screen, it outputs them to a file (one value per line, and to five decimal places). Include a second EditText field in your GUI to allow the user to enter the name of the desired output file. This output file should be created in your app's external files directory, which can be obtained using the built-in SDK getExternalFiles Dir method. (See handout.) The writing of the 4th-root values to the file should be done from your method processPress, not from within fourth_root_it. REMARKS  The XML code for the second EditText is, for example:  The string edit_outfile would be defined in the file strings.xml as follows: Enter the name of the output file  Test your app with the various input files. Examine the output files produced by your app using Android Studio's Device File Explorer feature (or the adb program) to make certain the app is working properly.  Do not forget to give your app permission to write external files with this line in the manifest:  Extend Lab Assignment #1 such that, in addition to displaying the 4th-root values in a TextView on the screen, it outputs them to a file (one value per line, and to five decimal places). Include a second EditText field in your GUI to allow the user to enter the name of the desired output file. This output file should be created in your app's external files directory, which can be obtained using the built-in SDK getExternalFiles Dir method. (See handout.) The writing of the 4th-root values to the file should be done from your method processPress, not from within fourth_root_it. REMARKS  The XML code for the second EditText is, for example:  The string edit_outfile would be defined in the file strings.xml as follows: Enter the name of the output file  Test your app with the various input files. Examine the output files produced by your app using Android Studio's Device File Explorer feature (or the adb program) to make certain the app is working properly.  Do not forget to give your app permission to write external files with this line in the manifest