hillary.java

package com.test;
 
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
 
public class MainActivity extends Activity {
     
    private static final String TAG = MainActivity.class.getName();
    private static final String FILENAME = "myFile.txt";
     
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main); // you may need to change this to R.layout.activity_main, or whatever your layout is called
         
        String textToSaveString = "Hello Android";
         
        writeToFile(FILENAME, textToSaveString); // this writes the string to the file (jumps below)
         
        String textFromFileString =  readFromFile(FILENAME); // this reads what you just wrote (jumps below)
         
        if ( textToSaveString.equals(textFromFileString) ) // this tests to see if the before and after are the same (they should be)
            Toast.makeText(getApplicationContext(), "both string are equal", Toast.LENGTH_SHORT).show();
        else
            Toast.makeText(getApplicationContext(), "there is a problem", Toast.LENGTH_SHORT).show();
    }
     
    private void writeToFile(String filename, String data) {
        // this block is similar to what you had before
        try {
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput(filename, Context.MODE_PRIVATE));
            outputStreamWriter.write(data);
            outputStreamWriter.close();
        }
        catch (IOException e) {
            Log.e(TAG, "File write failed: " + e.toString());
        } 
         
    }
 
    private String readFromFile(String filename) {
         
        String ret = "";
         
        try {
            // this is reading the same filename that you saved to
            InputStream inputStream = openFileInput(filename);
             
            if ( inputStream != null ) {
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                String receiveString = ""; // string where text will be stored
                StringBuilder stringBuilder = new StringBuilder();
                 
                while ( (receiveString = bufferedReader.readLine()) != null ) {
                    stringBuilder.append(receiveString); // store each line (should only be one)
                }
                 
                inputStream.close();
                ret = stringBuilder.toString(); // actually store the string
            }
        }
        catch (FileNotFoundException e) {
            Log.e(TAG, "File not found: " + e.toString());
        } catch (IOException e) {
            Log.e(TAG, "Can not read file: " + e.toString());
        }
 
        return ret;
    }
}