File f = new File("\\sdcard\\playerInfo.txt ");

This is the classic android issue or read/write/creating files. If your player data text file isn't some large file then you can simply use the internal phone storage and do the following to create a player data file.

Get all the imports setup

1. import java.io.BufferedWriter;
   import java.io.FileWriter;
   import java.io.File;
   import java.io.BufferedReader;
   import java.io.FileReader;
   

Create the necessary variables (I might have missed a few flag that you can define in your code)

1. FileWriter user_data;
   BufferedWriter bw;
   FileReader fro;
   BufferedReader bro;
   

In the setup, call your file function, for example,

1. void Setup() {
2.       check_file();
3. }
   

Then define the functions,

The check_file() function will ensure that there is no duplication of user file and that the same file is used each time.

1. void check_file()
   {
     if((new File("/data/data/processing.android.test.<app_name>/files/Player_Data.txt")).exists()){
       println("User file exists");
       try{
         user_data = new FileWriter("/data/data/processing.android.test.<app_name>/files/Player_Data.txt", true);
         bw = new BufferedWriter(user_data);
         exists_flag = true;
       }catch(IOException e){
         println("Exception at existing file edit: "+e);
         exists_flag = false;
       }
     }else{
       try{
         user_data = new FileWriter("/data/data/processing.android.test.<app_name>/files/Player_Data.txt");
         exists_flag = true;
       }catch(IOException e){
         println("Exception at new file creation: "+e);
         exists_flag = false;
       }
       if(exists_flag){
         println("Creating new player file: "+user_data);
         check_file();
       }
     }
   }
   

The write_file() function will write to the same file:

1. void write_file(String lines)
   {
     try{
       bw.write(lines);
       bw.newLine();
       bw.flush();
     }catch(IOException e)
     {
       println("Exception at write file: "+e);
     }
   }

And finally, the read_file() will read the strings into an arraylist or something:

1. void read_file()
   {
      try
     {
        fro = new FileReader( "/data/data/processing.android.test.<app_name>/files/Player_Data.txt" );
        bro = new BufferedReader( fro );
    
        // declare String variable and prime the read
        String stringRead = bro.readLine( );
     
        while( stringRead != null ) // end of the file
        {
          println(stringRead);
           stringRead = bro.readLine( );  // read next line
        }
    
        bro.close( );
       
     }
    
     catch( IOException e )
     {
       println( "Exception at readfile: "+e );
     }
   }

This worked fine for one of my first games created on the Android platform, so hopefully this should work for you too :)

Let me know if you need any help or if this solution worked for you.