Question

i am working on android and trying to read a value from my preference file.
but when i run.a message appears in emulator.the
the application has stopped unexpectedly
here is my preference file name pref.and it is inres/xml

<?xml version="1.0" encoding="utf-8"?>
    <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
        <CheckBoxPreference android:defaultValue="false"
             android:key="@string/first"/>
    </PreferenceScreen>

this is main activity where i am reding the value.

package code.finalwork;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.EditText;

public class FinalWorkActivity extends Activity {
    private String pref_file="pref.xml";
EditText text=(EditText) findViewById(R.id.editText1);
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        SharedPreferences pref=getSharedPreferences(pref_file,Context.MODE_PRIVATE);
       Boolean val= pref.getBoolean("firstuse", true);
       if(val)
       {
            text.setText("first use");
       }
       else
       {
           text.setText("Not first use");
       }


    }
}

please someone figure out the problem.

Answer 1

Try this:

public class FinalWorkActivity extends Activity {
    private String pref_file="pref.xml";
    EditText text;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        text = (EditText) findViewById(R.id.editText1);
        SharedPreferences pref=getSharedPreferences(pref_file,Context.MODE_PRIVATE);
        Boolean val= pref.getBoolean("firstuse", true);
        if(val) {
        text.setText("first use");
        } else {
        text.setText("Not first use");
        }
    }
}

If it doesn’t fix please post the error log.

EDIT: remember that so save preferences you need to do:

SharedPreferences pref = getSharedPreferences(pref_file,Context.MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();          
editor.putBoolean("firstuse", authToken);
editor.commit();