Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Android Android Activity Lifecycle Introducing SharedPreferences Saving and Retrieving Data with SharedPreferences

Varun Singh
Varun Singh
1,905 Points

SharedPreferences

Compiler error why?

import android.view.View; import android.os.Bundle; import android.widget.EditText; import android.content.Context; import android.content.SharedPreferences;

public class MainActivity extends Activity { private static final String PREFS_FILE = ""; private static final String KEY_CHECKBOX = "key_checkbox"; private String SharedPreferences.Editor mEditor; private String SharedPreferences mSharedPreferences; public CheckBox mCheckBox;

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);

mCheckBox = (CheckBox) findViewById(R.id.checkBox);
mSharedPrefrences = getSharedPreferences(PREFS_FILE,Context.PRIVATE_MODE);
mEditor = mSharedPrefrences.edit();

} }

MainActivity.java
import android.view.View;
import android.os.Bundle;
import android.widget.EditText;
import android.content.Context;
import android.content.SharedPreferences;

public class MainActivity extends Activity {
  private static final String PREFS_FILE = "";
  private static final String KEY_CHECKBOX = "key_checkbox";
  private String SharedPreferences.Editor mEditor;
  private String SharedPreferences mSharedPreferences;
  public CheckBox mCheckBox;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mCheckBox = (CheckBox) findViewById(R.id.checkBox);
    mSharedPrefrences = getSharedPreferences(PREFS_FILE,Context.PRIVATE_MODE);
    mEditor = mSharedPrefrences.edit();

  }
}

1 Answer

Seth Kroger
Seth Kroger
56,406 Points

You can't declare two different types for a variable. I don't believe that either are supposed to be Strings:

  private String SharedPreferences.Editor mEditor;
  private String SharedPreferences mSharedPreferences;
Varun Singh
Varun Singh
1,905 Points

You are rite Seth, actually my first mistake is that SharedPreferences doesn't have a data type. So in this case we will declare: private SharedPreferences .Editor mEditor; private SharedPreferences mSharedPreferences;

and the second one, was just a spelling error of " SharedPreferences " while assigning editor : "mEditor = mSharedPrefrences.edit();"