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

Yadi Miao
Yadi Miao
3,539 Points

Now declare a SharedPreferences field named mSharedPreferences and an Editor field named mEditor. Then initialize both o

Don't know what's wrong...

MainActivity.java
import android.view.View;
import android.os.Bundle;

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

  // ./MainActivity.java:9: error: cannot find symbol
 // private EditText mEditor;
          ^
  //symbol:   class EditText
  //location: class MainActivity
  //./MainActivity.java:17: error: cannot find symbol
  //  mEditor = (EditText) findViewById(R.id.editText);
               ^
  //symbol:   class EditText
  //location: class MainActivity
  //./MainActivity.java:17: error: cannot find symbol
  //  mEditor = (EditText) findViewById(R.id.editText);
                                          ^
  //symbol:   variable editText
  //location: class id
  //3 errors

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

    mCheckBox = (CheckBox) findViewById(R.id.checkBox);
    mEditor = (EditText) findViewById(R.id.editText);
    mSharedPreferences=getSharedPreferences("PREFS_FILE",Context.MODE_PRIVATE);

  }
}

2 Answers

Boban Talevski
Boban Talevski
24,793 Points

The mEditor field should be of type SharedPreferences.Editor, not an EditText.

On the last part simply initialize mEditor using the code below

mEditor = mSharedPreferences.edit();

But make sure that mEditor is below the initialisation of mSharedPreferences