Android Open Source - 2014-Droid-code Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package cs518.samples.sharedpreferences;
/*from  w w  w.  java2 s .c  o m*/
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.LinearLayout;

/* 
 * Sample using preferences
 * ref: http://developer.android.com/training/basics/data-storage/shared-preferences.html
 */
public class MainActivity extends Activity {
  private static String TAG = "SHPREF";
  private String uidstr, passwdstr;
  private EditText userID, passwd;
  private SharedPreferences prefs;

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

    // no editor needed we're reading values
    prefs = getPreferences(MODE_PRIVATE);

    uidstr = prefs.getString(getString(R.string.uid), "nothing ");
    passwdstr = prefs.getString(getString(R.string.pass), "nothing ");

    // display on UI
    TextView userIDt = (TextView) findViewById(R.id.uidsaved);
    TextView passwdt = (TextView) findViewById(R.id.passwdsaved);
    LinearLayout llsaved = (LinearLayout) findViewById(R.id.resultlayout);

    Log.w(TAG, uidstr);
    Log.w(TAG, passwdstr);
    userIDt.setText(uidstr);
    passwdt.setText(passwdstr);
    llsaved.setVisibility(View.VISIBLE);

  } // onCreate()

  public void saveUserInfo(View view) {
    userID = (EditText) findViewById(R.id.uid);
    passwd = (EditText) findViewById(R.id.passwd);
    uidstr = userID.getText().toString();
    passwdstr = passwd.getText().toString();
    /*
     * logically is better to save the preferences when the data are changed
     */

    // Store values between app instances
    // MODE_PRIVATE: file only accessible by calling app (same UID)

    // done in onCreate()
    // SharedPreferences prefs = getPreferences(MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();

    // set the key/value pairs
    editor.putString(getString(R.string.uid), uidstr);
    editor.putString(getString(R.string.pass), passwdstr);

    // don't forget to commit the changes
    editor.commit();
  }

}

Java Source Code List

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