Android :: send data in application

AndroidManifest.xml

<application
    android:name="com.devahead.extendingandroidapplication.MyApplication">

...
...

</application>

GetData.java

MyApplication app = (MyApplication) getApplication();
String data = app.getData();

GetPreference.java

SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
boolean value = settings.getBoolean("key", false);

MyApplication.java

public class MyApplication extends Application {
  private String data;
  public String getData() {
      return data;
  }
  public void setData(String data) {
      this.data = data;
  }
}

ReceiveDataWithIntent.java

Bundle bundle = getIntent().getExtras();
String value = bundle.getString("key");

SendDataWithIntent.java

Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
intent.putExtra("key", value);
startActivity(intent);

SetData.java

MyApplication app = (MyApplication) getApplication();
app.setData(someData);

UsePreference.java

SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("key", value);
editor.commit();