u013000532的博客

1.新增键值对的键 public class QuizActivity extends AppCompatActivity { private static final String KEY_INDEX = "index"; ... 2.覆盖onSaveInstanceState(...)方法 @Override public void onSaveInstanceSt

1.在目的Activity添加extra常量 public class CheatActivity extends AppCompatActivity { private static final String EXTRA_ANSWER_IS_TRUE = "com.bignerdranch.android.geoquiz.answer_is_true"; ...  2.目的Ac

1.在activity视图层级结构中为fragment视图安排位置 android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" />  2.创建 UI fragment 定义布局 3.创建fragment类及在o