安卓实现fragment的切换
时间: 2023-12-30 15:04:25 浏览: 33
可以使用FragmentManager来实现fragment的切换,具体步骤如下:
1.在activity_main.xml文件中定义一个FrameLayout用于显示fragment。
2.创建需要切换的fragment,比如FragmentA和FragmentB。
3.在MainActivity中获取FrameLayout的引用并且获取FragmentManager的引用。
4.在MainActivity中定义一个switchFragment()方法,用于切换fragment。在方法内部使用FragmentTransaction将需要切换的fragment添加到FrameLayout中。
5.在onCreate()方法中,调用switchFragment()方法来显示默认的fragment。可以默认显示FragmentA。
代码实现示例:
activity_main.xml文件:
```
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
MainActivity.java文件:
public class MainActivity extends AppCompatActivity {
private FragmentManager fragmentManager;
private FragmentTransaction fragmentTransaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getSupportFragmentManager();
switchFragment(new FragmentA());
}
private void switchFragment(Fragment fragment) {
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame_layout, fragment);
fragmentTransaction.commit();
}
}
FragmentA.java文件:
public class FragmentA extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_a, container, false);
}
}
FragmentB.java文件:
public class FragmentB extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_b, container, false);
}
}
```