Question

我想用onClick方法获取嵌套片段。我无法使用自己的xml工作来获取内部片段。执行后我收到以下错误： 找不到片段InnerFragment的id 0x7f0d0086（com.none.myapp：id / menu_fragment）的视图。 有没有正确的方法来使用Viewpager检索内部片段？

FRAGMENT1 - ＆gt;按钮---＆gt; NESTED FRAGMENT

这是我的MainActivity：

public class MainActivity extends AppCompatActivity {

private SectionsPageAdapter mSectionPageAdapter;
private ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mSectionPageAdapter = new SectionsPageAdapter(getSupportFragmentManager());

    mViewPager = (ViewPager) findViewById(R.id.container);
    setupViewPager(mViewPager);
    //Assigns the ViePager to TabLayout
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);
}
//Defines the number of tabs by setting appropriate fragment and tab name.
private void setupViewPager(ViewPager viewPager){
    SectionsPageAdapter adapter = new SectionsPageAdapter(getSupportFragmentManager());
    adapter.addFragment(new ScanFragment(),"TEST1");
    adapter.addFragment(new FilesFragment(),"TEST2");
    adapter.addFragment(new QuizFragment(),"TEST3");
    viewPager.setAdapter(adapter);

}}

这是外部碎片：

public class TEST1 extends Fragment{
private Button btnTest1;


@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.quiz_layout, container, false);
    btnTest1 = (Button) view.findViewById(R.id.btn1);

    btnTest1.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v) {
            getChildFragmentManager()
                    .beginTransaction()
                    .add(R.id.fragContainer, new InnerFragment())
                    .commit();


        }

    });

    return view;
}

}

这应该是内部碎片：

public class InnerFragment extends Fragment{
public InnerFragment(){

}


@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.inner_fragment, container, false);

    return view;
}}

}

外部xml片段：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragContainer"
android:orientation="vertical">

<Button
    android:id="@+id/btn1"
    android:layout_width="300dp"
    android:layout_height="60dp"
    android:onClick="buttonOnClick"
    android:text="Quiz"
    android:textColor="#ffffff"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="207dp" />

 <FrameLayout
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     />
 </RelativeLayout>

Answer 1

您可以尝试通过标记从分页器中获取片段。

查看寻呼机标记片段及其自己的标记，它是android：switcher：viewId：index。

这是执行此操作的简单方法。

private static String getFragmentTag(int viewPagerId, int fragmentIndex) {
      return "android:switcher:" + viewPagerId+ ":" + fragmentIndex;
}

如何从viewPager获取片段的示例：

String fragmentTag = getFragmentTag(mViewPager.getViewId(), 0);// 0 - is pos of first fragment
Fragment yourFragment = getSupportFragmentManager().findFragmentByTag(fragmentTag);

但据我所知，你想要在片段内部获得片段。所以基本上你需要提供从TEST1片段返回这个片段的方法。

public class TEST1 extends Fragment{
    private Button btnTest1;

    private InnerFragment innerFragment = new InnerFragment()    

            @Nullable
            @Override
            public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
                View view = inflater.inflate(R.layout.quiz_layout, container, false);
                btnTest1 = (Button) view.findViewById(R.id.btn1);

                btnTest1.setOnClickListener(new View.OnClickListener(){
                    public void onClick(View v) {
                        getChildFragmentManager()
                                .beginTransaction()
                                .add(R.id.fragContainer, innerFragment )
                                .commit();


                    }

                });

                return view;
            }

       public InnerFragment getInnerFragment() {
            return innerFragment;
       }

 }

嵌套视图寻呼机与子片段

1 个答案: