Question

对于重复的问题我很抱歉，但我没有得到我的问题的答案。我使用TabActivity创建应用程序，并尝试从片段本身替换一个片段，我在https://developer.android.com/training/basics/fragments/fragment-ui.html中读取了如何做到这一点，我在我的片段中创建了我想要用另一个替换的接口，我在我的MainActivity中实现了界面，并且在运行我的应用程序时它仍然显示容器本身。

这是我的代码：

主要活动：

public class MainActivity extends FragmentActivity implements New2.OnReplaceFragment {
   private SectionsPagerAdapter mSectionsPagerAdapter;
   private ViewPager mViewPager;
   public static MainActivity instance = null;

   public static MainActivity getInstance(){
       return instance;
   }

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
       mViewPager = (ViewPager) findViewById(R.id.frame_container);
       mViewPager.setAdapter(mSectionsPagerAdapter);
       TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
       tabLayout.setupWithViewPager(mViewPager);
        tabLayout.getTabAt(0).setIcon(R.drawable.icon_info);
        tabLayout.getTabAt(1).setIcon(R.drawable.icon_heart_rate_sensor_jpg);
        tabLayout.getTabAt(2).setIcon(R.drawable.icon_graph_jpg);
        instance = this;
    }
    @Override
    public void onReplaceFragment(Class fragmentClass) {
        Fragment fragment = null;
        try {
            fragment = (Fragment) fragmentClass.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // Insert the fragment by replacing any existing fragment
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.frame_container,fragment);

        // Replace whatever is in the fragment_container view with this fragment,
        // and add the transaction to the back stack so the user can navigate back


        transaction.addToBackStack(null);

        // Commit the transaction
        transaction.commit();
    }

    public static class PlaceholderFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";

        public PlaceholderFragment() {
        }
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            TextView textView = (TextView) rootView.findViewById(R.id.section_label);
            textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
            return rootView;
        }
    }

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            // getItem is called to instantiate the fragment for the given page.
            // Return a PlaceholderFragment (defined as a static inner class below).
            switch (position) {
                case 0:
                  //  New1 tab1 = new New1();
                    return New1.newInstance();
                case 1:
                    return New2.newInstance();
                case 2:
                    return New3.newInstance();
                default:
                    return null;
            }
        }
        @Override
        public int getCount() {
            // Show 3 total pages.
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            switch (position) {
                case 0:
                    return "SECTION 1";
                case 1:
                    return "SECTION 2";
                case 2:
                    return "SECTION 3";
            }
            return null;
        }
    }
}

我要替换的片段

片段：

public class New2 extends Fragment {
    TextView name;
    Button change;
    ImageView image1;
    Animation anime;
    private OnReplaceFragment dataPasser;

    public static New2 newInstance(){
        New2 fragment = new New2();
        return fragment;
    }
    public New2(){

    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
         View rootView = inflater.inflate(R.layout.fragment_new2, container, false);
        name = (TextView) rootView.findViewById(R.id.nameTt);
        change = (Button) rootView.findViewById(R.id.changeBtn);
        image1 = (ImageView) rootView.findViewById(R.id.image1);
        anime = AnimationUtils.loadAnimation(getActivity().getApplicationContext(),R.anim.zoom);
        change.setOnClickListener(changeName);
        return rootView;
    }

    View.OnClickListener changeName = new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            image1.startAnimation(anime);
            Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run(){
                    dataPasser.onReplaceFragment(Result.class);
                }
            },1000);
        }
    };
    public interface OnReplaceFragment {
        public void onReplaceFragment(Class fragmentClass);
    }

    @Override
    public void onAttach(Activity a) {
        super.onAttach(a);
        try {
            dataPasser = (OnReplaceFragment) a;
        } catch (ClassCastException e) {
            throw new ClassCastException(a.toString() + " must implement onDataPass");
        }
    }
}

我要展示的片段

public class Result extends Fragment {

TextView textView;
Button btnBack;
public static Result instance = null;

public static Result getInstance(){
    return instance;
}

public Result() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_result, container, false);
    textView = (TextView) v.findViewById(R.id.text11);
    btnBack = (Button) v.findViewById(R.id.btnBack);
    textView.setText("working!!");
    Toast.makeText(getActivity().getApplicationContext(),"working",Toast.LENGTH_LONG).show();
    return v;
}

}

主要活动XML：

    <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.hercules.tadhosttutrial.MainActivity">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="@dimen/appbar_padding_top"
    android:background="@color/red"
    android:theme="@style/AppTheme.AppBarOverlay">


    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</android.support.design.widget.AppBarLayout>

<android.support.v4.view.ViewPager
    android:id="@+id/frame_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

New2 XML：

<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"
tools:context="com.example.hercules.tadhosttutrial.New2"
android:background="@color/yellow">

<!-- TODO: Update blank fragment layout -->

<Button
    android:id="@+id/changeBtn"
    android:layout_width="80dp"
    android:layout_height="40dp"
    android:layout_gravity="center_horizontal"
    android:text="change"/>

<ImageView
    android:id="@+id/image1"
    android:background="@drawable/icon_complete"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    />

结果XML：

    <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:background="@color/colorAccent"
    tools:context="com.example.hercules.tadhosttutrial.Result">

  <!-- TODO: Update blank fragment layout -->

  <Button
      android:id="@+id/btnBack"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="back"/>

  <TextView
      android:id="@+id/text11"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="WORKING"
      android:layout_centerVertical="true"
      android:layout_centerHorizontal="true"
      android:textSize="70dp"
      />

</RelativeLayout>

Answer 1

我的意思是，将MainActivity作为所有片段的主要容器，使用制表符或只是常规片段，

1-主要活动XML：删除ViewPager，添加FrameLayout代替（使用相同的ID）

2-使用此XML创建新片段TabsFragment：

<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"
tools:context="com.example.hercules.tadhosttutrial.New2"
android:background="@color/yellow">

<android.support.v4.view.ViewPager
    android:id="@+id/frame_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</RelativeLayout>

3-将主要活动的SectionsPagerAdapter和ViewPager初始化为TabsFragment：

这一部分：

private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;

和此：

mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.frame_container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.icon_info);
tabLayout.getTabAt(1).setIcon(R.drawable.icon_heart_rate_sensor_jpg);
tabLayout.getTabAt(2).setIcon(R.drawable.icon_graph_jpg);

4-我认为在新文件中移动SectionsPagerAdapter类也更好。

现在，如果您希望将应用的默认视图作为标签，则可以MainActivity在onCreate()显示TabsFragment，通过调用您的方法：

onReplaceFragment(TabsFragment.class);

现在每件事都应该可以正常工作，因为这里的想法是将主要活动中显示的片段替换为另一个片段在这种情况下TabsFragment，Result和New2

不要替换viewpager片段（因为我告诉你这是通过适配器管理的）而不是通过调用replace()

你可能需要玩这个，它不是最终的代码，只是给你一些想法。

在TabActivity

1 个答案: