Android片段中的Textview在横向布局中重复 [英] Textview in android fragment duplicated in landscape layout

问题描述

我正在尝试制作一个包含两个片段的应用程序，一个片段包含一组列表(称为OverviewFragment)，一个片段包含所选组的详细信息(称为DetailsFragment).我希望在纵向模式下一次只能看到一个片段，而在横向模式下都可以同时看到两个片段.

I am trying to make an app with two fragments, one containing a list of groups (called OverviewFragment) and one fragment containing the details of selected group (called DetailsFragment). I want only one fragment to be visible at a time in portrait mode and both to be visible simultaneously in landscape mode.

我有两个问题.首先，人像和风景之间的过渡非常不稳定，并导致各种崩溃，即:空白屏幕，未找到视图"，错误夸大类片段"和重叠渲染".

I have two problems. First of all the transition between portrait and landscape is very unstable and leads to a variety of crashes, i.e: a blank screen, "No view found", "Error inflating class fragment" and "overlapping rendering".

我的另一个更具体的问题是，在横向模式下，包含组名的textview被复制并添加到布局的顶部.对我来说，这很奇怪，因为另一个textview(包含组信息)不会被复制.非常令人困惑！

My other more concrete problem is that when in landscape mode, the textview containing the group name is duplicated and added at the top of the layout. To me this is very strange since the other textview (containing the group info) does NOT get duplicated. Very puzzling!

仅在纵向模式下运行该应用程序即可正常工作，并且不会出现崩溃或文本视图重复的情况.

Running the app in portrait mode alone works fine and I experience no crashes or duplicated textviews.

MainActivity.java

MainActivity.java

package com.example.o2k.lab2naviedition;

import android.net.Uri;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements OverviewFragment.OnOverviewInteractionListener, DetailsFragment.OnDetailsInteractionListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (savedInstanceState != null) { // if we are being restored we dont need to do stuff
            System.out.println("saved");
            return;
        }
        System.out.println("tag is: "+findViewById(R.id.activity_main).getTag());

        if (findViewById(R.id.activity_main).getTag().equals("portrait")) {
            OverviewFragment overFrag = new OverviewFragment();
            System.out.println("PORTRAIT IF ---------------------");
            // Add the fragment to the 'fragment_container' FrameLayout
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.fragment_container, overFrag).commit();

        } else if (findViewById(R.id.activity_main).getTag().equals("landscape")) {
            System.out.println("LANDSCAPE IF ---------------------");
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            transaction.replace(R.id.overview_fragment, new OverviewFragment());
            transaction.replace(R.id.details_fragment, new DetailsFragment());
            transaction.commit();
        }
    }

    @Override
    public void onOverviewInteraction(int position) {
        DetailsFragment detailsFrag = (DetailsFragment)
                getSupportFragmentManager().findFragmentById(R.id.details_fragment);

        Group group = OverviewFragment.getGroups()[position];
        DetailsFragment newFragment = new DetailsFragment();
        Bundle args = new Bundle();
        args.putString("groupName", group.getName());
        args.putString("groupInfo", group.getInfo());
        newFragment.setArguments(args);
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

        if (detailsFrag != null) {
            transaction.replace(R.id.details_fragment, newFragment);
        } else {
            transaction.replace(R.id.fragment_container, newFragment);
            transaction.addToBackStack(null);
        }
        transaction.commit();
    }

    @Override
    public void onDetailsInteraction(Uri uri) {

    }
}

activity_main.xml

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:configChanges="keyboardHidden|orientation|screenSize"
    android:id="@+id/activity_main"
    android:tag="portrait"
    tools:context="com.example.o2k.lab2naviedition.MainActivity">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/fragment_container">
    </FrameLayout>

</LinearLayout>

activity_main.xml(土地)

activity_main.xml (land)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:configChanges="keyboardHidden|orientation|screenSize"
    android:orientation="horizontal"
    android:id="@+id/activity_main"
    android:tag="landscape">

    <fragment android:name="com.example.o2k.lab2naviedition.OverviewFragment"
        android:id="@+id/overview_fragment"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="match_parent" />

    <fragment android:name="com.example.o2k.lab2naviedition.DetailsFragment"
        android:id="@+id/details_fragment"
        android:layout_weight="2"
        android:layout_width="0dp"
        android:layout_height="match_parent" />

</LinearLayout>

OverviewFragment.java

OverviewFragment.java

package com.example.o2k.lab2naviedition;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class OverviewFragment extends ListFragment {

    private OnOverviewInteractionListener mListener;
    private static Group[] groups = {new Group("group 1", "5"), new Group("group 2", "13"),
            new Group("group 3", "12"), new Group("group 4", "32"), new Group("group 5", "45")};

    public OverviewFragment() {
    }

    public static OverviewFragment newInstance(String param1, String param2) {
        OverviewFragment fragment = new OverviewFragment();
        Bundle args = new Bundle();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        int layout = android.R.layout.simple_list_item_1;
        List<String> groupNames = new ArrayList();
        for (Group g: groups
             ) {
            groupNames.add(g.getName());
        }
        setListAdapter(new ArrayAdapter<String>(getActivity(), layout, groupNames));
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_overview, container, false);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        mListener.onOverviewInteraction(position);
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnOverviewInteractionListener) {
            mListener = (OnOverviewInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnOverviewInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnOverviewInteractionListener {
        void onOverviewInteraction(int position);
    }

    public static Group[] getGroups() {
        return groups;
    }
}

DetailsFragment.java

DetailsFragment.java

package com.example.o2k.lab2naviedition;

import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class DetailsFragment extends Fragment {

    private OnDetailsInteractionListener mListener;
    private String groupName;
    private String groupInfo;

    public DetailsFragment() {
    }

    public static DetailsFragment newInstance() {
        DetailsFragment fragment = new DetailsFragment();
        Bundle args = new Bundle();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_details, container, false);
        TextView groupNameTextView = (TextView)v.findViewById(R.id.groupNameText);
        TextView groupInfoTextView = (TextView)v.findViewById(R.id.groupInfoText);
        if (this.getArguments() != null) {
            groupName = this.getArguments().getString("groupName");
            groupInfo = this.getArguments().getString("groupInfo");
        } else {
            groupName = "<emptyNAME>";
            groupInfo = "<emptyINFO>";
        }
        groupInfoTextView.setText("No of members: "+groupInfo);
        groupNameTextView.setText(groupName);
        return v;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnDetailsInteractionListener) {
            mListener = (OnDetailsInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnDetailsInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnDetailsInteractionListener {
        void onDetailsInteraction(Uri uri);
    }
}

推荐答案

尝试使用FrameLayouts代替xml文件中的自定义片段:

try using FrameLayouts instead of your custom fragments in the xml file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:configChanges="keyboardHidden|orientation|screenSize"
    android:orientation="horizontal"
    android:id="@+id/activity_main"
    android:tag="landscape">

    <FrameLayout
        android:id="@+id/overview_fragment"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="match_parent" />

    <FrameLayout
        android:id="@+id/details_fragment"
        android:layout_weight="2"
        android:layout_width="0dp"
        android:layout_height="match_parent" />

</LinearLayout>

以您的方式，您将每个片段创建两次. 祝你好运:)

in your way, you are creating each fragment twice. good luck :)

这篇关于Android片段中的Textview在横向布局中重复的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！