android 片段中的 Textview 在横向布局中重复

Question

我正在尝试制作一个包含两个片段的应用程序，一个包含组列表（称为 OverviewFragment），另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显示一个片段，在横向模式下同时显示两个片段。

我有两个问题。首先，纵向和横向之间的转换非常不稳定，会导致各种崩溃，即：黑屏、"No view found"、"Error inflating class fragment" 和 "overlapping rendering"。

我的另一个更具体的问题是，在横向模式下，包含组名称的文本视图被复制并添加到布局的顶部。对我来说这很奇怪，因为另一个文本视图（包含组信息）不会被复制。很费解！

运行仅纵向模式下的应用程序运行良好，我没有遇到崩溃或重复文本视图的情况。

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

<?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）

<?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

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

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);
    }
}

Answer 1

尝试使用 FrameLayouts 而不是 xml 文件中的自定义片段：

<?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，您正在创建每个片段两次。祝你好运:)

android 片段中的 Textview 在横向布局中重复

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