组合ListView和Fragment时应用程序崩溃

时间：2018-06-15 22:28:52

标签： java android listview android-fragments

我是编程新手，我在互联网上找不到任何理想的解决方案，因此我希望你能帮助我 我想编写一个应用程序，它有4个标签，每个标签都有一个ListView。如果我创建的应用程序只有4个选项卡或只有ListView，它工作得很好。但是，当谈到将这两个部分结合起来时，它就不起作用了。它在启动应用程序时开始崩溃 请看看我的代码。我只会显示一个标签java和xml代码，因为它总是一样的。
感谢您抽出宝贵时间。

MainActivity.java 

dtres %>% 
  group_by(t) %>% 
  summarise(mN = mean(new))

activity_main.xml中

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {

    private SectionsPagerAdapter mSectionsPagerAdapter;

    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);

        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));


    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


}

Tab1.java 

<?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.matrix.koks.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:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:layout_weight="1"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/AppTheme.PopupOverlay"
            app:title="@string/app_name">

        </android.support.v7.widget.Toolbar>

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

            <android.support.design.widget.TabItem
                android:id="@+id/tabItem"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_1" />

            <android.support.design.widget.TabItem
                android:id="@+id/tabItem2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_2" />

            <android.support.design.widget.TabItem
                android:id="@+id/tabItem3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_3" />

            <android.support.design.widget.TabItem
                android:id="@+id/tabItem4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_4" />


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

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


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

fragment_1.xml 

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.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

import java.util.ArrayList;


public class Tab1 extends Fragment {

    EditText EditText;
    Button AddBtn;
    Button SubBtn;
    Button ResultBtn;
    Button ResetButton;
    ListView ListView;
    ArrayList<String> ArrayListString;
    ArrayAdapter<String> Adapter;
    ArrayList<Integer> ArrayListInteger;
    int Value;
    int Count;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_1, container, false);

        EditText = (EditText) getView().findViewById(R.id.EnterValueEditText1);
        AddBtn = (Button) getView().findViewById(R.id.AddDataButton1);
        SubBtn = (Button) getView().findViewById(R.id.SubDataButton1);
        ResultBtn = (Button) getView().findViewById(R.id.ResultButton1);
        ResetButton = (Button) getView().findViewById(R.id.ResetButton1);
        ListView = (ListView) getView().findViewById(R.id.ListView1);


        ArrayListString = new ArrayList<String>();
        Adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, ArrayListString);

        ArrayListInteger = new ArrayList<Integer>();

        ListView.setAdapter(Adapter);

        AddBtnClick();
        SubBtnClick();
        ResultButtonClick();
        ResetButtonClick();


        return rootView;
    }
    public void AddBtnClick(){
        AddBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String Number = EditText.getText().toString();
                ArrayListString.add(Number);
                Adapter.notifyDataSetChanged();

                Value = Integer.parseInt(EditText.getText().toString());

                Count += Value;

                EditText.getText().clear();

            }
        });
    }

    public void SubBtnClick(){
        SubBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String Number = EditText.getText().toString();
                ArrayListString.add(Number);
                Adapter.notifyDataSetChanged();

                Value = Integer.parseInt(EditText.getText().toString());

                Count -= Value;

                EditText.getText().clear();
            }
        });
    }

    public void ResultButtonClick(){
        ResultBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                ArrayListString.clear();
                Adapter.notifyDataSetChanged();

                String Final = String.valueOf(Count);

                ArrayListString.add(Final);
                Adapter.notifyDataSetChanged();

            }
        });
    }

    public void ResetButtonClick(){
        ResetButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                ArrayListString.clear();
                Adapter.notifyDataSetChanged();

                Count = 0;
            }
        });


    }

}

logcat的

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/constraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<EditText
    android:id="@+id/EnterValueEditText1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:ems="10"
    android:hint="@string/EditText"
    android:inputType="number"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/AddDataButton1"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:text="@string/AddData"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.275"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/EnterValueEditText1" />

<Button
    android:id="@+id/SubDataButton1"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:text="@string/SubData"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.725"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/EnterValueEditText1" />

<Button
    android:id="@+id/ResultButton1"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="16dp"
    android:text="@string/Result"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.275"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/AddDataButton1" />

    <Button
        android:id="@+id/ResetButton1"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="16dp"
        android:text="@string/Reset"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.725"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/SubDataButton1" />

<ListView
    android:id="@+id/ListView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    app:layout_constraintTop_toBottomOf="@+id/ResultButton1" />


</android.support.constraint.ConstraintLayout>

1 个答案:

答案 0 :(得分：0)

使用FloatingActionButton代替

示例

rootView

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