android - 应用程序不断关闭 -csv 文件 - Android 工作室

问题描述

出于某种原因，当我单击创建购物清单按钮时，我的应用程序停止了。它应该做的是转到新屏幕并显示一个列表视图，其中包含从 csv 导入的数据。

我打开了一个新项目，只是将此代码放入 mainactivity.java 和 activity_mainxml，没有任何按钮或背景或其他屏幕，我的 csv 正确显示。那么我传输代码的方式有问题吗？

我的代码如下：

创建.java

package com.app.supermarketaislefinder;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;

public class create extends AppCompatActivity {

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

        InputStream inputStream = getResources().openRawResource(R.raw.shopitems);
        CSVFile csvFile = new CSVFile(inputStream);
        List<String[]> foodList = csvFile.read();
        MyListAdapter adapter=new MyListAdapter(this, R.layout.listrow,R.id.txtid, foodList);
        ListView listView=(ListView)findViewById(R.id.listview);
        listView.setAdapter(adapter);
    }

    private class CSVFile {
        InputStream inputStream;

        public CSVFile(InputStream inputStream){
            this.inputStream = inputStream;
        }

        public List<String[]> read(){
            //
            List<String[]> resultList = new ArrayList<String[]>();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            try {
                String line;
                while ((line = reader.readLine()) != null) {
                    String[] row = line.split(",");
                    resultList.add(row);
                }
            }
            catch (IOException e) {
                Log.e("Main",e.getMessage());
            }
            finally {
                try {
                    inputStream.close();
                }
                catch (IOException e) {
                    Log.e("Main",e.getMessage());
                }
            }
            return resultList;
        }
    }





}

我的列表适配器

package com.app.supermarketaislefinder;

import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class MyListAdapter extends ArrayAdapter<String[]>{
    int groupid;
    List<String[]> items;
    Context context;
    String path;

    public MyListAdapter(Context context, int vg, int id, List<String[]> items){
        super(context,vg, id, items);
        this.context=context;
        groupid=vg;
        this.items=items;

    }
    static class ViewHolder {
        public TextView textid;
        public TextView textname;

    }

    public View getView(int position, View convertView, ViewGroup parent) {

        View rowView = convertView;
        if(rowView==null){
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            rowView= inflater.inflate(groupid, parent, false);
            ViewHolder viewHolder = new ViewHolder();
            viewHolder.textid = (TextView) rowView.findViewById(R.id.aisle);
            viewHolder.textname = (TextView) rowView.findViewById(R.id.item);
            rowView.setTag(viewHolder);
        }
        // Fill data
        ViewHolder holder = (ViewHolder) rowView.getTag();
        String[] row=items.get(position);
        holder.textid.setText(row[0]);
        holder.textname.setText(row[1]);

        return rowView;
    }

}

活动创建.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context=".create"
    android:background="@drawable/createbackground"
    >

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="384dp"
        android:layout_height="117dp"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="16dp"
        android:background="@color/colorCreate"
        android:orientation="vertical"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:id="@+id/appTitle"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fontFamily="@font/bree_serif"
            android:gravity="center"
            android:text="Create your Shopping List"
            android:textColor="@android:color/black"
            android:textSize="34sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout6"
        android:layout_width="384dp"
        android:layout_height="66dp"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="16dp"
        android:background="@color/colorCreateSub"
        android:orientation="vertical"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/linearLayout">

    </LinearLayout>


    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/linearLayout6"
        app:layout_constraintVertical_bias="0.0" />


</android.support.constraint.ConstraintLayout>

list_row.xml

<?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:orientation="horizontal" >

    <TextView
        android:id="@+id/txtid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10sp"
        android:textStyle="bold" >
    </TextView>
    <TextView
        android:id="@+id/txtname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10sp"
        android:textStyle="bold" >
    </TextView>

</LinearLayout>

标签： android

android - 应用程序不断关闭 -csv 文件 - Android 工作室 - 已更新

问题描述

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