Question

我在使用ArrayList绑定listview时遇到问题。当点击第一个蔬菜类别时，它应该在列表视图中带来不同的3个元素，但只有第一个元素显示在列表视图中，其他元素没有显示。

这是我的代码（我是Android新手的东西）!!!!!!

它应该带这样的列表

problem_list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<ImageView
    android:id="@+id/problem_imageView"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_marginStart="13dp"
    android:layout_marginTop="13dp" />
<!--app:srcCompat="@drawable/pest" />-->

<TextView
    android:id="@+id/englishName_textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignTop="@+id/problem_imageView"
    android:layout_marginStart="13dp"
    android:layout_toEndOf="@+id/problem_imageView"
    android:fontFamily="monospace"
    android:text="Category English Name"
    android:textAppearance="@style/TextAppearance.AppCompat.Medium" />

<TextView
    android:id="@+id/amharicName_textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignStart="@+id/englishName_textView"
    android:layout_below="@+id/englishName_textView"
    android:layout_marginTop="4dp"
    android:fontFamily="monospace"
    android:text="Amharic Name"
    android:textColor="#000080"
    android:textSize="15sp" />

<TextView
    android:id="@+id/count_textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignEnd="@+id/amharicName_textView"
    android:layout_below="@+id/amharicName_textView"
    android:layout_marginTop="8dp"
    android:fontFamily="monospace"
    android:text="Count"
    android:textColor="#000080"
    android:textSize="14sp" />
</RelativeLayout>

ProblemAdapter.java

package com.packageName;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;



public class ProblemAdapter extends BaseAdapter {

private Context context;
private ArrayList<Integer> listID;
private ArrayList<String> English_Title;
private ArrayList<String> Amharic_Title;
private ArrayList<Integer> count;

public ProblemAdapter(Context context, ArrayList<Integer> listID, 
ArrayList<String> name,ArrayList<String> Amharic_Title,ArrayList<Integer> 
count) {

    this.context = context;
    this.listID = listID;
    this.English_Title = name;
    this.Amharic_Title= Amharic_Title;
    this.count = count;
 }

@Override
public int getCount() {
    return English_Title.size();
}

@Override
public Object getItem(int position) {


    return position;

}

@Override
public long getItemId(int position) {
    return position;
}

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

    if (convertView == null) {
        convertView = View.inflate(context, R.layout.problem_list, null);
    } else {

        ImageView img =  convertView.findViewById(R.id.problem_imageView);
        TextView txtView_Eng =  
    convertView.findViewById(R.id.englishName_textView);
        //TextView txtView_Amc =  
    convertView.findViewById(R.id.amharicName_textView);
        TextView txtView_Count =  
   convertView.findViewById(R.id.count_textView);

        img.setImageResource(listID.get(position));
        txtView_Eng.setText(English_Title.get(position));
        txtView_Amc.setText(Amharic_Title.get(position));
        txtView_Count.setText(count.get(position));

    }

    return convertView;
}
}

problem_category.java

package com.packageName;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListView;

import java.util.ArrayList;

public class problem_category extends AppCompatActivity {

String VegetableCategoryType ;

ListView listView;
ArrayList<Integer> ImageID;
ArrayList<String> English_Title;
ArrayList<String> Amharic_Title;
ArrayList<Integer> count;


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

    // Assigning caller plant to the VegetableCategoryType
    Intent intent = getIntent();
    VegetableCategoryType = intent.getStringExtra("Plant_Name");


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) 
    findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Will be replaced with new action", 
     Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    listView =  findViewById(R.id.category_List_view);

    ImageID  = new ArrayList<>();
    English_Title = new ArrayList<>();
    Amharic_Title = new ArrayList<>();
    count = new ArrayList<>();

    ImageID = getImageID();
    English_Title = getEnglishName();
    Amharic_Title = getAmharicName();
     count = getCount();

    ProblemAdapter pAdapter = new ProblemAdapter(problem_category.this,
    ImageID,English_Title,Amharic_Title,count);
    listView.setAdapter(pAdapter);

    }




@Override
public void finish(){
    super.finish();
    overridePendingTransition(R.anim.slide_in_left,R.anim.slide_out_right);
}

public ArrayList<String> getEnglishName(){
    English_Title= new ArrayList<>();

    English_Title.add("Pest");
    English_Title.add("Disease");
    English_Title.add("Disorder");

    return English_Title;
}

private ArrayList<String> getAmharicName() {
    Amharic_Title= new ArrayList<>();

    Amharic_Title.add("sub-title1");
    Amharic_Title.add("sub-title2");
    Amharic_Title.add("sub-title3");

    return Amharic_Title;
}

public ArrayList<Integer> getImageID(){

    ImageID = new ArrayList<>();

    ImageID.add(R.drawable.pest);
    ImageID.add(R.drawable.disease);
    ImageID.add(R.drawable.disorder_edited);

    return ImageID;
}

public ArrayList<Integer> getCount(){

    count = new ArrayList<>();

    if(VegetableCategoryType == "Cabbage"){
        count.add(3);
        count.add(8);
        count.add(3);


    }else if (VegetableCategoryType =="Pepper"){

        count.add(7);
        count.add(5);
        count.add(2);
    }else if(VegetableCategoryType == "Onion"){

        count.add(2);
        count.add(5);
        count.add(3);
    }else if(VegetableCategoryType == "Tomato"){
        count.add(8);
        count.add(16);
        count.add(5);
    }

    return count;
   }


}

MainActivity click_Listners（）

 public void click_Listeners(){
    cabbageImageView.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View view){
            Intent pCategory = new 
     Intent(getApplicationContext(),problem_category.class);
            pCategory.putExtra("Plant_Name","Cabbage");
            startActivity(pCategory);

   overridePendingTransition(R.anim.slide_in_right,R.anim.slide_out_left);
        }
      });
    }

Answer 1

您没有为创建的新视图设置值。你的getView主体应如下所示：

if (convertView == null) {
        convertView = View.inflate(context, R.layout.problem_list, null);
    } else {

        ImageView img =  convertView.findViewById(R.id.problem_imageView);
        TextView txtView_Eng =  
    convertView.findViewById(R.id.englishName_textView);
        //TextView txtView_Amc =  
    convertView.findViewById(R.id.amharicName_textView);
        TextView txtView_Count =  
   convertView.findViewById(R.id.count_textView);

        img.setImageResource(listID.get(position));
        txtView_Eng.setText(English_Title.get(position));
        txtView_Amc.setText(Amharic_Title.get(position));
        txtView_Count.setText(count.get(position));

    }

    return convertView;

如何将自定义列表添加到listview控件中？

1 个答案: