使用自定义适配器从列表视图中的 Textview 获取文本

Question

我有一个包含 3 个 Textview 的 Listview，我想从这些 textview 中获取所点击项目的特定数据。现在我正在尝试从第一个文本视图中获取数据。问题是，如果我单击项目 1、2、3 等并不重要，因为我总是会从列表视图的第一个项目中获取文本。我认为问题是因为我不知道如何从哪个项目中具体说明我想要哪些数据。这是我的代码： estoque.java:

package com.example.asus.mingausfashionmoda;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;

public class estoque extends ListActivity {
    String qntES;
    String pcES;
    String pvES;
    //list
    protected List<ParseObject> mObject;
    String variable = "camisa";
    // declare class variables
    private ArrayList<Item> m_parts = new ArrayList<Item>();
    private Runnable viewParts;
    private ItemAdapter m_adapter;


    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.estoque_main);

        // instantiate our ItemAdapter class
        m_adapter = new ItemAdapter(this, R.layout.list_item, m_parts);
        setListAdapter(m_adapter);

        // here we are defining our runnable thread.
        viewParts = new Runnable(){
            public void run(){
                handler.sendEmptyMessage(0);
            }
        };

        // here we call the thread we just defined - it is sent to the handler below.
        Thread thread =  new Thread(null, viewParts, "MagentoBackground");
        thread.start();
    }



    private Handler handler = new Handler()
    {
        public void handleMessage(Message msg)
        {
            // create some objects
            // here is where you could also request data from a server
            // and then create objects from that data.

            ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(variable);
            query.findInBackground(new FindCallback<ParseObject>() {
                @Override
                public void done(List<ParseObject> statuslist, ParseException e) {
                    if(e != null){
                        //data successfully retrieved
                        Toast.makeText(estoque.this, "Houve um erro inesperado, tente novamente mais tarde", Toast.LENGTH_LONG).show();
                    }else{
                        //something went wrong
                        mObject = statuslist;
                        for(int i = 0; i<mObject.size(); i++) {
                            ParseObject statusObject = mObject.get(i);
                            String username = statusObject.getString("user");
                            Number qntE = statusObject.getNumber("qnt");
                            qntES = String.valueOf(qntE);
                            Number pcE = statusObject.getNumber("precoC");
                            pcES = String.valueOf(pcE);
                            Number pvE = statusObject.getNumber("precoV");
                            pvES = String.valueOf(pvE);

                            m_parts.add(new Item(qntES, pvES, pcES));

                            m_adapter = new ItemAdapter(estoque.this, R.layout.list_item, m_parts);
                            setListAdapter(m_adapter);
                        }
                    }
                }
            });

            final ListView lv = (ListView) findViewById(android.R.id.list);
            lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> myAdapter, View myView, int myItemInt, long mylng) {
                    TextView ttd = (TextView)findViewById(R.id.toptextdata);
                    System.out.println(ttd.getText().toString());
                    }
            });
        }
    };
}

ItemAdapter.java:

package com.example.asus.mingausfashionmoda;

/**
 * Created by ASUS on 21/12/2015.
 */
import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class ItemAdapter extends ArrayAdapter<Item> {

    // declaring our ArrayList of items
    private ArrayList<Item> objects;

    /* here we must override the constructor for ArrayAdapter
    * the only variable we care about now is ArrayList<Item> objects,
    * because it is the list of objects we want to display.
    */
    public ItemAdapter(Context context, int textViewResourceId, ArrayList<Item> objects) {
        super(context, textViewResourceId, objects);
        this.objects = objects;
    }

    /*
     * we are overriding the getView method here - this is what defines how each
     * list item will look.
     */
    public View getView(int position, View convertView, ViewGroup parent){

        // assign the view we are converting to a local variable
        View v = convertView;
        /** v.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        System.out.println("CARALHO VC CRICOU" + objects);
        }
        }); */
        // first check to see if the view is null. if so, we have to inflate it.
        // to inflate it basically means to render, or show, the view.
        if (v == null) {
            LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = inflater.inflate(R.layout.list_item, null);
        }

        /*
         * Recall that the variable position is sent in as an argument to this method.
         * The variable simply refers to the position of the current object in the list. (The ArrayAdapter
         * iterates through the list we sent it)
         *
         * Therefore, i refers to the current Item object.
         */
        Item i = objects.get(position);

        if (i != null) {

            // This is how you obtain a reference to the TextViews.
            // These TextViews are created in the XML files we defined.

            TextView tt = (TextView) v.findViewById(R.id.toptext);
            TextView ttd = (TextView) v.findViewById(R.id.toptextdata);
            TextView mt = (TextView) v.findViewById(R.id.middletext);
            TextView mtd = (TextView) v.findViewById(R.id.middletextdata);
            TextView bt = (TextView) v.findViewById(R.id.bottomtext);
            TextView btd = (TextView) v.findViewById(R.id.desctext);

            // check to see if each individual textview is null.
            // if not, assign some text!

            if (tt != null){
                tt.setText("Quantidade: ");
            }
            if (ttd != null){
                ttd.setText(i.getName());
            }
            if (mt != null){
                mt.setText("Preco compra: ");
            }
            if (mtd != null){
                mtd.setText("$" + i.getPrice());
            }
            if (bt != null){
                bt.setText("Preco venda: ");
            }
            if (btd != null){
                btd.setText(i.getDetails());
            }
        }

        // the view must be returned to our activity
        return v;
    }
}

Item.java:

package com.example.asus.mingausfashionmoda;

import android.widget.TextView;

public class Item {
    private String details;
    private String name;
    private String price;


    public Item(){

    }

    public Item(String i, String d, String p){
        this.details = d;
        this.name = i;
        this.price = p;

    }

    public String getDetails() {
        return details;
    }

    public void setDetails(String details) {
        this.details = details;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }
}

estoque_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnSelecionarQuery"
        android:text="ROUPA"
        />
    <ListView
        android:id="@+id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true"
        />
    <TextView
        android:id="@+id/android:empty"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="No items to display."/>

</LinearLayout>

list_item.xml:

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

    android:padding="6dip">
    <!-- Item Name -->
    <TextView
        android:id="@+id/toptext"

        android:layout_width="wrap_content"
        android:layout_height="26dip"

        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"

        android:textStyle="bold"
        android:singleLine="true"
        android:ellipsize="marquee"
        />

    <!-- Actual Item Name Data -->
    <TextView
        android:id="@+id/toptextdata"

        android:layout_width="fill_parent"
        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@id/toptext"

        android:singleLine="true"
        android:ellipsize="marquee"
        />

    <!-- Price Tag -->
    <TextView
        android:id="@+id/middletext"

        android:layout_width="wrap_content"
        android:layout_height="26dip"

        android:layout_alignParentLeft="true"
        android:layout_below="@id/toptext"

        android:textStyle="bold"
        android:gravity="center_vertical"
        />

    <!-- Actual Price Data -->
    <TextView
        android:id="@+id/middletextdata"

        android:layout_width="fill_parent"
        android:layout_height="26dip"

        android:layout_alignParentRight="true"
        android:layout_below="@id/toptext"
        android:layout_toRightOf="@id/middletext"

        android:gravity="center_vertical"
        />

    <!-- Description Tag -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"
        android:layout_below="@id/middletext"

        android:textStyle="bold"
        android:id="@+id/bottomtext"
        android:singleLine="false"
        />
    <!-- This is the actual description -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/bottomtext"


        android:id="@+id/desctext"
        android:singleLine="false"
        />
</RelativeLayout>

为了让您更容易理解，这是我从列表视图中获取点击项目并尝试获取它的第一个文本视图文本（这是在 estoque.java 上）：

final ListView lv = (ListView) findViewById(android.R.id.list);
            lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> myAdapter, View myView, int myItemInt, long mylng) {
                    TextView ttd = (TextView)findViewById(R.id.toptextdata);
                    System.out.println(ttd.getText().toString());
                    }
            });

谢谢。

Answer 1

想要从 ListView 的单击行布局访问 View，使用 onItemClick 的第二个参数调用 findViewById，如：

TextView ttd = (TextView) myView.findViewById(R.id.toptextdata);

Answer 2

使您的 textView 最终化，而不是使用 listItemClickListner，在 getView() 中的每个 textview 上使用 onclickListener。

使用自定义适配器从列表视图中的 Textview 获取文本

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