ArrayAdapter 的 getView() 方法在加载和滚动列表视图时自动调用

Question

我正在创建自定义列表活动。有两个类，一个具有扩展的 ListActivity，另一个具有用于该列表活动的 ArrayAdapter。此列表视图包含一个文本视图和一个表格布局。

问题是我调用 getView 例如 2 次，它被自动调用三次，当我滚动 lsitview 时，会自动添加一行。

请告诉我为什么会发生这种情况以及我应该做些什么来克服这个问题。

用于生成自定义视图的xml

displayweek.xml

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

    <TextView
        android:id="@+id/tvTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

    <HorizontalScrollView android:id="@+id/horizontalScrollView1" android:layout_width="match_parent" android:layout_height="wrap_content">
               <TableLayout android:layout_width="wrap_content" android:id="@+id/tableLayout1" android:layout_height="wrap_content">
               </TableLayout>
      </HorizontalScrollView>

</LinearLayout>

调用 getview

if (weekAdapter == null) {
            weekAdapter = new weekAdapter(this, 0);
        }
        lvSchedule.setAdapter(weekAdapter);
        weekAdapter.add("true"+","+"10:10Am"+","+"Monday"+","+"Tuesday"+","+"Wednesday"+","+"Thusday"+","+"Friday"
                +","+"Saturday"+","+"Sunday");
        weekAdapter.add("true"+","+"10:10Am"+","+" "+","+" "+","+" "+","+"Sumit"+","+" "+","+" "+","+"Humam");

weekAdapter 类

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ArrayAdapter;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class weekAdapter extends ArrayAdapter<String>{

    Context context;

    public weekAdapter(Context context, int textViewResourceId) {
        super(context, textViewResourceId);
        this.context=context;
    }

    public weekAdapter(Context context, int textViewResourceId, String[] objects) {
        super(context,textViewResourceId, objects);
        this.context=context;
    }



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

        if(convertView==null)
        {
            convertView=LayoutInflater.from(getContext()).inflate(R.layout.displayweek,null);       
        }

        TableLayout table=(TableLayout)convertView.findViewById(R.id.tableLayout1);
        TextView tvTime=(TextView)convertView.findViewById(R.id.tvTime);

        String str=getItem(position);
        String []schedule=str.split(",");
        Log.d("schedule length",""+schedule.length);


        if(schedule[0].trim().equals("true"))
            tvTime.setText(""+schedule[1]);
        else
            tvTime.setText("");

         TableRow tr = new TableRow(context);
         tr.setId(1);
         tr.setTag("");                         
         tr.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
         TextView tvMon = new TextView(context);
         tvMon.setId(1);
         tvMon.setText(""+schedule[2]);
         tvMon.setPadding(2, 0, 5, 0);
         tvMon.setTextColor(Color.BLACK);
         tvMon.setHeight(50);
         tvMon.setGravity(Gravity.RIGHT);
         tr.addView(tvMon);

         TextView tvTue = new TextView(context);
         tvTue.setId(1);
         tvTue.setText(""+schedule[3]);
         tvTue.setPadding(2, 0, 5, 0);
         tvTue.setTextColor(Color.BLACK);
         tvTue.setHeight(50);
         tvTue.setGravity(Gravity.RIGHT);
         tr.addView(tvTue);

         TextView tvWed = new TextView(context);
         tvWed.setId(1);
         tvWed.setText(""+schedule[4]);
         tvWed.setPadding(2, 0, 5, 0);
         tvWed.setTextColor(Color.BLACK);
         tvWed.setHeight(50);
         tvWed.setGravity(Gravity.RIGHT);
         tr.addView(tvWed);

         TextView tvThus = new TextView(context);
         tvThus.setId(1);
         tvThus.setText(""+schedule[5]);
         tvThus.setPadding(2, 0, 5, 0);
         tvThus.setTextColor(Color.BLACK);
         tvThus.setHeight(50);
         tvThus.setGravity(Gravity.RIGHT);
         tr.addView(tvThus);

         TextView tvFri = new TextView(context);
         tvFri.setId(1);
         tvFri.setText(""+schedule[6]);
         tvFri.setPadding(2, 0, 5, 0);
         tvFri.setTextColor(Color.BLACK);
         tvFri.setHeight(50);
         tvFri.setGravity(Gravity.RIGHT);
         tr.addView(tvFri);

         TextView tvSat = new TextView(context);
         tvSat.setId(1);
         tvSat.setText(""+schedule[7]);
         tvSat.setPadding(2, 0, 5, 0);
         tvSat.setTextColor(Color.BLACK);
         tvSat.setHeight(50);
         tvSat.setGravity(Gravity.RIGHT);
         tr.addView(tvSat);

         TextView tvSun = new TextView(context);
         tvSun.setId(1);
         tvSun.setText(""+schedule[8]);
         tvSun.setPadding(2, 0, 5, 0);
         tvSun.setTextColor(Color.BLACK);
         tvSun.setHeight(50);
         tvSun.setGravity(Gravity.RIGHT);
         tr.addView(tvSun);
         table.addView(tr, new TableLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));             
        return convertView;
    }

}

Answer 1

您似乎没有覆盖getCount 方法。此方法应返回行数。

public int getCount () {
    return n; /* where n is the number of row you want */
}

此外，您如何知道要创建的行数？你需要为标题创建一次吗？在这种情况下，您需要在 List 的 headerView 中对其进行膨胀。

getView 被调用是正确的行为，因为适配器试图在运行时膨胀视图以显示在列表中。