Question

   package table.periodic;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;


public class Solu extends ListActivity {

    String[] formulas={ "Formulas", "Al<sup><small>2</small></sup>(SO<sup><small>4</small></sup>)<sup><small>3</small></sup>"

    };

    String[] C0s={ "0°C", "31.2"

    };

    String[] C20s={ "20°C", "36.4"

    };

    String[] C60s={ "60°C", "59.2"

    };

    String[] C100s={ "100°C", "89.0"

    };

    public static final int ONE_ID = Menu.FIRST+1;
    public static final int TWO_ID = Menu.FIRST+2;
    public static final int THREE_ID = Menu.FIRST+3;
    public static final int FOUR_ID = Menu.FIRST+4;

    public void OnCreate(Bundle icicle){
        super.onCreate(icicle);
        setContentView(R.layout.list);
        setListAdapter(new IconicAdapter());

    }

    class IconicAdapter extends ArrayAdapter<Object>{
        IconicAdapter(){

            super(Solu.this, R.layout.row);

        }


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

        LayoutInflater inflater=getLayoutInflater();
        View row=inflater.inflate(R.layout.row, parent, false);

        TextView formula=(TextView)row.findViewById(R.id.formula);
        TextView C0=(TextView)row.findViewById(R.id.C0);
        TextView C20=(TextView)row.findViewById(R.id.C20);
        TextView C60=(TextView)row.findViewById(R.id.C60);
        TextView C100=(TextView)row.findViewById(R.id.C100);

        formula.setText(formulas[position]);
        C0.setText(C0s[position]);
        C20.setText(C20s[position]);
        C60.setText(C60s[position]);
        C100.setText(C100s[position]);

        return(row);

        }

    }

    public void onListItemClick(ListView parent, View v, int position, long id){


    }

     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo){
            populateMenu(menu);
        }

        public boolean onCreateOptionsMenu(Menu menu){
            populateMenu(menu);

            return(super.onCreateOptionsMenu(menu));

        }
        public boolean onOptionsItemSelected(MenuItem item){
            return(applyMenuChoice(item)||
                    super.onOptionsItemSelected(item));

        }
        public boolean onContextItemSelected(MenuItem item){
            return(applyMenuChoice(item)||
                    super.onContextItemSelected(item));
        }
        private void populateMenu(Menu menu){
            menu.add(Menu.NONE, ONE_ID, Menu.NONE, "Help");
            menu.add(Menu.NONE, TWO_ID, Menu.NONE, "Home");
            menu.add(Menu.NONE, THREE_ID, Menu.NONE, "List");
            menu.add(Menu.NONE, FOUR_ID, Menu.NONE, "Table");
        }

        private boolean applyMenuChoice(MenuItem item){
            switch (item.getItemId()){

            case ONE_ID:

                new AlertDialog.Builder(this)
                .setTitle("Help")
                .setMessage("Solubilities are given in grams of solute that can be dissolved in 100 g of water at the temperature (°C) indicated.")
                .setNeutralButton("Close", new DialogInterface.OnClickListener(){
                    public void onClick(DialogInterface dlg, int sumthin){

                    }
                })
                .show();

                return(true);

            case TWO_ID:

                Intent table = new Intent(this, table.class);
                startActivity(table);
                finish();
                return(true);

            case THREE_ID:

                Intent list = new Intent(this, List.class);
                startActivity(list);
                finish();
                return(true);

            case FOUR_ID:
                Intent Classic = new Intent(this, Classic.class);
                startActivity(Classic);
                finish();
                return(true);

            }
            return false;
        }

        public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            // TODO Auto-generated method stub

        }

        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }

}

XML LIST

XML ROW

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal">
  <TextView android:layout_height="wrap_content" android:textSize="15dp" android:id="@+id/formula" android:text="form" android:layout_width="75dp"></TextView>
  <TextView android:textSize="15dp" android:layout_height="wrap_content" android:text="0C" android:id="@+id/C0" android:layout_width="30dp"></TextView>
  <TextView android:layout_height="wrap_content" android:textSize="15dp" android:id="@+id/C20" android:text="20C" android:layout_width="35dp"></TextView>
  <TextView android:layout_height="wrap_content" android:textSize="15dp" android:id="@+id/C60" android:text="60C" android:layout_width="35dp"></TextView>
  <TextView android:layout_height="wrap_content" android:textSize="15dp" android:id="@+id/C100" android:text="60C" android:layout_width="35dp"></TextView>

</LinearLayout>

Answer 1

您可以提供要在ListView适配器中使用的任意布局，例如SimpleAdapter或ArrayAdapter，因此它可以包含4列以及您想要的内容。

唯一的挑战是您需要为列设置一些显式大小（即宽度视图的百分比layout_weight），而不是基于输入。

您还可以查看使用TableLayout，但它不支持ListView之类的对象重用，因此在某些手机上处理400行时可能也会遇到问题。

XML没有加载

1 个答案: