列表视图选项来启动一个新的活动 [英] List View selection to start a new Activity

问题描述

所以，我正与一个列表视图试图获得当某个项目被选中具体活动开。这是code说我有工作现在。我知道它错了，但我不知道我需要去改变它，使其工作。我想我需要一个意图，并尝试了一些想法，但并没有拿出多少。谢谢你。

 包table.periodic;

进口android.app.ListActivity;
进口android.os.Bundle;
进口android.view.View;
进口android.widget.ArrayAdapter;
进口android.widget.ListView;

公共类列表扩展ListActivity {



的String []元素= {锕，铝，镅
        锑，氩，砒霜，砹，钡，
        锫，铍，铋，bohrium，硼，
        溴，镉，补钙，锎，低碳，
        铈，铯，氯，铬，钴，
        铜，copernicium，锔，darmstadtium，dubnium，
        镝，锿，铒，铕，镄，
        氟，钫，钆，镓，锗，
        金，铪，hassium，氦，钬，
        氢，铟，碘，铱，铁，
        氪，镧，铹，领导，锂，
        镥，镁，锰，meitnerium，钔，
        汞，钼，钕，氖，镎，
        镍，铌，氮，锘，锇，
        氧，钯，磷，铂，钚，
        钋，钾，镨，钷，镤，
        镭，氡，铼，铑，roentgenium，铷，
        钌，rutherfordium，钐，钪，seaborgium，
        硒，硅，银，钠，锶，硫，
        钽，锝，碲，铽，铊，钍，
        铥，锡，钛，钨都，ununhexium，ununoctium
        ununpentium，ununquadium，ununseptium，ununtrium，铀，
        钒，氙，镱，钇，锌，氧化锆};

 公共无效的onCreate（包冰柱）{
    super.onCreate（冰柱）;
    的setContentView（R.layout.list）;
    setListAdapter（新ArrayAdapter＆LT;字符串＆GT;（
            对此，android.R.layout.simple_list_item_1，
            元素））;

 }

 公共无效onListItemClick（ListView的父，视图V，INT位置，
         长ID）{


     如果（锕.equals（元素[位置]））
        {startActivity（Actinium.class）;}

     否则，如果（铝.equals（元素[位置]））
        {startActivity（Aluminum.class）;}



 }
 

解决方案

我已经编辑你的codeA位。您需要在您的布局XML文件中创建一个的ListView 元素，然后在你的Java文件，发现它使用 findViewById

 进口android.app.Activity;
进口android.os.Bundle;
进口android.view.View;
进口android.widget.ArrayAdapter;
进口android.widget.ListView;

公共类List延伸活动{

    的String []元素= {...}; //（略更好的可读性）

    公共无效的onCreate（包冰柱）{
        super.onCreate（冰柱）;

        的setContentView（R.layout.main）;
        ListView的LV =（ListView控件）findViewById（R.id.ListView01）;
        lv.setAdapter（新ArrayAdapter＆LT;字符串＆GT;（
                对此，android.R.layout.simple_list_item_1，
                元素））;
    }

    公共无效onListItemClick（ListView的父，视图V，INT位置，
                                 长ID）{
        //如果（锕.equals（元素[位置]））
        // {startActivity（Actinium.class）;}
        //否则如果（铝.equals（元素[位置]））
        // {startActivity（Aluminum.class）;}
    }
}
 

So I'm working with a list view trying to get specific activities to open when a certain item is selected. This is the code that I'm working with right now. I know its wrong but am not sure what I need to change it make it work. I think I need an intent and tried a few ideas but did not come up with much. Thanks.

package table.periodic;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class List extends ListActivity{



String[] elements={"actinium", "aluminum", "americium", 
        "antimony", "argon", "arsenic", "astatine", "barium", 
        "berkelium", "beryllium", "bismuth", "bohrium", "boron", 
        "bromine", "cadmium", "calcium", "californium", "carbon", 
        "cerium", "cesium", "chlorine", "chromium", "cobalt", 
        "copper", "copernicium", "curium", "darmstadtium", "dubnium", 
        "dysprosium", "einsteinium", "erbium", "europium", "fermium", 
        "fluorine", "francium", "gadolinium", "gallium", "germanium", 
        "gold", "hafnium", "hassium", "helium", "holmium", 
        "hydrogen", "indium", "iodine", "iridium", "iron", 
        "krypton", "lanthanum", "lawrencium", "lead", "lithium", 
        "lutetium", "magnesium", "manganese", "meitnerium", "mendelevium", 
        "mercury", "molybdenum", "neodymium", "neon", "neptunium", 
        "nickel", "niobium", "nitrogen", "nobelium", "osmium", 
        "oxygen", "palladium", "phosphorus", "platinum", "plutonium", 
        "polonium", "potassium", "praseodymium", "promethium", "protactinium", 
        "radium", "radon", "rhenium", "rhodium", "roentgenium", "rubidium", 
        "ruthenium", "rutherfordium", "samarium", "scandium", "seaborgium", 
        "selenium", "silicon", "silver", "sodium", "strontium", "sulfur", 
        "tantalum", "technetium", "tellurium", "terbium", "thallium", "thorium", 
        "thulium", "tin", "titanium", "tungsten", "ununhexium", "ununoctium", 
        "ununpentium", "ununquadium", "ununseptium", "ununtrium", "uranium", 
        "vanadium", "xenon", "ytterbium", "yttrium", "zinc", "zirconium"};

 public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.list); 
    setListAdapter(new ArrayAdapter<String>(
            this, android.R.layout.simple_list_item_1, 
            elements));

 }

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


     if ("actinium".equals(elements[position]))
        {startActivity(Actinium.class);}

     else if ("aluminum".equals(elements[position]))
        {startActivity(Aluminum.class);}



 }

解决方案

I've edited your code a bit. You need to create one ListView element in your layout XML file, and then in your Java file, find it using findViewById:

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class List extends Activity {

    String[] elements = { … };  // (omitted for better legibility)

    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        setContentView(R.layout.main); 
        ListView lv = (ListView)findViewById(R.id.ListView01);
        lv.setAdapter(new ArrayAdapter<String>(
                this, android.R.layout.simple_list_item_1, 
                elements));
    }

    public void onListItemClick(ListView parent, View v, int position,
                                 long id) {
        //if ("actinium".equals(elements[position]))
        //    {startActivity(Actinium.class);}
        //else if ("aluminum".equals(elements[position]))
        //    {startActivity(Aluminum.class);}
    }
}

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