Question

我正在研究使用ListView显示人物数量和名称的Android应用程序。但编译器无法识别“champs1”和“champs2”。

public class Second extends Activity {
ListView vue;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.act2);
    vue=(ListView) findViewById(R.id.listV2);

    String [][] rep=new String[][]{{"1","aaaaaaa"  },
                                   {"2","bbbbbbb"  },
                                   { "3","ccccccc" }     };
    List<HashMap<String,String> > list= new ArrayList<HashMap<String, String>>();
    HashMap<String,String> element;
    for(int i=0 ;i<rep.length;i++ ){
         element =new HashMap<String, String>();
        element.put("chmaps1",rep[i][0]);
        element.put("champs2",rep[i][1]);
        list.add(element);
    }
    ListAdapter adapter=new SimpleAdapter(this,
                                           list,
                                           android.R.layout.simple_list_item_2,
                                           new String[] {"chmaps1","champs2"},
                                           new int[] {android.R.id.champs1, android.R.id.champs2 });

  vue.setAdapter(adapter);
}
}

错误：（39,71）错误：找不到符号变量champs1 错误：（39,71）错误：找不到符号变量champs2

Answer 1

enter image description here 将android.R.id.champs1更改为android.R.id.text1

将android.R.id.champs2更改为android.R.id.text2

公共类Second扩展Activity { ListView vue;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_searchable);
    vue = (ListView) findViewById(R.id.listView1);

    String[][] rep = new String[][] { { "1", "aaaaaaa" },
            { "2", "bbbbbbb" }, { "3", "ccccccc" } };
    List<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
    HashMap<String, String> element;
    for (int i = 0; i < rep.length; i++) {
        element = new HashMap<String, String>();
        element.put("chmaps1", rep[i][0]);
        element.put("champs2", rep[i][1]);
        list.add(element);
    }

    ListAdapter adapter = new SimpleAdapter(this, list,
            android.R.layout.simple_list_item_2, new String[] { "chmaps1",
                    "champs2" }, new int[] { android.R.id.text1,
                    android.R.id.text2 });

    vue.setAdapter(adapter);
       }
}

Answer 2

将此代码放入for循环

 HashMap<String, String> element = new HashMap<String, String>();

并且没有问题我认为android.R.id.champs1或R.id.champs1都是正确的。

更改此项而不是此 vue.setAdapter（适配器）

尝试这样 vue.setListAdapter（适配器）;

Answer 3

您正在接受：

  android.R.id.champs1

而不是：

R.id.champs1

另外要小心你有时会调用变量chmaps1，有时会调用champs1。

ListView小部件android

3 个答案: