Question

我正在尝试为我的listview创建一个适配器，我在getview（）上遇到错误，特别是在View itemView = inflater.inflate（R.layout.activity_results，parent，false）上;感谢。

错误表示无法解析activity_results或不是字段

public class testadapter extends BaseAdapter
{
   Context context;
    String[] question;
    String[] answer;

    LayoutInflater inflater;


public testadapter(Context context, String[] question, String[] answer) {
    this.context = context;
    this.question = question;
    this.answer = answer;
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
     return question.length;
}


@Override
public Object getItem(int position) {
    return null;
}

@Override
public long getItemId(int position) {
    return 0;
}

public static class ViewHolder
{
    public TextView txtViewTitle;
}

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

    // Declare Variables
    TextView txtquestion;

    TextView txtanswer;

    inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);


    // Locate the TextViews in listview_item.xml

    View itemView = inflater.inflate(R.layout.activity_results, parent, false);

    txtquestion = (TextView) itemView.findViewById(R.id.text1);



    txtanswer = (TextView) itemView.findViewById(R.id.text2);

    // Capture position and set to the TextViews
    txtquestion.setText(question[position]);
    txtanswer.setText(answer[position]);

    return itemView;
    }
}

Answer 1

检查您运行代码的分辨率的特定布局文件夹中是否存在activity_results.xml。可能需要将此xml复制到其他布局文件夹中。

您需要检查Supporting Different Screens in Android - http://developer.android.com/training/multiscreen/index.htmlhttp://developer.android.com/training/multiscreen/index.html

Answer 2

重新生成R文件可能会解决问题。

在文件资源管理器中右键单击该项目。
选择“清洁项目”
确认清洁操作。

转到“项目”菜单，查看是否选中“自动构建”选项。取消选中它。在文件资源管理器中右键单击项目，然后选择“构建”

Answer 3

// try this way hope this demo help you....

1. Main Xml file for holding "ListView" (activity_main.xml)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ListView
        android:id="@+id/lstMain"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

2. ListItem Xml file for holding "ListView" Items (list_item.xml).
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/txtQns"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/txtAns"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

3. Activity (MainActivity)
public class MainActivity extends Activity {

    private ListView lstMain;
    private MyCustomAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lstMain = (ListView) findViewById(R.id.lstMain);

        String[] questionArray = new String[]{"Qun-1","Qun-2","Qun-3","Qun-4","Qun-5"};
        String[] answerArray = new String[]{"Ans-1","Ans-2","Ans-3","Ans-4","Ans-5"};

        // set adapter dara
        adapter = new MyCustomAdapter(this,questionArray,answerArray);
        lstMain.setAdapter(adapter);

        lstMain.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
                try{
                    Toast.makeText(MainActivity.this,adapter.getItem(pos).toString(),Toast.LENGTH_SHORT).show();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        });

    }

    class MyCustomAdapter extends BaseAdapter
    {
        Context context;
        String[] question;
        String[] answer;


        public MyCustomAdapter(Context context, String[] question, String[] answer) {
            this.context = context;
            this.question = question;
            this.answer = answer;
        }

        @Override
        public int getCount() {
            return question.length;
        }


        @Override
        public Object getItem(int position) {
            return question[position]+"\n"+answer[position];
        }

        @Override
        public long getItemId(int position) {
            return position;
        }



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

            ViewHolder holder;
            if(convertView==null){
                holder = new ViewHolder();
                convertView = LayoutInflater.from(context).inflate(R.layout.list_item,null,false);
                holder.txtQuestion = (TextView) convertView.findViewById(R.id.txtQns);
                holder.txtAnswer = (TextView) convertView.findViewById(R.id.txtAns);

                convertView.setTag(holder);
            }else{
                holder = (ViewHolder)convertView.getTag();
            }

            // Capture position and set to the TextViews
            holder.txtQuestion.setText(question[position]);
            holder.txtAnswer.setText(answer[position]);

            return convertView;
        }
    }

    public static class ViewHolder
    {
        public TextView txtQuestion;
        public TextView txtAnswer;
    }

}

ListView视图无法扩充布局

3 个答案: