Question

设想:

用户点击一个顿,并添加一行(火箭)。用户的投入具有价值,并点击生成的纽扣吨。该数值将计算并在编辑文本中展示。

问题: 价值没有计算,也没有在编辑文本中显示。我做了什么错误?

custom_list_item.xml

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

<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:gravity="center">

<EditText
android:id="@+id/name"
android:layout_width="125dp" 
android:layout_height="wrap_content"
android:hint="Name"
android:maxLength="10"
/>

<EditText
android:id="@+id/price"
android:layout_width="80dp" 
android:layout_height="wrap_content"
android:hint="Price"
android:inputType="numberDecimal"
android:maxLength="5"
/>

<Button
android:id="@+id/calculate"
android:layout_width="wrap_content" 
android:layout_height="wrap_content"
android:text="Calculate"
/>

</LinearLayout>

<EditText
android:id="@+id/result"
android:layout_width="150dp" 
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:editable="false" 
android:cursorVisible="false"
android:text="$0.00"
/>

主编:java<<EDITTED>>

public class AdvancedBillSplitter extends Activity{

ArrayList<String> noteList = new ArrayList<String>();
FancyAdapter aa = null;

Button calculate;
//EditText price;
EditText result;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ListView myListView = (ListView)findViewById(R.id.noteList);
    aa = new FancyAdapter();

    myListView.setAdapter(aa);

    myListView.setOnItemClickListener(new OnItemClickListener() {
       public void onItemClick(AdapterView<?> arg0, View arg1,
                 int position, long arg3) {
           EditText price = (EditText)findViewById(R.id.price);
           price = (EditText)findViewById(R.id.price);
           double price1 = Double.parseDouble(price.getText().toString());
           double total = price1 *1.1;
           String resultPrice = Double.toString(total);
           result.setText(resultPrice);
           System.out.println(total);

        }
    });
    aa.notifyDataSetChanged();


    Button btnSimple = (Button)findViewById(R.id.btnSimple);        

    btnSimple.setOnClickListener(new OnClickListener() {
        public void onClick(View v)
        {
            noteList.add(0, "");
            aa.notifyDataSetChanged();

        }
    });        

}

class FancyAdapter extends ArrayAdapter<String>
{
    Button calculate;
    EditText price;
    EditText result;

    FancyAdapter()
    {
        super(AdvancedBillSplitter.this, android.R.layout.simple_list_item_1, noteList);
    }

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

        if(row == null)
        {
            LayoutInflater inflater = getLayoutInflater();
            row = inflater.inflate(R.layout.custom_list_item, null);
        }

        return (row);
    }
}

}

Answer 1

simple addition,

<Button
android:id="@+id/calculate"
android:layout_width="wrap_content" 
android:layout_height="wrap_content"
android:focusable="false"
android:focusableInTouchMode="false"
android:text="Calculate"
/>

由于该清单有2个可集中处理的项目(清单项目和纽伦),因此目前无法追踪点击事件。因此,纽特州不能成为焦点。它仍然收集点击事件。

Answer 2

或许请您使用建议的方法OnItemClickListener (。

Answer 3

1. 斜线

EditText Price = (EditText)findViewById(R.id.price);

页: 1

EditText Price = (EditText)view1.findViewById(R.id.price);

(说明意见1)

另外,您有<条码>限定语ById(两条。

Answer 4

You can use the Handler to update your view.
Like this:

Handler mHandler = new Handler() {
@Override

    public void handleMessage(Message msg) {
        switch (msg.what) {
        case 0:
            aa.notifyDataSetChanged();
            break;
        default:
            break;
        }

    }};

btnSimple.setOnClickListener(new OnClickListener() {
    public void onClick(View v)
    {
        noteList.add(0, "");
        mHandler.sendEmptyMessage(0);
    }
});

Answer 5

您不使用<条码>新调试器View.OnItemClickListener (,可使用new OnItemClickListener()进口import android.widget.AdapterView.OnItemClickListener;

www.un.org/Depts/DGACM/index_spanish.htm Dont有点听众,以了解预定布局以及家长布局(名单见)。如果你们的布局不定,那么控制就会直接转移。

myListViewmyListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1,
                    int position, long arg3) {
                  price = (EditText)findViewById(R.id.price);
                  double price1 = Double.parseDouble(price.getText().toString());
                  double total = price1 *1.1;
                  String resultPrice = Double.toString(total);
                  result.setText(resultPrice);

            }
        });

我认为这可能给你一些想法。一旦数据发生变化,就试图使用<代码>,以示DataSetChanged()方法来更新看法。

一切最好。

class FancyAdapter extends BaseAdapter
{
Button calculate;
EditText price;
EditText result;



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

    @Override
    public Object getItem(int arg0) {
        return null;
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;     

            if(row == null)
            {
                LayoutInflater inflater = getLayoutInflater();
                row = inflater.inflate(R.layout.custom_list_item, null);
            }

            return (row);
    }

}

友情链接