如何打造一批选择对话框？ [英] How to create a number picker dialog?

问题描述

我希望能够创建一个对话框，允许用户选择一个号码一个特定范围内。

I want to be able to create a Dialog that allows the user to pick a number from a specified range.

我知道有现有的小部件（如来自quietlycoding和一个接SimonVT），其已经这样做了，但我有很难正确地整合到那些我的应用程序。此外，这些主要部件。我想要的东西，这是非常相似的一个在Android开发者页面教程。

I know that there are existing widgets(like those from quietlycoding and the one by SimonVT) that already does this but I'm having hard time integrating those properly into my application. Also, those are primarily widgets. I want something that is very similar to the one in the android developers page tutorials.

我还检查了NumberPicker的文档，并说要去检查TimePicker和的DatePicker为例子，但他们只展示了如何使用时间和日期选择器，我有一个很难感觉我的$ C $身边方式c和尝试转换的时间选择器只是一个正常的数字选择器。任何人都不会有任何想法从哪里开始？我一直在寻找解决方案，为过去3小时无果。

I also checked the documentation for the NumberPicker and it said to go check the TimePicker and DatePicker for examples but they only show how to use Time and Date pickers and I'm having a hard time feeling my way around the code and trying to convert the Time Picker to just a normal Number Picker. Does anyone have any idea where to start? I've been looking for solutions for the last 3 hours to no avail.

推荐答案

我已经做了一个小的演示NumberPicker的。这可能不是完美的，但你可以使用和修改相同。

I have made a small demo of NumberPicker. This may not be perfect but you can use and modify the same.

public class MainActivity extends Activity implements NumberPicker.OnValueChangeListener
{
    private static TextView tv;
    static Dialog d ;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.textView1);
        Button b = (Button) findViewById(R.id.button11);
         b.setOnClickListener(new OnClickListener()
         {

            @Override
            public void onClick(View v) {
                 show();
            }
            });
           }
     @Override
    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

         Log.i("value is",""+newVal);

     }

    public void show()
    {

         final Dialog d = new Dialog(MainActivity.this);
         d.setTitle("NumberPicker");
         d.setContentView(R.layout.dialog);
         Button b1 = (Button) d.findViewById(R.id.button1);
         Button b2 = (Button) d.findViewById(R.id.button2);
         final NumberPicker np = (NumberPicker) d.findViewById(R.id.numberPicker1);
         np.setMaxValue(100);
         np.setMinValue(0);
         np.setWrapSelectorWheel(false);
         np.setOnValueChangedListener(this);
         b1.setOnClickListener(new OnClickListener()
         {
          @Override
          public void onClick(View v) {
              tv.setText(String.valueOf(np.getValue()));
              d.dismiss();
           }    
          });
         b2.setOnClickListener(new OnClickListener()
         {
          @Override
          public void onClick(View v) {
              d.dismiss();
           }    
          });
       d.show();


    }
}

activity_main.xml

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button11"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="Open" />

</RelativeLayout>

dialog.xml

dialog.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <NumberPicker
        android:id="@+id/numberPicker1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="64dp" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/numberPicker1"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="98dp"
        android:layout_toRightOf="@+id/numberPicker1"
        android:text="Cancel" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button2"
        android:layout_alignBottom="@+id/button2"
        android:layout_marginRight="16dp"
        android:layout_toLeftOf="@+id/numberPicker1"
        android:text="Set" />

</RelativeLayout>

编辑：

在RES /价值/ dimens.xml

under res/values/dimens.xml

<resources>

    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>

</resources>

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