Question

我想使用数字选择器来获取用户的折扣百分比。一旦用户输入销售价格，我想要一个对话框来询问折扣百分比。我找不到在对话框中集成numberpicker的方法。

Answer 1

我做了一个NumberPicker的小演示。这可能不完美，但你可以使用和修改它。

使用自定义对话框并设置数字选择器。

更多信息@

http://developer.android.com/reference/android/widget/NumberPicker.html

public class MainActivity extends Activity implements NumberPicker.OnValueChangeListener
{
    private 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);// on click of button display the dialog
         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); // max value 100
         np.setMinValue(0);   // min value 0
         np.setWrapSelectorWheel(false);
         np.setOnValueChangedListener(this);
         b1.setOnClickListener(new OnClickListener()
         {
          @Override
          public void onClick(View v) {
              tv.setText(String.valueOf(np.getValue())); //set the value to textview
              d.dismiss();
           }    
          });
         b2.setOnClickListener(new OnClickListener()
         {
          @Override
          public void onClick(View v) {
              d.dismiss(); // dismiss the dialog
           }    
          });
       d.show();


    }
}

activity_main.xml中

<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"
    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

<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>

快照

enter image description here

Answer 2

请尝试以下代码：

        RelativeLayout linearLayout = new RelativeLayout(mContext);
        final NumberPicker aNumberPicker = new NumberPicker(mContext);
        aNumberPicker.setMaxValue(50);
        aNumberPicker.setMinValue(1);

        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(50, 50);
        RelativeLayout.LayoutParams numPicerParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        numPicerParams.addRule(RelativeLayout.CENTER_HORIZONTAL);

        linearLayout.setLayoutParams(params);
        linearLayout.addView(aNumberPicker,numPicerParams);

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(mContext);
        alertDialogBuilder.setTitle("Select the number");
        alertDialogBuilder.setView(linearLayout);
        alertDialogBuilder
                .setCancelable(false)
                .setPositiveButton("Ok",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int id) {
                                Log.e("","New Quantity Value : "+ aNumberPicker.getValue());

                            }
                        })
                .setNegativeButton("Cancel",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                                int id) {
                                dialog.cancel();
                            }
                        });
        AlertDialog alertDialog = alertDialogBuilder.create();
        alertDialog.show();

Answer 3

这是其他答案的较短变体

NumberPicker picker = new NumberPicker(context);
picker.setMinValue(1);
picker.setMaxValue(50);

FrameLayout layout = new FrameLayout(context);
layout.addView(picker, new FrameLayout.LayoutParams(
        FrameLayout.LayoutParams.WRAP_CONTENT,
        FrameLayout.LayoutParams.WRAP_CONTENT,
        Gravity.CENTER));

new AlertDialog.Builder(context)
        .setView(layout)
        .setPositiveButton(android.R.string.ok, (dialogInterface, i) -> {
            // do something with picker.getValue()
            picker.getValue();
        })
        .setNegativeButton(android.R.string.cancel, null)
        .show();

Answer 4

创建一个实现onCreateDialog方法的DialogFragment，该方法返回包含NumberPicker视图的警告对话框。在活动中实例化对话框片段，您需要在该活动中显示数字选择器对话框并显示它。

使主机活动实现NumberPicker.OnValueChangeListener接口，以便对话框中的正面和负面按钮单击事件处理程序可以通过调用接口onValueChange方法从NumberPicker传递当前值。

有关详细信息，请参阅http://www.zoftino.com/android-numberpicker-dialog-example。

public class NumberPickerDialog extends DialogFragment {
    private NumberPicker.OnValueChangeListener valueChangeListener;

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {

            final NumberPicker numberPicker = new NumberPicker(getActivity());

            numberPicker.setMinValue(20);
            numberPicker.setMaxValue(60);

            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            builder.setTitle("Choose Value");
            builder.setMessage("Choose a number :");

            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    valueChangeListener.onValueChange(numberPicker,
                            numberPicker.getValue(), numberPicker.getValue());
                }
            });

        builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                valueChangeListener.onValueChange(numberPicker,
                        numberPicker.getValue(), numberPicker.getValue());
            }
        });

        builder.setView(numberPicker);
        return builder.create();
    }

    public NumberPicker.OnValueChangeListener getValueChangeListener() {
        return valueChangeListener;
    }

    public void setValueChangeListener(NumberPicker.OnValueChangeListener valueChangeListener) {
        this.valueChangeListener = valueChangeListener;
    }
}

如何在对话框中使用数字选择器

4 个答案: