android - 如何在对话框中使用数字选择器

Question

我想使用数字选择器来从用户那里获得折扣百分比。一旦用户输入销售价格，我希望出现一个对话框，询问折扣百分比。我找不到将数字选择器集成到对话框中的方法。

Answer 1

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 2

我做了一个 NumberPicker 的小演示。这可能并不完美，但您可以使用和修改它。

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

<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>

对话框.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

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 DialogFragment 实现 onCreateDialog 方法，该方法返回包含 NumberPicker 视图的警报对话框。在需要显示数字选择器对话框并显示它的活动中实例化对话框片段。

使宿主活动实现 NumberPicker.OnValueChangeListener 接口，以便对话框中的正负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。

有关更多信息，您可以查看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;
    }
}