如何在對話框中使用數字選擇器

Question

我想使用數字選擇器來獲取用戶的折扣百分比。 一旦用戶輸入銷售價格，我想要一個對話框來詢問折扣百分比。 我找不到在對話框中集成numberpicker的方法。

Answer 1

我做了一個NumberPicker的小演示。 這可能不完美，但你可以使用和修改它。

使用自定義對話框並設置數字選擇器。

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

Answer 2

請嘗試以下代碼：

        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

這是其他答案的較短變化

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

創建一個實現onCreateDialog方法的DialogFragment，該方法返回包含NumberPicker視圖的警告對話框。 在活動中實例化對話框片段，您需要在該活動中顯示數字選擇器對話框並顯示它。

使主機活動實現NumberPicker.OnValueChangeListener接口，以便對話框中的正面和負面按鈕單擊事件處理程序可以通過調用接口onValueChange方法從NumberPicker傳遞當前值。

有關更多信息，請參閱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;
    }
}