Android中自定义NumberPickerDialog

Android Android中自定义NumberPickerDialog

安卓的api中提供了DataPickerDailog、TimePickerDialog，这种都是比较复杂的数值型选择器。但纯数字选择器Dialog却未提供。
DataPicker、TimePicker都是FrameLayout，而本例使用的NumberPicker却是LinearLayout，具体未深入研究。总之，看起来前2者更亲近，我们要实现的NumberPickerDialog相貌和前2者差不多。
这里的代码也是依照TimePickerDialog仿写。

效果图：

代码：


/*
 * Copyright (C) cuiweiyou.com/崔维友
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.cuiweiyou.view;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.NumberPicker;

import com.cuiweiyou.R;

/**
 * A dialog that prompts the user for the number using a NumberPicker.<br/>
 * 使用NumberPicker获取数值的对话框
 */
public class NumberPickerDialog extends AlertDialog implements OnClickListener, NumberPicker.OnValueChangeListener {

    private final String maxValue = "最大值";
    private final String minValue = "最小值";
    private final String currentValue = "当前值";

    private final NumberPicker mNumberPicker;
    private final NumberPicker.OnValueChangeListener mCallback;

    private int newVal;
    private int oldVal;

    /**
     * @param context 上下文
     * @param callBack 回调器
     * @param maxValueNumber 最大值
     * @param minValueNumber 最小值
     * @param currentValueNumber 当前值
     */
    public NumberPickerDialog(Context context, NumberPicker.OnValueChangeListener callBack, int maxValueNumber, int minValueNumber, int currentValueNumber) {
        super(context, 0);
        
        mCallback = callBack;

        setIcon(0);
        setTitle("设置数字");

        Context themeContext = getContext();
        setButton(BUTTON_POSITIVE, "设置", this);
        setButton(BUTTON_NEGATIVE, "取消", this);

        LayoutInflater inflater = (LayoutInflater) themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.view_number_picker_dialog, null);
        setView(view);
        mNumberPicker = (NumberPicker) view.findViewById(R.id.numberPicker);

        mNumberPicker.setMaxValue(maxValueNumber);
        mNumberPicker.setMinValue(minValueNumber);
        mNumberPicker.setValue(currentValueNumber);
        mNumberPicker.setOnValueChangedListener(this);
    }

    @Override
    public Bundle onSaveInstanceState() {
        Bundle state = super.onSaveInstanceState();
        state.putInt(maxValue, mNumberPicker.getMaxValue());
        state.putInt(minValue, mNumberPicker.getMinValue());
        state.putInt(currentValue, mNumberPicker.getValue());
        return state;
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        int max = savedInstanceState.getInt(maxValue);
        int min = savedInstanceState.getInt(minValue);
        int cur = savedInstanceState.getInt(currentValue);
        mNumberPicker.setMaxValue(max);
        mNumberPicker.setMinValue(min);
        mNumberPicker.setValue(cur);
    }

    @Override
    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
        this.oldVal = oldVal;
        this.newVal = newVal;
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
        case BUTTON_POSITIVE:
            mCallback.onValueChange(mNumberPicker, oldVal, newVal);
            break;
        }
    }
    
    /**
     * <b>功能</b>: setCurrentValue，设置NumberPicker的当前值<br/>
     * @author : weiyou.com <br/>
     * @return 
     */
    public NumberPickerDialog setCurrentValue(int value){
        
        mNumberPicker.setValue(value);
        
        return this;
    }
}

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* Copyright (C) cuiweiyou.com/崔维友

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

package com.cuiweiyou.view;

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.NumberPicker;

import com.cuiweiyou.R;

/**

* A dialog that prompts the user for the number using a NumberPicker.

* 使用NumberPicker获取数值的对话框

public class NumberPickerDialog extends AlertDialog implements OnClickListener, NumberPicker.OnValueChangeListener {

private final String maxValue = "最大值";

private final String minValue = "最小值";

private final String currentValue = "当前值";

private final NumberPicker mNumberPicker;

private final NumberPicker.OnValueChangeListener mCallback;

private int newVal;

private int oldVal;

/**

* @param context 上下文

* @param callBack 回调器

* @param maxValueNumber 最大值

* @param minValueNumber 最小值

* @param currentValueNumber 当前值

public NumberPickerDialog(Context context, NumberPicker.OnValueChangeListener callBack, int maxValueNumber, int minValueNumber, int currentValueNumber) {

super(context, 0);

mCallback = callBack;

setIcon(0);

setTitle("设置数字");

Context themeContext = getContext();

setButton(BUTTON_POSITIVE, "设置", this);

setButton(BUTTON_NEGATIVE, "取消", this);

LayoutInflater inflater = (LayoutInflater) themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

View view = inflater.inflate(R.layout.view_number_picker_dialog, null);

setView(view);

mNumberPicker = (NumberPicker) view.findViewById(R.id.numberPicker);

mNumberPicker.setMaxValue(maxValueNumber);

mNumberPicker.setMinValue(minValueNumber);

mNumberPicker.setValue(currentValueNumber);

mNumberPicker.setOnValueChangedListener(this);

}

@Override

public Bundle onSaveInstanceState() {

Bundle state = super.onSaveInstanceState();

state.putInt(maxValue, mNumberPicker.getMaxValue());

state.putInt(minValue, mNumberPicker.getMinValue());

state.putInt(currentValue, mNumberPicker.getValue());

return state;

}

@Override

public void onRestoreInstanceState(Bundle savedInstanceState) {

super.onRestoreInstanceState(savedInstanceState);

int max = savedInstanceState.getInt(maxValue);

int min = savedInstanceState.getInt(minValue);

int cur = savedInstanceState.getInt(currentValue);

mNumberPicker.setMaxValue(max);

mNumberPicker.setMinValue(min);

mNumberPicker.setValue(cur);

}

@Override

public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

this.oldVal = oldVal;

this.newVal = newVal;

}

@Override

public void onClick(DialogInterface dialog, int which) {

switch (which) {

case BUTTON_POSITIVE:

mCallback.onValueChange(mNumberPicker, oldVal, newVal);

break;

}

/**

* 功能: setCurrentValue，设置NumberPicker的当前值

* @author : weiyou.com

* @return

public NumberPickerDialog setCurrentValue(int value){

mNumberPicker.setValue(value);

return this;

}

这个view_number_picker_dialog.xml布局相当简单，其中仅注册一个NumberPicker：


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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="3.5"
        android:gravity="center"
        android:orientation="horizontal" >

        <NumberPicker
            android:id="@+id/numberPicker"
            android:layout_width="wrap_content"
            android:descendantFocusability="blocksDescendants"
            android:layout_height="wrap_content" />
    </LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<LinearLayout

android:layout_width="match_parent"

android:layout_height="0dp"

android:layout_weight="3.5"

android:gravity="center"

android:orientation="horizontal" >

<NumberPicker

android:id="@+id/numberPicker"

android:layout_width="wrap_content"

android:descendantFocusability="blocksDescendants"

android:layout_height="wrap_content" />

</LinearLayout>

使用：


new NumberPickerDialog(
        this, 
        new OnValueChangeListener() {
            @Override
            public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                Log.e("ard", "所选值：" + picker.getValue() + "，原值：" + oldVal + "，新值：" + newVal); // 新值即所选值
            }
        }, 
        90, // 最大值
        20, // 最小值
        40) // 默认值
.setCurrentValue(55) // 更新默认值
.show();

new NumberPickerDialog(

this,

new OnValueChangeListener() {

@Override

public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

Log.e("ard", "所选值：" + picker.getValue() + "，原值：" + oldVal + "，新值：" + newVal); // 新值即所选值

}

90, // 最大值

20, // 最小值

40) // 默认值

.setCurrentValue(55) // 更新默认值

.show();

整体非常easy，没什么复杂的功能。
看了下NumberPicker的源码，很，长。

声明

本文由 cuiweiyou 原创，转载请注明出处：http://www.gaohaiyan.com/1824.html

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