Android EditText限制只能输入整数和小数，且数字总长度小于等于11位（可自定义），整数5位（可自定义），小数5位（可自定义）

以下代码在项目里，项目地址：https://gitee.com/urasaki/RxJava2AndRetrofit2

1、修改页面的layout。

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

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="@dimen/dp_75"
        android:background="@color/color_FF198CFF"
        android:minHeight="?attr/actionBarSize"
        android:orientation="vertical"
        app:contentInsetStart="0dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_75"
            android:orientation="vertical">

            <View
                android:layout_width="match_parent"
                android:layout_height="@dimen/dp_25" />

            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="@dimen/dp_50">

                <FrameLayout
                    android:id="@+id/layout_back"
                    android:layout_width="@dimen/dp_36"
                    android:layout_height="match_parent"
                    android:gravity="start"
                    tools:ignore="UselessParent">

                    <ImageView
                        android:id="@+id/imv_back"
                        android:layout_width="@dimen/dp_6"
                        android:layout_height="@dimen/dp_11"
                        android:layout_gravity="center"
                        android:src="@mipmap/icon_arrowhead_left"
                        tools:ignore="ContentDescription" />

                </FrameLayout>

                <TextView
                    android:id="@+id/tev_title"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/dp_50"
                    android:gravity="center"
                    android:text="@string/edit_text_input_limits"
                    android:textColor="@color/color_FFFFFFFF"
                    android:textSize="@dimen/sp_20" />

            </FrameLayout>

        </LinearLayout>

    </androidx.appcompat.widget.Toolbar>

    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/dp_50" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:gravity="center"
        android:paddingStart="@dimen/dp_10"
        android:paddingEnd="@dimen/dp_10"
        android:text="Android EditText限制只能输入整数和小数，且数字总长度小于等于11位（可自定义），整数5位（可自定义），小数5位（可自定义）"
        android:textColor="@color/black"
        android:textSize="@dimen/sp_16" />

    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/dp_50" />

    <TextView
        android:id="@+id/tev_show_input"
        android:layout_width="@dimen/dp_280"
        android:layout_height="@dimen/dp_40"
        android:layout_gravity="center_horizontal"
        android:background="@drawable/corners_14_color_white_stroke_1_color_80000000"
        android:gravity="center"
        android:textColor="@color/colorBlack333"
        android:textSize="@dimen/sp_16"
        tools:ignore="Autofill,LabelFor,TextFields" />

    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/dp_50" />

    <TextView
        android:id="@+id/tev_start_input"
        android:layout_width="wrap_content"
        android:layout_height="@dimen/dp_40"
        android:layout_gravity="center_horizontal"
        android:background="@drawable/corners_14_color_white_stroke_1_color_80000000"
        android:gravity="center"
        android:paddingStart="@dimen/dp_10"
        android:paddingEnd="@dimen/dp_10"
        android:text="start input"
        android:textColor="@color/black"
        android:textSize="@dimen/sp_16" />


</LinearLayout>

2、初始化EditText，并设置输入数字总长度小于等于11位（可自定义），整数5位（可自定义），小数5位（可自定义）。

private Toolbar toolbar;
    private FrameLayout layoutBack;
    private ImageView imvBack;
    private TextView tevTitle;
    private TextView tevShowInput;
    private TextView tevStartInput;
        
toolbar = (Toolbar) findViewById(R.id.toolbar);
        layoutBack = (FrameLayout) findViewById(R.id.layout_back);
        imvBack = (ImageView) findViewById(R.id.imv_back);
        tevTitle = (TextView) findViewById(R.id.tev_title);
        tevShowInput = (TextView) findViewById(R.id.tev_show_input);
        tevStartInput = (TextView) findViewById(R.id.tev_start_input);

        setToolbar(false, R.color.color_FF198CFF);
        imvBack.setColorFilter(ContextCompat.getColor(rxAppCompatActivity, R.color.white));

        tevStartInput.setOnClickListener(v -> {
            showDecimalAlertDialog();
        });

3、添加showDecimalAlertDialog方法，注意：如果输入特殊小数或整数，如：.或.15或10.或00035或输入21153.67589，然后删除中间小数点，整数就是10位了（整数不能大于5位），则要在点击Dialog确认按钮之前进行提示，这样就不会填入不符合规范的整数或小数了。

private void showDecimalAlertDialog() {
        View view = LayoutInflater.from(this).inflate(R.layout.dialog_layout_edit_text_input_limits, null, false);
        EditText edtInput = (EditText) view.findViewById(R.id.edt_input);
        TextView tevCancel = (TextView) view.findViewById(R.id.tev_cancel);
        TextView tevConfirm = (TextView) view.findViewById(R.id.tev_confirm);
        //小数点前边几位（修改这里可以自定义）
        int beforeDecimalNum = 5;
        //小数点后边几位（修改这里可以自定义）
        int afterDecimalNum = 5;
        //最大长度是多少位（修改这里可以自定义）
        int maxLength = 11;
        //输入的类型可以是整数或小数
        edtInput.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);
        DecimalInputFilter decimalInputFilter = new DecimalInputFilter(beforeDecimalNum, afterDecimalNum);
        //输入总长度多少位，小数几位（修改这里可以自定义）
        InputFilter[] inputFilter = {new InputFilter.LengthFilter(maxLength), decimalInputFilter};
        edtInput.setFilters(inputFilter);
        edtInput.addTextChangedListener(new DecimalTextWatcher(edtInput, afterDecimalNum));

        @SuppressLint("RestrictedApi")
        AlertDialog alertDialog = new AlertDialog.Builder(this, R.style.dialog_decimal_style)
                .setView(view, 0, 0, 0, 0)
                .show();

//        int widthPx = ScreenManager.getScreenWidth(this);
//        int widthDp = ScreenManager.pxToDp(this, widthPx);
//        int heightPx = ScreenManager.getScreenHeight(this);
//        int heightDp = ScreenManager.pxToDp(this, heightPx);
//        LogManager.i(TAG, "widthDp*****" + widthDp);
//        LogManager.i(TAG, "heightDp*****" + heightDp);

        tevCancel.setOnClickListener(v -> {
            MineInputMethodManager.hideInputMethod(this);
            alertDialog.dismiss();
        });
        tevConfirm.setOnClickListener(v -> {
            String afterData = edtInput.getText().toString();
            if (!"".equals(afterData)) {
                if (afterData.contains(".")) {
                    String[] afterDataArr = afterData.split("\.");
                    if ("".equals(afterDataArr[0])) {
                        Toast.makeText(this, "请输入正常整数或小数", Toast.LENGTH_SHORT).show();
                    } else if (afterDataArr.length == 1) {//当afterData是这种类型的小数时（0. 100.）
                        Toast.makeText(this, "请输入正常整数或小数", Toast.LENGTH_SHORT).show();
                    } else {
                        this.tevShowInput.setText(edtInput.getText().toString());
                        alertDialog.dismiss();
                    }
                } else {
                    if (afterData.length() <= beforeDecimalNum) {
                        String[] afterDataArr = afterData.split("");
                        if (afterDataArr.length > 1 && "0".equals(afterDataArr[1])) {
                            Toast.makeText(this, "请输入正常整数或小数", Toast.LENGTH_SHORT).show();
                        } else {
                            this.tevShowInput.setText(edtInput.getText().toString());
                            alertDialog.dismiss();
                        }
                    } else {
                        Toast.makeText(this, "整数长度不能大于" + beforeDecimalNum + "位", Toast.LENGTH_SHORT).show();
                    }
                }
            } else {
                Toast.makeText(this, "请输入整数或小数", Toast.LENGTH_SHORT).show();
            }
        });


        alertDialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
        alertDialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        edtInput.setFocusable(true);
        edtInput.setFocusableInTouchMode(true);
        edtInput.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if (hasFocus) {
                    MineInputMethodManager.showInputMethod(EditTextInputLimitsActivity.this, edtInput);
                } else {

                }
            }
        });
        edtInput.requestFocus();
    }

4、添加自定义Dialog的layout。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="@dimen/dp_300"
    android:layout_height="@dimen/dp_240"
    android:background="@drawable/corners_14_color_white"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="@dimen/dp_300"
        android:layout_height="@dimen/dp_240"
        android:orientation="vertical"
        tools:ignore="UselessParent">

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_20" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_40"
            android:layout_gravity="center_horizontal"
            android:gravity="center"
            android:paddingStart="@dimen/dp_10"
            android:paddingEnd="@dimen/dp_10"
            android:text="Decimal"
            android:textColor="@color/blue"
            android:textSize="@dimen/sp_16" />

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_20" />

        <EditText
            android:id="@+id/edt_input"
            android:layout_width="@dimen/dp_240"
            android:layout_height="@dimen/dp_40"
            android:layout_gravity="center_horizontal"
            android:background="@drawable/corners_14_color_white_stroke_1_color_80000000"
            android:gravity="center_vertical"
            android:paddingStart="@dimen/dp_15"
            android:paddingEnd="@dimen/dp_15"
            android:textColor="@color/colorBlack333"
            android:textSize="@dimen/sp_16" />

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_20" />

        <FrameLayout
            android:layout_width="@dimen/dp_200"
            android:layout_height="@dimen/dp_40"
            android:layout_gravity="center_horizontal">

            <TextView
                android:id="@+id/tev_cancel"
                android:layout_width="@dimen/dp_80"
                android:layout_height="@dimen/dp_40"
                android:layout_gravity="start"
                android:background="@drawable/corners_14_color_white_stroke_1_color_80000000"
                android:gravity="center"
                android:paddingStart="@dimen/dp_10"
                android:paddingEnd="@dimen/dp_10"
                android:text="cancel"
                android:textColor="@color/color_80000000"
                android:textSize="@dimen/sp_16" />

            <TextView
                android:id="@+id/tev_confirm"
                android:layout_width="@dimen/dp_80"
                android:layout_height="@dimen/dp_40"
                android:layout_gravity="end"
                android:background="@drawable/corners_14_color_white_stroke_1_color_blue"
                android:gravity="center"
                android:paddingStart="@dimen/dp_10"
                android:paddingEnd="@dimen/dp_10"
                android:text="confirm"
                android:textColor="@color/blue"
                android:textSize="@dimen/sp_16" />

        </FrameLayout>
    </LinearLayout>

</LinearLayout>

5、在res文件夹的drawable文件夹新建几个xml文件，并把一下的xml代码复制进去。

corners_14_color_white的drawable文件

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <corners android:radius="@dimen/dp_14" />
    <solid android:color="@color/white" />
</shape>





corners_14_color_white_stroke_1_color_80000000的drawable文件

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <corners android:radius="@dimen/dp_14" />
    <solid android:color="@color/white" />
    <stroke
        android:width="@dimen/dp_1"
        android:color="@color/color_80000000" />
</shape>




corners_14_color_white_stroke_1_color_blue的drawable文件

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <corners android:radius="@dimen/dp_14" />
    <solid android:color="@color/white" />
    <stroke
        android:width="@dimen/dp_1"
        android:color="@color/blue" />
</shape>

6、添加DecimalInputFilter类。

package com.phone.common_library.common;

import android.text.InputFilter;
import android.text.Spanned;

public class DecimalInputFilter implements InputFilter {

    private static final String TAG = DecimalInputFilter.class.getSimpleName();
    //小数点前边几位
    private int beforeDecimalNum;
    //小数点后边几位
    private int afterDecimalNum;

    public DecimalInputFilter(int beforeDecimalNum, int afterDecimalNum) {
        this.beforeDecimalNum = beforeDecimalNum;
        this.afterDecimalNum = afterDecimalNum;
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        String beforeData = dest.toString();
        String inputData = source.toString();
        if (source.length() == 0 && dend > dstart) {
            //删除操作

            //使用系统的
            return null;
        } else {
            //输入操作
            if (beforeData.contains(".")) {
                String[] beforeDataArr = beforeData.split("\.");
                if (beforeDataArr.length > 1 && beforeDataArr[0].length() >= beforeDecimalNum && beforeDataArr[1].length() >= afterDecimalNum) {
                    //返回自定义的
                    return "";
                } else if (beforeDataArr.length >= 1 && beforeDataArr[0].length() >= beforeDecimalNum && dstart <= beforeDecimalNum) {
                    //返回自定义的
                    return "";
                } else if (beforeDataArr.length > 1 && beforeDataArr[1].length() >= afterDecimalNum && dend >= beforeDecimalNum) {
                    //返回自定义的
                    return "";
                }
            } else {
                if (beforeData.length() >= beforeDecimalNum && !inputData.equals(".")) {
                    //返回自定义的
                    return "";
                }
            }
        }


        //使用系统的
        return null;
    }

}

7、添加DecimalTextWatcher类。

package com.phone.common_library.common;

import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.widget.EditText;

public class DecimalTextWatcher implements TextWatcher {

    private static final String TAG = DecimalTextWatcher.class.getSimpleName();
    private String beforeData;
    private String[] beforeDataArr;
    private EditText editText;
    //小数点后边几位
    private int afterDecimalNum;
    //    private OnCommonSingleParamCallback<String> onCommonSingleParamCallback;
    private int index;

    public DecimalTextWatcher(EditText editText, int afterDecimalNum) {
        this.editText = editText;
        this.afterDecimalNum = afterDecimalNum;
    }

//    public DecimalTextWatcher(EditText editText, int afterDecimalNum, OnCommonSingleParamCallback<String> onCommonSingleParamCallback) {
//        this.editText = editText;
//        this.afterDecimalNum = afterDecimalNum;
//        this.onCommonSingleParamCallback = onCommonSingleParamCallback;
//    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        beforeData = s.toString();
        beforeDataArr = null;
        if (!TextUtils.isEmpty(beforeData) && beforeData.contains(".")) {
            beforeDataArr = beforeData.split("\.");
        }
        index = editText.getSelectionStart();
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override
    public void afterTextChanged(Editable s) {
        String afterData = s.toString();

        editText.removeTextChangedListener(this);
        if (afterData.contains(".") && afterData.length() > 1) {
            if (beforeDataArr != null && beforeDataArr.length > 1) {
                for (int i = 0; i < beforeDataArr.length; i++) {
                    if (afterData.contains(beforeDataArr[i])) {
                        String[] afterDataArr = afterData.split("\.");
                        if (afterDataArr != null && afterDataArr.length > 1 && afterDataArr[1].length() > afterDecimalNum) {
                            if (index >= afterDataArr[0].length()) {
                                s.delete(index, index + 1);
                            }
                            break;
                        }
                    }
                }
            }
        }
        editText.addTextChangedListener(this);

//        afterData = s.toString();
//        if (!TextUtils.isEmpty(afterData)) {
//            onCommonSingleParamCallback.onSuccess(afterData);
//        } else {
//            onCommonSingleParamCallback.onError("");
//        }
    }

}

8、在res文件夹的values文件夹的values.xml文件下加入dialog style。

    <style name="dialog_decimal_style"  parent="@android:style/Theme.DeviceDefault.Light.Dialog">
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowNoTitle">true</item>
        <!--设置横屏最少宽度-->
        <item name="android:windowMinWidthMajor">220mm</item>
    </style>

如对此有疑问，请联系qq1164688204。

推荐Android开源项目

项目功能介绍：RxJava2和Retrofit2项目，添加自动管理token功能，添加RxJava2生命周期管理，使用App架构设计是MVP模式和MVVM模式，同时使用组件化，部分代码使用Kotlin，此项目持续维护中。

项目地址：https://gitee.com/urasaki/RxJava2AndRetrofit2

最后

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