Android中自定义IP控件

最近在搞Android项目，之前并没有系统的去学过这方面的编程，只能边看书边撸代码。在项目的开发的过程中，需要一个IP控件，后面了解到Android中并没有这样的控件，于是网上搜索，发现得到的结果并不符合我的需求，于是我根据网上已有的完善了一下这个自定义控件，记录在此，方便下次再用，也希望能给你们留下一点帮助。

一、IP控件布局

IP控件的布局很简单，四个EditText和三个TextView组合而成的，

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="200dp"
    android:layout_gravity="left"
    android:layout_height="30dp"
    android:background="#f2f2f2"
    android:focusable="true"
    android:focusableInTouchMode="true">

    <EditText
        android:id="@+id/Fist_Text"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:layout_gravity="center"
        android:gravity="center"
        android:inputType="numberDecimal"
        android:background="#FFFFFF"
        android:textColor="#4f4f4f"
        android:textCursorDrawable="@drawable/cursor_color"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:gravity="bottom"
        android:textStyle="bold"
        android:text="."
        android:background="#FFFFFF"/>

    <EditText
        android:id="@+id/Second_Text"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:layout_gravity="center"
        android:gravity="center"
        android:inputType="numberDecimal"
        android:background="#FFFFFF"
        android:textColor="#4f4f4f"
        android:textCursorDrawable="@drawable/cursor_color"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:gravity="bottom"
        android:textStyle="bold"
        android:text="."
        android:background="#FFFFFF"/>

    <EditText
        android:id="@+id/Third_Text"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:layout_weight="1"
        android:gravity="center"
        android:inputType="numberDecimal"
        android:background="#FFFFFF"
        android:textColor="#4f4f4f"
        android:textCursorDrawable="@drawable/cursor_color"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:gravity="bottom"
        android:textStyle="bold"
        android:text="."
        android:background="#FFFFFF"/>

    <EditText
        android:id="@+id/Four_Text"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:layout_weight="1"
        android:gravity="center"
        android:inputType="numberDecimal"
        android:background="#FFFFFF"
        android:textColor="#4f4f4f"
        android:textCursorDrawable="@drawable/cursor_color"/>

</LinearLayout>

二、IP逻辑实现

我们平时常用的ip控件的每个文本框内容范围都是0~255，而且当其中一个文本框内容已经是三位数或者输入“.”时，则会自动跳转到下一个文本框中。另外当我们删除文本内容，当文本内容为空时，则会自动跳转到上一个文本框中。所以这是我们实现ip控件需要注意的地方。

下面是具体实现代码

public class IPEditText extends LinearLayout {

    private EditText firIPEdit;
    private EditText secIPEdit;
    private EditText thirIPEdit;
    private EditText fourIPEdit;

    private String firstIP ="";
    private String secondIP="";
    private String thirdIP="";
    private String fourthIP="";

    public IPEditText(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
        View view = LayoutInflater.from(context).inflate(R.layout.ip_text_layout, this);

        firIPEdit = (EditText) findViewById(R.id.Fist_Text);
        secIPEdit = (EditText) findViewById(R.id.Second_Text);
        thirIPEdit = (EditText) findViewById(R.id.Third_Text);
        fourIPEdit = (EditText) findViewById(R.id.Four_Text);

        setIPEditTextListener(context);
    }

    public void setIPEditTextListener(final Context context) {
        //设置第一个IP字段的事件监听
        firIPEdit.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(s.toString().trim().equals(".")){
                    firstIP = "";
                    return;
                }
                if(s.length() > 2 || s.toString().trim().contains(".")){
                    if(s.toString().trim().contains(".")){
                        firstIP = s.toString().trim().substring(0, s.length() - 1);
                    }else {
                        firstIP = s.toString().trim();
                    }
                    if(Integer.parseInt(firstIP) > 255){
                        firstIP = "255";
                    }
                    secIPEdit.setFocusable(true);
                    secIPEdit.requestFocus();

                }else {
                    firstIP = s.toString().trim();
                }
            }

            @Override
            public void afterTextChanged(Editable s) {
                firIPEdit.removeTextChangedListener(this);
                firIPEdit.setText(firstIP);
                firIPEdit.setSelection(firIPEdit.length());
                firIPEdit.addTextChangedListener(this);
            }
        });
        //设置第二个IP字段的事件监听
        secIPEdit.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                //若长度为0，返回到上一个文本编辑框
                if(s.toString().length() == 0){
                    firIPEdit.setFocusable(true);
                    firIPEdit.requestFocus();
                }
                if(s.toString().trim().equals(".")){
                    secondIP = "";
                    return;
                }
                if(s.length() > 2 || s.toString().trim().contains(".")){
                    if(s.toString().trim().contains(".")){
                        secondIP = s.toString().trim().substring(0, s.length() - 1);
                    }else {
                        secondIP = s.toString().trim();
                    }
                    if(Integer.parseInt(secondIP) > 255){
                        secondIP = "255";
                    }
                    thirIPEdit.setFocusable(true);
                    thirIPEdit.requestFocus();
                }else {
                    secondIP = s.toString().trim();
                }
            }

            @Override
            public void afterTextChanged(Editable s) {
                secIPEdit.removeTextChangedListener(this);
                secIPEdit.setText(secondIP);
                secIPEdit.setSelection(secondIP.length());
                secIPEdit.addTextChangedListener(this);
            }
        });

        //设置第三个IP字段的事件监听
        thirIPEdit.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(s.toString().length() == 0){
                    secIPEdit.setFocusable(true);
                    secIPEdit.requestFocus();
                }
                if(s.toString().trim().equals(".")){
                    thirdIP = "";
                    return;
                }
                if(s.length() > 2 || s.toString().trim().contains(".")){
                    if(s.toString().trim().contains(".")){
                        thirdIP = s.toString().trim().substring(0, s.length() - 1);
                    }else {
                        thirdIP = s.toString().trim();
                    }
                    if(Integer.parseInt(thirdIP) > 255){
                        thirdIP = "255";
                    }
                    fourIPEdit.setFocusable(true);
                    fourIPEdit.requestFocus();
                }else {
                    thirdIP = s.toString().trim();
                }
            }

            @Override
            public void afterTextChanged(Editable s) {
                thirIPEdit.removeTextChangedListener(this);
                thirIPEdit.setText(thirdIP);
                thirIPEdit.setSelection(thirdIP.length());
                thirIPEdit.addTextChangedListener(this);
            }
        });

        //设置第四个IP字段的事件监听
        fourIPEdit.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(s.toString().length() == 0){
                    thirIPEdit.setFocusable(true);
                    thirIPEdit.requestFocus();
                }
                if(s.toString().trim().equals(".")){
                    fourthIP = "";
                    return;
                }
                if(s.length() > 2 || s.toString().trim().contains(".")){
                    if(s.toString().trim().contains(".")){
                        fourthIP = s.toString().trim().substring(0, s.length() - 1);
                    }else {
                        fourthIP = s.toString().trim();
                    }
                    if(Integer.parseInt(fourthIP) > 255){
                        fourthIP = "255";
                    }
                }else {
                    fourthIP = s.toString().trim();
                }
            }

            @Override
            public void afterTextChanged(Editable s) {
                fourIPEdit.removeTextChangedListener(this);
                fourIPEdit.setText(fourthIP);
                fourIPEdit.setSelection(fourthIP.length());
                fourIPEdit.addTextChangedListener(this);
            }
        });
    }

    /**
     * 返回整个ip地址
     * @return
     */
    public String getIpText(){
        if(TextUtils.isEmpty(firstIP) || TextUtils.isEmpty(secondIP)
                || TextUtils.isEmpty(thirdIP) || TextUtils.isEmpty(fourthIP)){
            return  null;
        }
        return  firstIP + "." + secondIP + "." + thirdIP + "." + fourthIP;
    }

    /**
     * 本地读取的ip地址显示至界面
     * @param ipText
     */
    public void setIpText(String ipText){
        if(TextUtils.isEmpty(ipText) || ipText == null){
            return;
        }
        String[] temp = null;
        temp = ipText.split("\.");
        if(temp != null){
            firIPEdit.setText(temp[0]);
            secIPEdit.setText(temp[1]);
            thirIPEdit.setText(temp[2]);
            fourIPEdit.setText(temp[3]);
        }
    }
}

三、控件演示

下载源码