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
