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Android 开发笔记_EditText文本编辑框

常用属性：

inputType：（代码中：setiputtype）设置输入类型，多种类型中间用“|”
maxlength：最大长度，无法通过代码设置
hint：提示文本内容，（代码中：setHint）
textColorHint：提示文本颜色，（代码中：setHintTextColor）

输入类型取值说明：

输入类型	说明
text	文本
textPassword	文本密码，“*”代替
number	整型数
number signed	带符号的数，开头带符号“-”
number decimal	带小数点的数字
number password	数字密码
DATe time	时间日期，允许输入：横线、斜杠、空格、冒号
date	日期格式
time	时间格式

　　在实际开发当中主要有以下四个方面的基本操作：

1、更换编辑框的光标

cursorVisible：指定光标是否可见，（代码中：set cursorvisible）
textcursorDrawable：指定光标的图像，无法在代码里面设置

2、更换编辑框的边框

边框通过background属性设置，隐藏边框的时候，background=@null

1 <?xml version="1.0" encoding="utf-8"?>
2 <selector xmlns:android="http://schemas.android.com/apk/res/android">
3     <item android:state_focused="true" android:drawable="@drawable/shape_edit_focus"/>
4     <item android:drawable="@drawable/shape_edit_normal"/>
5 </selector>

上面代码可以看出，当编辑框获得焦点时，边框就会显示对应的图形shape_edit_focus，否则显示，默认的图形

3、自动隐藏输入法

获取文本最大长度

　　　　由于Edittext没有提供获取最大长度方法，需要用到反射

 1 public static int getMaxLength(EditText et) {
 2         int length = 0;
 3         try {
 4             InputFilter[] inputFilters = et.getFilters();
 5             for (InputFilter filter : inputFilters) {
 6                 Class<?> c = filter.getClass();
 7                 if (c.getName().equals("android.text.InputFilter$LengthFilter")) {
 8                     Field[] f = c.getDeclaredFields();
 9                     for (Field field : f) {
10                         if (field.getName().equals("mMax")) {
11                             field.setAccessible(true);
12                             length = (Integer) field.get(filter);
13                         }
14                     }
15                 }
16             }
17         } catch (Exception e) {
18             e.printStackTrace();
19         }
20         return length;
21     }

监控当前输入的文本长度

　　　　需要实现TextWatcher接口，

 1 private class HideTextWatcher implements TextWatcher {
 2         private EditText mView;
 3         private int mMaxLength;
 4         private CharSequence mStr;
 5 
 6         public HideTextWatcher(EditText v) {
 7             super();
 8             mView = v;
 9             mMaxLength = ViewUtil.getMaxLength(v);
10         }
11 
12         @Override
13         public void beforeTextChanged(CharSequence s, int start, int count, int after) {
14         }
15 
16         @Override
17         public void onTextChanged(CharSequence s, int start, int before, int count) {
18             mStr = s;
19         }
20 
21         @Override
22         public void afterTextChanged(Editable s) {
23             if (mStr == null || mStr.length() == 0)
24                 return;
25             if (mStr.length() == 11 && mMaxLength == 11) {
26                 ViewUtil.hideAllInputMethod(EditHideActivity.this);
27             }
28             if (mStr.length() == 6 && mMaxLength == 6) {
29                 ViewUtil.hideOneInputMethod(EditHideActivity.this, mView);
30             }
31         }
32     }

关闭软键盘

 1 public static void hideAllInputMethod(Activity act) {
 2         InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);  
 3         //软键盘如果已经打开则关闭之
 4         if (imm.isActive() == true) {
 5             imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
 6         }
 7     }
 8 
 9     public static void hideOneInputMethod(Activity act, View v) {
10         InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
11         imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
12     }

隐藏软键盘测试类：

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:id="@+id/ll_hide"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     android:padding="5dp" >
 7 
 8     <View
 9         android:layout_width="match_parent"
10         android:layout_height="20dp" />
11 
12     <EditText
13         android:id="@+id/et_phone"
14         style="@style/text_normal"
15         android:hint="输入11位时自动隐藏输入法"
16         android:inputType="number"
17         android:maxLength="11"
18         android:background="@drawable/editext_selector" />
19 
20     <View
21         android:layout_width="match_parent"
22         android:layout_height="20dp" />
23 
24     <EditText
25         android:id="@+id/et_password"
26         style="@style/text_normal"
27         android:hint="输入6位时自动隐藏输入法"
28         android:inputType="numberPassword"
29         android:maxLength="6"
30         android:background="@drawable/editext_selector" />
31 
32     <View
33         android:layout_width="match_parent"
34         android:layout_height="20dp" />
35 
36     <EditText
37         android:id="@+id/et_other"
38         style="@style/text_normal"
39         android:hint="点击外部空白处隐藏输入法"
40         android:inputType="text"
41         android:background="@drawable/editext_selector" />
42 
43 </LinearLayout>

 1 package com.example.alimjan.hello_world;
 2 
 3 import android.content.Context;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.support.v7.app.AppCompatActivity;
 7 import android.text.Editable;
 8 import android.text.TextWatcher;
 9 import android.view.View;
10 import android.widget.EditText;
11 import android.widget.LinearLayout;
12 
13 import com.example.alimjan.hello_world.Utils.ViewUtil;
14 
15 /**
16  * Created by alimjan on 7/3/2017.
17  */
18 
19 public class class_3_4_1_3 extends AppCompatActivity implements View.OnClickListener {
20 
21     private LinearLayout ll_hide;
22     private EditText et_phone;
23     private EditText et_password;
24     private EditText et_other;
25 
26     @Override
27     protected void onCreate(Bundle savedInstanceState) {
28         super.onCreate(savedInstanceState);
29         setContentView(R.layout.code_3_4_1_3);
30 
31         ll_hide= (LinearLayout) findViewById(R.id.ll_hide);
32         et_phone= (EditText) findViewById(R.id.et_phone);
33         et_password= (EditText) findViewById(R.id.et_password);
34         et_other= (EditText) findViewById(R.id.et_other);
35 
36         ll_hide.setOnClickListener(this);
37         et_phone.addTextChangedListener(new HideTextWatcher(et_phone));
38         et_password.addTextChangedListener(new HideTextWatcher(et_password));
39     }
40 
41     @Override
42     public void onClick(View v) {
43         if (v.getId() == R.id.ll_hide) {
44             //实际上不只是et_other的软键盘会关闭，其它编辑框的软键盘也会关闭
45             //因为方法内部去获取视图的WindowToken，这个Token在每个页面上都是唯一的
46             ViewUtil.hideOneInputMethod(class_3_4_1_3.this, et_other);
47         }
48     }
49 
50     private class HideTextWatcher implements TextWatcher {
51         private EditText mView;
52         private int mMaxLength;
53         private CharSequence mStr;
54 
55         public HideTextWatcher(EditText v) {
56             super();
57             mView = v;
58             mMaxLength = ViewUtil.getMaxLength(v);
59         }
60 
61         @Override
62         public void beforeTextChanged(CharSequence s, int start, int count, int after) {
63         }
64 
65         @Override
66         public void onTextChanged(CharSequence s, int start, int before, int count) {
67             mStr = s;
68         }
69 
70         @Override
71         public void afterTextChanged(Editable s) {
72             if (mStr == null || mStr.length() == 0)
73                 return;
74             if (mStr.length() == 11 && mMaxLength == 11) {
75                 ViewUtil.hideAllInputMethod(class_3_4_1_3.this);
76             }
77             if (mStr.length() == 6 && mMaxLength == 6) {
78                 ViewUtil.hideOneInputMethod(class_3_4_1_3.this, mView);
79             }
80         }
81     }
82 
83     public static void startHome(Context mContext) {
84         Intent intent = new Intent(mContext, class_3_4_1_3.class);
85         mContext.startActivity(intent);
86     }
87 }

4、输入回车符自动跳转

主要是判断输入的内容里面有么有换行符/回车符

 1 private class JumpTextWatcher implements TextWatcher {
 2          
 3         private EditText mThisView = null;
 4         private View mNextView = null;
 5          
 6         public JumpTextWatcher(EditText vThis, View vNext) {
 7             super();
 8             mThisView = vThis;
 9             if (vNext != null) {
10                 mNextView = vNext;
11             }
12         }
13         
14         @Override
15         public void beforeTextChanged(CharSequence s, int start, int count, int after) {
16         }
17 
18         @Override
19         public void onTextChanged(CharSequence s, int start, int before, int count) {
20         }
21 
22         @Override
23         public void afterTextChanged(Editable s) {
24             String str = s.toString();
25             //发现输入回车符或换行符
26             if (str.indexOf("
") >= 0 || str.indexOf("
") >= 0) {
27                 //去掉回车符和换行符
28                 mThisView.setText(str.replace("
", "").replace("
", ""));
29                 if (mNextView != null) {
30                     //让下一个视图获得焦点，即将光标移到下个视图
31                     mNextView.requestFocus();
32                     if (mNextView instanceof EditText) {
33                         EditText et = (EditText)mNextView;
34                         //让光标自动移到编辑框内部的文本末尾
35                         //方式一：直接调用EditText的setSelection方法
36                         et.setSelection(et.getText().length());
37                         //方式二：调用Selection类的setSelection方法
38                         //Editable edit = et.getText();
39                         //Selection.setSelection(edit, edit.length());
40                     }
41                 }
42             }
43         }
44      }

测试：

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent"
 3     android:layout_height="match_parent"
 4     android:orientation="vertical"
 5     android:paddingLeft="20dp"
 6     android:paddingRight="20dp" >
 7 
 8     <View
 9         android:layout_width="match_parent"
10         android:layout_height="20dp" />
11 
12     <EditText
13         android:id="@+id/et_username"
14         style="@style/text_normal"
15         android:hint="请输入用户名"
16         android:inputType="text"
17         android:background="@drawable/editext_selector" />
18 
19     <View
20         android:layout_width="match_parent"
21         android:layout_height="20dp" />
22 
23     <EditText
24         android:id="@+id/et_password"
25         style="@style/text_normal"
26         android:hint="请输入密码"
27         android:inputType="textPassword"
28         android:background="@drawable/editext_selector" />
29 
30     <View
31         android:layout_width="match_parent"
32         android:layout_height="20dp" />
33 
34     <Button
35         android:id="@+id/btn_login"
36         style="@style/btn_relative"
37         android:layout_width="match_parent"
38         android:text="登录" />
39 
40 </LinearLayout>

 1 package com.example.alimjan.hello_world;
 2 
 3 import android.content.Context;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.support.v7.app.AppCompatActivity;
 7 import android.text.Editable;
 8 import android.text.TextWatcher;
 9 import android.view.View;
10 import android.widget.Button;
11 import android.widget.EditText;
12 import android.widget.Toast;
13 
14 /**
15  * Created by alimjan on 7/3/2017.
16  */
17 
18 public class class_3_4_1_4 extends AppCompatActivity implements View.OnClickListener {
19 
20     private EditText et_username;
21     private EditText et_password;
22     private Button btn_login;
23 
24     @Override
25     protected void onCreate(Bundle savedInstanceState) {
26         super.onCreate(savedInstanceState);
27         setContentView(R.layout.code_3_4_1_4);
28 
29         et_username= (EditText) findViewById(R.id.et_username);
30         et_password= (EditText) findViewById(R.id.et_password);
31         btn_login = (Button) findViewById(R.id.btn_login);
32         et_username.addTextChangedListener(new JumpTextWatcher(et_username, et_password));
33         et_password.addTextChangedListener(new JumpTextWatcher(et_password, btn_login));
34         btn_login.setOnClickListener(this);
35     }
36 
37     @Override
38     public void onClick(View v) {
39         if (v.getId() == R.id.btn_login) {
40             Toast.makeText(this, "这个登录按钮啥事也没做", Toast.LENGTH_SHORT).show();
41         }
42     }
43 
44     private class JumpTextWatcher implements TextWatcher {
45 
46         private EditText mThisView = null;
47         private View mNextView = null;
48 
49         public JumpTextWatcher(EditText vThis, View vNext) {
50             super();
51             mThisView = vThis;
52             if (vNext != null) {
53                 mNextView = vNext;
54             }
55         }
56 
57         @Override
58         public void beforeTextChanged(CharSequence s, int start, int count, int after) {
59         }
60 
61         @Override
62         public void onTextChanged(CharSequence s, int start, int before, int count) {
63         }
64 
65         @Override
66         public void afterTextChanged(Editable s) {
67             String str = s.toString();
68             //发现输入回车符或换行符
69             if (str.indexOf("
") >= 0 || str.indexOf("
") >= 0) {
70                 //去掉回车符和换行符
71                 mThisView.setText(str.replace("
", "").replace("
", ""));
72                 if (mNextView != null) {
73                     //让下一个视图获得焦点，即将光标移到下个视图
74                     mNextView.requestFocus();
75                     if (mNextView instanceof EditText) {
76                         EditText et = (EditText)mNextView;
77                         //让光标自动移到编辑框内部的文本末尾
78                         //方式一：直接调用EditText的setSelection方法
79                         et.setSelection(et.getText().length());
80                         //方式二：调用Selection类的setSelection方法
81                         //Editable edit = et.getText();
82                         //Selection.setSelection(edit, edit.length());
83                     }
84                 }
85             }
86         }
87     }
88 
89     public static void startHome(Context mContext) {
90         Intent intent = new Intent(mContext, class_3_4_1_4.class);
91         mContext.startActivity(intent);
92     }
93 
94 }

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原文地址：https://www.cnblogs.com/alimjan/p/7110549.html

Android 开发笔记___EditText__文本编辑框

Android 开发笔记_EditText文本编辑框