TextInputLayout详解

TextInputLayout是什么

TextInputLayout主要是作为EditText的容器，从而为EditText生成一个浮动的Label，当用户点击EditText的时候，EditText中的hint字符串会自动移到EditText的左上角。

TextInputLayout如何使用

●基本用法

xml布局

<?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" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.design.widget.TextInputLayout android:layout_width="match_parent" android:layout_marginTop="20dp" android:layout_height="wrap_content"> <EditText android:layout_width="match_parent" android:hint="请输入用户名" android:layout_height="wrap_content" /> </android.support.design.widget.TextInputLayout> <android.support.design.widget.TextInputLayout android:layout_width="match_parent" android:layout_marginTop="20dp" android:layout_height="wrap_content"> <EditText android:layout_width="match_parent" android:hint="请输入邮箱" android:layout_height="wrap_content" /> </android.support.design.widget.TextInputLayout> </LinearLayout> 

●设置最大字符数及错误提示

xml

<android.support.design.widget.TextInputLayout android:layout_width="match_parent" android:layout_marginTop="20dp" app:counterEnabled="true" //设置为true才能显字符数 app:counterMaxLength="5" //设置最大字符数为5 app:counterOverflowTextAppearance="@style/HintError" //设置超出字符数后提示文字的颜色，如果不设置默认为@color/colorAccent的颜色 android:layout_height="wrap_content"> <EditText android:layout_width="match_parent" android:hint="请输入用户名" android:layout_height="wrap_content" /> </android.support.design.widget.TextInputLayout> 

style文件（设置超出字符数的文字提示颜色为红色）

<style name="HintError" parent="TextAppearance.AppCompat"> <item name="android:textColor">@color/colorRed</item> </style> 

●设置错误提示文字

xml

<android.support.design.widget.TextInputLayout android:layout_width="match_parent" android:layout_marginTop="20dp" app:errorEnabled="true" //设置为true android:id="@+id/textinputlayout_email" android:layout_height="wrap_content"> <EditText android:layout_width="match_parent" android:hint="请输入邮箱" android:id="@+id/et_email" android:layout_height="wrap_content" /> </android.support.design.widget.TextInputLayout> 

java代码

editText_email=findViewById(R.id.et_email); textInputLayout =findViewById(R.id.textinputlayout_email); editText_email.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { if(!RegexUtils.isEmail(charSequence)){ textInputLayout.setError("邮箱格式错误"); textInputLayout.setErrorEnabled(true); }else { textInputLayout.setErrorEnabled(false); } } @Override public void afterTextChanged(Editable editable) { } }); 

●设置密码是否可见

xml

<android.support.design.widget.TextInputLayout android:layout_width="match_parent" android:layout_marginTop="20dp" app:errorEnabled="true" app:passwordToggleEnabled="true" //设置为true android:id="@+id/textinputlayout_password" android:layout_height="wrap_content"> <EditText android:layout_width="match_parent" android:hint="请输入密码" android:id="@+id/et_password" android:inputType="textPassword" android:layout_height="wrap_content" /> </android.support.design.widget.TextInputLayout> 

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