Kevin Learn Android：TextInputLay

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前言

官网：TextInputLayout

01.png

引入 material 包：

implementation 'com.google.android.material:material:1.2.1'

属性

属性	含义
counterEnabled	字符计数是否可用
counterMaxLength	计数最大的长度
counterOverflowTextAppearance	计数超过最大长度时显示的文本样式
counterTextAppearance	显示的计数的文本样式
errorEnabled	显示错误信息是否可用
errorTextAppearance	显示错误信息的文本样式
hint	浮动标签
hintEnabled	控制是否显示浮动标签
hintTextAppearance	浮动标签的文本样式
passwordToggleDrawable	密码可见切换图标
passwordToggleEnabled	控制是否显示密码可见切换图标

使用

1. 带浮动标签的文本框

   
   002.gif

布局文件

<?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=".MainActivity">

    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        app:counterOverflowTextAppearance="@style/TextOverCount"
        android:scrollbarAlwaysDrawHorizontalTrack="true"
        android:textColorHint="@color/black">

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="用户名"
            android:background="@color/white"
            android:inputType="text"
            android:textColor="@color/black"/>

    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        app:counterOverflowTextAppearance="@style/TextOverCount"
        android:scrollbarAlwaysDrawHorizontalTrack="true"
        android:textColorHint="@color/black">

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/white"
            android:hint="手机号码"
            android:inputType="number"
            android:textColor="@color/black"/>

    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.button.MaterialButton
        android:id="@+id/materialButton"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="登录"
        android:textAllCaps="false" />

</LinearLayout>

2. 带字符计数的文本框

   
   002.jpg

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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/text_input_layout_user"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        android:textColorHint="@color/black">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/text_input_user"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="用户名"
            android:background="@color/white"
            android:inputType="text"
            android:textColor="@color/black"/>

    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        app:counterOverflowTextAppearance="@style/TextOverCount"
        android:scrollbarAlwaysDrawHorizontalTrack="true"
        android:textColorHint="@color/black">

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/white"
            android:hint="手机号码"
            android:inputType="number"
            android:textColor="@color/black"/>

    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.button.MaterialButton
        android:id="@+id/materialButton"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="登录"
        android:textAllCaps="false" />

</LinearLayout>

在 Activity 中设置，计数的长度：

public class MainActivity extends BaseActivity {

    @BindView(R.id.text_input_layout_user)
    TextInputLayout mTextInputLayout;



    @Override
    public int getLayoutId() {
        return R.layout.activity_main;
    }

    @Override
    public void initView() {
        // 设置可以计数
        mTextInputLayout.setCounterEnabled(true);
        // 计数的最大值
        mTextInputLayout.setCounterMaxLength(10);
    }

}

3. 显示密码可见和隐藏的切换按钮

   
   03.jpg

布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">


    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/til_name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:counterEnabled="true"
        app:counterMaxLength="3"
        app:counterOverflowTextAppearance="@style/MyOverflowText"
        app:errorEnabled="true"
        app:errorTextAppearance="@style/MyErrorText"
        app:hintTextAppearance="@style/MyHintText"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:ignore="MissingConstraints">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/et_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="0dp"
            android:background="@color/white"
            android:hint="用户名"
            android:paddingStart="0dp"
            android:textSize="18sp" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/til_password"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/til_name"
        app:passwordToggleEnabled="true"
        app:passwordToggleTint="@color/green_deep_color">

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/white"
            android:hint="密码"
            android:inputType="textPassword"
            android:paddingStart="0dp" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.button.MaterialButton
        android:id="@+id/btn_login"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="8dp"
        android:text="登录"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/til_password" />

</androidx.constraintlayout.widget.ConstraintLayout>

在 Activity 中设置：

public class MainActivity extends BaseActivity {
    @BindView(R.id.til_name)
    TextInputLayout mLayoutName;

    @BindView(R.id.et_name)
    TextInputEditText mName;

    @BindView(R.id.btn_login)
    MaterialButton mLogin;

    @Override
    public int getLayoutId() {
        return R.layout.activity_main;
    }

    @Override
    public void initView() {
        mName.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) {
                mLayoutName.setErrorEnabled(false);
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });


        mLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = mName.getText().toString().trim();
                if (name.length() > mLayoutName.getCounterMaxLength()) {
                    mLayoutName.setError("输入内容超过上限");
                }
            }
        });

    }

}

style 风格

    <style name="MyHintText" parent="TextAppearance.AppCompat.Small">
        <item name="android:textColor">@color/light_grey_color</item>
    </style>

    <style name="MyEditText" parent="Theme.AppCompat.Light">
        <item name="colorControlNormal">@color/light_grey_color</item>
        <item name="colorControlActivated">@color/black</item>
        <item name="android:textSize">18sp</item>
    </style>

    <style name="MyErrorText" parent="TextAppearance.AppCompat.Small">
        <item name="android:textColor">@color/red_deep</item>
    </style>

    <!--Overflow label text style-->
    <style name="MyOverflowText" parent="TextAppearance.AppCompat.Small">
        <item name="android:textColor">@color/orange</item>
    </style>