Android之增强文本框(TextInputEditText)

效果图:


xml代码:

activity_text_input_layout.xml

<?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"
    tools:context=".TextInputLayoutActivity"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView50"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名" />

        <EditText
            android:id="@+id/editText18"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName"
            android:text="Name" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView51"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码" />

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:counterMaxLength="10"
            app:counterEnabled="true"
            app:passwordToggleEnabled="true">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/textInputEditText"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="textPassword"
                android:hint="请输入密码" />
        </com.google.android.material.textfield.TextInputLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button37"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="登录" />

        <Button
            android:id="@+id/button38"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="取消" />
    </LinearLayout>
</LinearLayout>

java代码:

TextInputLayoutActivity

package org.wdan.test007;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;

import com.google.android.material.textfield.TextInputEditText;
import com.google.android.material.textfield.TextInputLayout;


public class TextInputLayoutActivity extends AppCompatActivity {
    TextInputLayout textInputLayout;
    TextInputEditText textInputEditText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_text_input_layout);
        textInputLayout=findViewById(R.id.textInputLayout);
        textInputEditText=findViewById(R.id.textInputEditText);
        check();
    }
    //检查密码长度
    public void check(){
        //给增强型文本框设置文本改变事件
        textInputEditText.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) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                //文本改变之后的方法
                if(textInputEditText.getText().toString().length()>10||textInputEditText.getText().toString().length()<6){
                    textInputLayout.setError("密码长度为6~10");
                }else {
                    textInputLayout.setError("");
                }

            }
        });
    }
}