如何在Android中实现TextInputLayout
在进入示例之前,我们应该了解Android中的TextInputLayout是什么。TextInputLayout是由LinearLayout扩展而来。它将充当EditText的包装器,并为EditText显示平滑的提示动画。
此示例演示了如何实现Android TextInputLayout。
步骤1 - 在Android Studio中创建一个新项目,转到文件⇒新建项目,并填写所有必需的详细信息以创建一个新项目。
步骤2 - 将以下代码添加到res/layout/activity_main.xml中。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".MainActivity" android:background = "#dde4dd" android:orientation = "vertical"> <android.support.design.widget.TextInputLayout android:layout_width = "match_parent" android:layout_height = "wrap_content" android:id = "@+id/layoutEmail" android:layout_marginTop = "8dp" android:layout_marginStart = "8dp" android:layout_marginEnd = "8dp" style = "@style/Widget.MaterialComponents.TextInputLayout.FilledBox"> <android.support.design.widget.TextInputEditText android:layout_width = "match_parent" android:layout_height = "wrap_content" android:id = "@+id/email" android:hint = "Enter Email id" android:inputType = "textEmailAddress"/> </android.support.design.widget.TextInputLayout> <android.support.design.widget.TextInputLayout android:layout_width = "match_parent" android:layout_height = "wrap_content" android:id = "@+id/layoutPassword" android:layout_marginTop = "8dp" android:layout_marginStart = "8dp" android:layout_marginEnd = "8dp" style = "@style/Widget.MaterialComponents.TextInputLayout.FilledBox"> <android.support.design.widget.TextInputEditText android:layout_width = "match_parent" android:layout_height = "wrap_content" android:id = "@+id/password" android:hint = "Password" android:inputType = "textPassword"/> </android.support.design.widget.TextInputLayout> <Button android:id = "@+id/click" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_gravity = "center" android:text = "Click"></Button> </LinearLayout>
在上面的代码中,我们给出了两个TextInputEditText和一个按钮。当您点击按钮时,它将获取EditText中的数据并在Toast上显示。
步骤3 - 将以下代码添加到src/MainActivity.java中
package com.example.andy.myapplication;
import android.graphics.Point;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.TextureView;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
EditText email,password;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
email = findViewById(R.id.email);
password = findViewById(R.id.password);
Button click = findViewById(R.id.click);
click.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!email.getText().toString().isEmpty()&&(!password.getText().toString().isEmpty())) {
Toast.makeText(MainActivity.this, "you have entered email id " + email.getText().toString() + "Password " + password.getText().toString(), Toast.LENGTH_LONG).show();
} else {
email.setError("Please Enter Email id");
password.setError("Please Enter Pass word");
}
}
});
}
}步骤4 - 打开build.gradle并添加设计支持库依赖项。
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.andy.myapplication"
minSdkVersion 15
targetSdkVersion 28
compileSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的电脑。要从Android Studio运行应用程序,请打开项目的一个活动文件并点击工具栏中的运行
图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕 -

以上结果是初始屏幕。现在输入一些数据并点击按钮,如下所示 -

现在删除所有EditText数据并点击按钮。它将显示如下结果 -

广告
数据结构
网络
关系数据库管理系统
操作系统
Java
iOS
HTML
CSS
Android
Python
C语言编程
C++
C#
MongoDB
MySQL
Javascript
PHP