本文实现了以下功能
- 完整的代码和样例托管在Github
- 当接口锁定时,防止后退按钮显示在登录Activity 上。
- 自定义 ProgressDialog来显示加载的状态。
- 符合材料设计规范。
- 悬浮标签(floating labels)(来自设计支持库)
- 用户表单输入校验
- 自定义状态栏样式
- 在每一个Activity 测试模仿验证的方法。
剩下的就是实现自己的身份验证逻辑。
源码
获取源码地址
登录Activity
如果你想要添加社交登录按钮,请继续,但是当前在这个文章范围内,只给你基本的代码,让你有一个坚固的起点去构建你的验证流程。
需要注意的是 onBackPressed 方法将会被重写,这样将会防止用户关闭登录Activity。
@Overridepublic void onBackPressed() {// Disable going back to the MainActivitymoveTaskToBack(true);}
moveTaskToBack用户在按返回键的时候你并不希望退出(默认就finish了),而是只希望置后台,就可以调这个方法
参考链接
moveTaskToback退后台 - Android探索之路 - 博客频道 - CSDN.NET
LoginActivity
package com.sourcey.materiallogindemo;import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;import butterknife.ButterKnife;
import butterknife.Bind;public class LoginActivity extends AppCompatActivity {private static final String TAG = "LoginActivity";private static final int REQUEST_SIGNUP = 0;@Bind(R.id.input_email) EditText _emailText;@Bind(R.id.input_password) EditText _passwordText;@Bind(R.id.btn_login) Button _loginButton;@Bind(R.id.link_signup) TextView _signupLink;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_login);ButterKnife.bind(this);_loginButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {login();}});_signupLink.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// Start the Signup activityIntent intent = new Intent(getApplicationContext(), SignupActivity.class);startActivityForResult(intent, REQUEST_SIGNUP);}});}public void login() {Log.d(TAG, "Login");if (!validate()) {onLoginFailed();return;}_loginButton.setEnabled(false);final ProgressDialog progressDialog = new ProgressDialog(LoginActivity.this,R.style.AppTheme_Dark_Dialog);progressDialog.setIndeterminate(true);progressDialog.setMessage("Authenticating...");progressDialog.show();String email = _emailText.getText().toString();String password = _passwordText.getText().toString();// TODO: Implement your own authentication logic here.new android.os.Handler().postDelayed(new Runnable() {public void run() {// On complete call either onLoginSuccess or onLoginFailedonLoginSuccess();// onLoginFailed();progressDialog.dismiss();}}, 3000);}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode == REQUEST_SIGNUP) {if (resultCode == RESULT_OK) {// TODO: Implement successful signup logic here// By default we just finish the Activity and log them in automaticallythis.finish();}}}@Overridepublic void onBackPressed() {// Disable going back to the MainActivitymoveTaskToBack(true);}public void onLoginSuccess() {_loginButton.setEnabled(true);finish();}public void onLoginFailed() {Toast.makeText(getBaseContext(), "Login failed", Toast.LENGTH_LONG).show();_loginButton.setEnabled(true);}public boolean validate() {boolean valid = true;String email = _emailText.getText().toString();String password = _passwordText.getText().toString();if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {_emailText.setError("enter a valid email address");valid = false;} else {_emailText.setError(null);}if (password.isEmpty() || password.length() < 4 || password.length() > 10) {_passwordText.setError("between 4 and 10 alphanumeric characters");valid = false;} else {_passwordText.setError(null);}return valid;}
}
res/layout/activity_login.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:fitsSystemWindows="true"><LinearLayout
android:orientation="vertical"android:layout_width="match_parent"android:layout_height="wrap_content"android:paddingTop="56dp"android:paddingLeft="24dp"android:paddingRight="24dp"><ImageView android:src="@drawable/logo"android:layout_width="wrap_content"android:layout_height="72dp"android:layout_marginBottom="24dp"android:layout_gravity="center_horizontal" /><!-- Email Label --><android.support.design.widget.TextInputLayout
android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="8dp"android:layout_marginBottom="8dp"><EditText android:id="@+id/input_email"android:layout_width="match_parent"android:layout_height="wrap_content"android:inputType="textEmailAddress"android:hint="Email" /></android.support.design.widget.TextInputLayout><!-- Password Label --><android.support.design.widget.TextInputLayout
android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="8dp"android:layout_marginBottom="8dp"><EditText android:id="@+id/input_password"android:layout_width="match_parent"android:layout_height="wrap_content"android:inputType="textPassword"android:hint="Password"/></android.support.design.widget.TextInputLayout><android.support.v7.widget.AppCompatButton
android:id="@+id/btn_login"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="24dp"android:layout_marginBottom="24dp"android:padding="12dp"android:text="Login"/><TextView android:id="@+id/link_signup"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginBottom="24dp"android:text="No account yet? Create one"android:gravity="center"android:textSize="16dip"/></LinearLayout>
</ScrollView>
注册Activity
注册Activity 可以让你在App 中创建一个用户,通常会在登录Activity 中显示(注册的)链接。
需要注意的是当用户注册成功时我们会设置一个RESULT_OK 的结果值,这个结果将会在登录Activity 中的 onActivityResult 方法中调用,并且确定注册成功是如何处理的。当前逻辑是很简单的,当用户注册成功时我们会马上做一个记录。当然你想要实现邮箱验证,你需要自己来实现。
SignupActivity.java
package com.sourcey.materiallogindemo;import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;import butterknife.ButterKnife;
import butterknife.Bind;public class SignupActivity extends AppCompatActivity {private static final String TAG = "SignupActivity";@Bind(R.id.input_name) EditText _nameText;@Bind(R.id.input_email) EditText _emailText;@Bind(R.id.input_password) EditText _passwordText;@Bind(R.id.btn_signup) Button _signupButton;@Bind(R.id.link_login) TextView _loginLink;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_signup);ButterKnife.bind(this);_signupButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {signup();}});_loginLink.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// Finish the registration screen and return to the Login activityfinish();}});}public void signup() {Log.d(TAG, "Signup");if (!validate()) {onSignupFailed();return;}_signupButton.setEnabled(false);final ProgressDialog progressDialog = new ProgressDialog(SignupActivity.this,R.style.AppTheme_Dark_Dialog);progressDialog.setIndeterminate(true);progressDialog.setMessage("Creating Account...");progressDialog.show();String name = _nameText.getText().toString();String email = _emailText.getText().toString();String password = _passwordText.getText().toString();// TODO: Implement your own signup logic here.new android.os.Handler().postDelayed(new Runnable() {public void run() {// On complete call either onSignupSuccess or onSignupFailed// depending on successonSignupSuccess();// onSignupFailed();progressDialog.dismiss();}}, 3000);}public void onSignupSuccess() {_signupButton.setEnabled(true);setResult(RESULT_OK, null);finish();}public void onSignupFailed() {Toast.makeText(getBaseContext(), "Login failed", Toast.LENGTH_LONG).show();_signupButton.setEnabled(true);}public boolean validate() {boolean valid = true;String name = _nameText.getText().toString();String email = _emailText.getText().toString();String password = _passwordText.getText().toString();if (name.isEmpty() || name.length() < 3) {_nameText.setError("at least 3 characters");valid = false;} else {_nameText.setError(null);}if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {_emailText.setError("enter a valid email address");valid = false;} else {_emailText.setError(null);}if (password.isEmpty() || password.length() < 4 || password.length() > 10) {_passwordText.setError("between 4 and 10 alphanumeric characters");valid = false;} else {_passwordText.setError(null);}return valid;}
}
res/layout/activity_signup.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:fitsSystemWindows="true"><LinearLayout
android:orientation="vertical"android:layout_width="match_parent"android:layout_height="wrap_content"android:paddingTop="56dp"android:paddingLeft="24dp"android:paddingRight="24dp"><ImageView android:src="@drawable/logo"android:layout_width="wrap_content"android:layout_height="72dp"android:layout_marginBottom="24dp"android:layout_gravity="center_horizontal" /><!-- Name Label --><android.support.design.widget.TextInputLayout
android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="8dp"android:layout_marginBottom="8dp"><EditText android:id="@+id/input_name"android:layout_width="match_parent"android:layout_height="wrap_content"android:inputType="textCapWords"android:hint="Name" /></android.support.design.widget.TextInputLayout><!-- Email Label --><android.support.design.widget.TextInputLayout
android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="8dp"android:layout_marginBottom="8dp"><EditText android:id="@+id/input_email"android:layout_width="match_parent"android:layout_height="wrap_content"android:inputType="textEmailAddress"android:hint="Email" /></android.support.design.widget.TextInputLayout><!-- Password Label --><android.support.design.widget.TextInputLayout
android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="8dp"android:layout_marginBottom="8dp"><EditText android:id="@+id/input_password"android:layout_width="match_parent"android:layout_height="wrap_content"android:inputType="textPassword"android:hint="Password"/></android.support.design.widget.TextInputLayout><!-- Signup Button --><android.support.v7.widget.AppCompatButton
android:id="@+id/btn_signup"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="24dp"android:layout_marginBottom="24dp"android:padding="12dp"android:text="Create Account"/><TextView android:id="@+id/link_login"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginBottom="24dp"android:text="Already a member? Login"android:gravity="center"android:textSize="16dip"/></LinearLayout>
</ScrollView>
配置
为了让程序一切正常工作,我们在需要在 app 目录下的 build.gradle 中添加一些依赖,ButterKnife 是可选的,当然我们更喜欢用它让我们的Java 代码更加整洁一些。
dependencies {compile fileTree(dir: 'libs', include: ['*.jar'])compile 'com.android.support:appcompat-v7:22.2.0'compile 'com.android.support:design:22.2.0'compile 'com.jakewharton:butterknife:7.0.1'
}
本文中使用了ButterKnife
也就是 findViewById(),一直以来的做法都是一个个定义,然后在 setContentView() 或 inflate() 之后一一来findViewById()进行实例化,而使用 ButterKnife,你只需要在代码中 使用注解方式进行对象申明,然后在 setContentView() 或 inflate() 之后调用一句话,那么申明的所有对象自动创建出来。
@Bind(R.id.input_email) EditText _emailText;@Bind(R.id.input_password) EditText _passwordText;@Bind(R.id.btn_login) Button _loginButton;@Bind(R.id.link_signup) TextView _signupLink;ButterKnife.bind(this);
参考链接
推荐一个Android开发懒人库 – ButterKnife - balenofly - 博客园
原文链接
教你写一个炫酷的Material Design 风格的登录和注册页面