剩下的就是实现自己的身份验证逻辑。
获取源码地址
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。
@Override
public void onBackPressed() {
// Disable going back to the MainActivity
moveTaskToBack(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
moveTaskToback退后台 - Android探索之路 - 博客频道 - CSDN.NET
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;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
ButterKnife.bind(this);
_loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
login();
}
});
_signupLink.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Start the Signup activity
Intent 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 onLoginFailed
onLoginSuccess();
// onLoginFailed();
progressDialog.dismiss();
}
}, 3000);
}
@Override
protected 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 automatically
this.finish();
}
}
}
@Override
public void onBackPressed() {
// Disable going back to the MainActivity
moveTaskToBack(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;
}
}
<?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 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。
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;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
ButterKnife.bind(this);
_signupButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
signup();
}
});
_loginLink.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Finish the registration screen and return to the Login activity
finish();
}
});
}
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 success
onSignupSuccess();
// 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;
}
}
<?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>
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'
}
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);
推荐一个Android开发懒人库 – ButterKnife - balenofly - 博客园
教你写一个炫酷的Material Design 风格的登录和注册页面