Android实战简易教程-第二十三枪（基于Baas的用户注冊和登录模块实现！）

接着上两篇文章。我们基于Bmob提供的API实现用户登录功能。总体看一下代码。

1.注冊页面xml:

<RelativeLayout 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" >

    <TableLayout
        android:id="@+id/tl"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TableRow>

            <TextView
                android:id="@+id/tv_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="用户名：" />

            <EditText
                android:id="@+id/et_username"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="5"
                
                android:text="" />
        </TableRow>

        <TableRow>

            <TextView
                android:id="@+id/tv_password"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="密码：" />

            <EditText
                android:id="@+id/et_password"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="5"
                android:text="" />
        </TableRow>
    </TableLayout>

    <Button
        android:id="@+id/register"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tl"
        android:onClick="submit"
        android:text="注冊" />

</RelativeLayout>

2.注冊页面.java:

package com.example.logintest;

import java.util.List;

import org.w3c.dom.UserDataHandler;

import cn.bmob.v3.Bmob;
import cn.bmob.v3.BmobQuery;
import cn.bmob.v3.listener.FindListener;
import cn.bmob.v3.listener.SaveListener;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
	private EditText mUserName, mPassword;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Bmob.initialize(this, "8f3ffb2658d8a3366a70a0b0ca0b71b2");
		mUserName = (EditText) findViewById(R.id.et_username);
		mPassword = (EditText) findViewById(R.id.et_password);
	}

	public void submit(View view) {
		final String username = mUserName.getText().toString();
		final String password = mPassword.getText().toString();
		if (username.equals("") || password.equals("")) {
			Toast.makeText(this, "用户名或密码不能为空！
", 3).show();
		} else {
			BmobQuery<User> query = new BmobQuery<User>();// 查询类
			query.addWhereEqualTo("userName", username);// 查询条件
			query.findObjects(MainActivity.this, new FindListener<User>() {

				@Override
				public void onSuccess(List<User> userlist) {
					if (userlist.size() == 0) {// 查询不到，用户名可用
						User user = new User();
						user.setUserName(username);
						user.setUserPassword(password);
						user.save(MainActivity.this, new SaveListener() {

							@Override
							public void onSuccess() {
								Toast.makeText(MainActivity.this,
										"注冊成功！跳转到登录页面。", 3).show();
								Intent intent = new Intent();
								intent.setClass(MainActivity.this, Login.class);
								intent.putExtra("username", username);
								startActivity(intent);

							}

							@Override
							public void onFailure(int arg0, String arg1) {
								Toast.makeText(MainActivity.this, "注冊失败。", 3)
										.show();
							}
						});
					} else {
						Toast.makeText(MainActivity.this, "用户名已被注冊！
", 3).show();
					}

				}

				@Override
				public void onError(int arg0, String arg1) {
					// TODO Auto-generated method stub

				}
			});

		}

	}

}

3.登录界面.xml：

<RelativeLayout 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" >

    <TableLayout
        android:id="@+id/tllayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TableRow>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="用户名：" />

            <EditText
                android:id="@+id/et_usernamelogin"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="5"
                
                android:text="" />
        </TableRow>

        <TableRow>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="密码：" />

            <EditText
                android:id="@+id/et_passwordlogin"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:password="true"
                android:layout_weight="5"
                android:text="" />
        </TableRow>
    </TableLayout>

    <Button
        android:id="@+id/login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tllayout"
        android:text="登录" />

</RelativeLayout>

4.登录界面.java:

package com.example.logintest;

import java.util.List;

import cn.bmob.v3.Bmob;
import cn.bmob.v3.BmobQuery;
import cn.bmob.v3.listener.FindListener;
import cn.bmob.v3.listener.SaveListener;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class Login extends Activity {
	private EditText mLoginName, mLoginPassword;
	private Button mButtonLogin;
	private String username, password;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.login);
		Bmob.initialize(this, "8f3ffb2658d8a3366a70a0b0ca0b71b2");// 初始化Bmob
		mLoginName = (EditText) findViewById(R.id.et_usernamelogin);
		mLoginPassword = (EditText) findViewById(R.id.et_passwordlogin);
		mButtonLogin = (Button) findViewById(R.id.login);
		Intent intent = getIntent();
		username = intent.getStringExtra("username");
		mLoginName.setText(username);
		mButtonLogin.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				final String username = mLoginName.getText().toString();
				final String password = mLoginPassword.getText().toString();
				if (username.equals("") || password.equals("")) {
					Toast.makeText(Login.this, "用户名或密码不能为空！", 3).show();
				} else {
					BmobQuery<User> query = new BmobQuery<User>();// 查询类
					query.addWhereEqualTo("userName", username);// 查询条件
					query.findObjects(Login.this, new FindListener<User>() {

						@Override
						public void onSuccess(List<User> userlist) {
							if (userlist == null) {// 查询不到。用户名可用

								Toast.makeText(Login.this, "用户名错误！
", 3).show();

							} else {

								if (userlist.get(0).getUserPassword()
										.equals(password)) {
									Toast.makeText(Login.this, "登录成功。", 3)
											.show();
									Intent intent = new Intent();
									intent.setClass(Login.this, Success.class);
									startActivity(intent);
								} else {
									Toast.makeText(Login.this, "密码错误！", 3)
											.show();
								}

							}

						}

						@Override
						public void onError(int arg0, String arg1) {
							// TODO Auto-generated method stub

						}
					});

				}
			}

		});

	}
}

5.登录成功.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登录成功！
"/>
    

</LinearLayout>

6.登录成功.java:

package com.example.logintest;

import android.app.Activity;
import android.os.Bundle;

public class Success extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.success);
	}

}

7.javabean.java:

package com.example.logintest;

import cn.bmob.v3.BmobObject;

public class User extends BmobObject {
	private String userPassword;
	public String getUserPassword() {
		return userPassword;
	}
	public void setUserPassword(String userPassword) {
		this.userPassword = userPassword;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	private String userName;
}

8.配置文件：

<?
xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.logintest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_LOGS" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.logintest.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.example.logintest.Login" >
        </activity>
        <activity android:name="com.example.logintest.Success" >
        </activity>
    </application>

</manifest>

9.文件截图：

10.执行截图：

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