注册页面：

user_register.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"android:background="@drawable/bg_01">"<TextView android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="注册"android:textSize="22dip"android:textColor="#FFFFFF"android:paddingLeft="140dip"android:paddingRight="50dip"android:paddingTop="10dip"android:background="@drawable/topbg"/>"<EditText android:id="@+id/register_username"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dip"android:background="@drawable/search" android:layout_marginLeft="20dip"android:layout_marginRight="20dip"android:height="40dip"android:hint="用户名"/><EditText android:id="@+id/register_passwd"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dip"android:background="@drawable/search" android:layout_marginLeft="20dip"android:layout_marginRight="20dip"android:height="40dip"android:hint="密码"/><EditText android:id="@+id/reregister_passwd"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dip"android:background="@drawable/search" android:layout_marginLeft="20dip"android:layout_marginRight="20dip"android:height="40dip"android:hint="确认密码"/><Button android:id="@+id/register_submit"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/topbg"android:height="40dip"android:width="70dip"android:layout_marginTop="60dip"android:text="确定"android:textColor="#FFFFFF"android:textSize="22dip"/></LinearLayout>

处理注册页面的Activity：

package com.example.foreveross.office;import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;import com.example.wenandroid.R;
import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;public class UserRegister extends Activity {private EditText register_username;
private EditText register_passwd;
private EditText reregister_passwd;
private Button register_submit;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();StrictMode.setThreadPolicy(policy);setContentView(R.layout.user_register);register_username=(EditText)findViewById(R.id.register_username);register_passwd=(EditText)findViewById(R.id.register_passwd);reregister_passwd=(EditText)findViewById(R.id.reregister_passwd);register_submit=(Button)findViewById(R.id.register_submit);register_username.setOnFocusChangeListener(new OnFocusChangeListener(){@Overridepublic void onFocusChange(View v, boolean hasFocus) {// TODO Auto-generated method stubif(!hasFocus){if(register_username.getText().toString().trim().length()<4){Toast.makeText(UserRegister.this, "用户名不能小于4个字符", Toast.LENGTH_SHORT).show();}}}});register_passwd.setOnFocusChangeListener(new OnFocusChangeListener(){@Overridepublic void onFocusChange(View v, boolean hasFocus) {// TODO Auto-generated method stubif(!hasFocus){if(register_passwd.getText().toString().trim().length()<6){Toast.makeText(UserRegister.this, "密码不能小于8个字符", Toast.LENGTH_SHORT).show();}}}});reregister_passwd.setOnFocusChangeListener(new OnFocusChangeListener(){@Overridepublic void onFocusChange(View v, boolean hasFocus) {// TODO Auto-generated method stubif(!hasFocus){if(!reregister_passwd.getText().toString().trim().equals(register_passwd.getText().toString().trim())){Toast.makeText(UserRegister.this, "两次密码输入不一致", Toast.LENGTH_SHORT).show(); }}}});register_submit.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v) {if(!checkEdit()){return;}// TODO Auto-generated method stubString httpUrl="http://192.168.1.100:8080/web-test/register.jsp";HttpPost httpRequest=new HttpPost(httpUrl);List<NameValuePair> params=new ArrayList<NameValuePair>();params.add(new BasicNameValuePair("username",register_username.getText().toString().trim()));params.add(new BasicNameValuePair("password",register_passwd.getText().toString().trim()));HttpEntity httpentity = null;try {httpentity = new UrlEncodedFormEntity(params,"utf8");} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}httpRequest.setEntity(httpentity);HttpClient httpclient=new DefaultHttpClient();HttpResponse httpResponse = null;try {httpResponse = httpclient.execute(httpRequest);} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}if(httpResponse.getStatusLine().getStatusCode()==200){String strResult = null;try {strResult = EntityUtils.toString(httpResponse.getEntity());} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}Toast.makeText(UserRegister.this, strResult, Toast.LENGTH_SHORT).show();}else{Toast.makeText(UserRegister.this, "请求错误", Toast.LENGTH_SHORT).show();}}});}private boolean checkEdit(){if(register_username.getText().toString().trim().equals("")){Toast.makeText(UserRegister.this, "用户名不能为空", Toast.LENGTH_SHORT).show();}else if(register_passwd.getText().toString().trim().equals("")){Toast.makeText(UserRegister.this, "密码不能为空", Toast.LENGTH_SHORT).show();}else if(!register_passwd.getText().toString().trim().equals(reregister_passwd.getText().toString().trim())){Toast.makeText(UserRegister.this, "两次密码输入不一致", Toast.LENGTH_SHORT).show();}else{return true;}return false;}}

登录页面xml：

user_login.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" android:background="@drawable/bg_01"><TextView android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="登录"android:textSize="22dip"android:textColor="#FFFFFF"android:paddingLeft="140dip"android:paddingRight="50dip"android:paddingTop="10dip"android:background="@drawable/topbg"/><LinearLayoutandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:orientation="vertical" ><EditTextandroid:id="@+id/login_username"android:layout_width="fill_parent"android:layout_height="40dip"android:layout_marginLeft="20dip"android:layout_marginRight="20dip"android:layout_marginTop="30dip"android:hint="用户名"android:paddingTop="10dip"android:textSize="18dip"android:background="@drawable/search"></EditText><EditTextandroid:id="@+id/login_password"android:layout_width="fill_parent"android:layout_height="40dip"android:layout_marginLeft="20dip"android:layout_marginRight="20dip"android:layout_marginTop="10dip"android:password="true"android:paddingTop="10dip"android:textSize="18dip"android:hint="密码"android:background="@drawable/search"></EditText></LinearLayout><LinearLayoutandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_marginTop="15dip"><CheckBoxandroid:id="@+id/cb1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="50dip"android:layout_marginRight="30dip"android:text="记住密码" android:button="@drawable/checkbox_icon_no" />"<CheckBoxandroid:id="@+id/cb2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="自动登录" android:paddingRight="50dip"android:button="@drawable/checkbox_icon_no"/></LinearLayout><LinearLayoutandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_marginTop="20dip"><Button android:id="@+id/user_login_button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="登录"android:layout_marginLeft="50dip"android:textColor="#F7FBFD"android:background="#FF0000"android:width="70dip"android:height="40dip"android:textSize="18dip"/><Button android:id="@+id/user_register_button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="注册"android:layout_marginLeft="50dip"android:textColor="#F7FBFD"android:width="70dip"android:height="40dip"android:background="#0F9000"android:textSize="18dip"/></LinearLayout></LinearLayout>

登录页面Activity：

package com.example.foreveross.office;import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;import com.example.wenandroid.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;public class UserLogin extends Activity implements OnClickListener {
private EditText login_username;
private EditText login_password;
private Button user_login_button;
private Button user_register_button;@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();StrictMode.setThreadPolicy(policy);setContentView(R.layout.user_login);initWidget();}private void initWidget(){login_username=(EditText)findViewById(R.id.login_username);login_password=(EditText)findViewById(R.id.login_password);user_login_button=(Button)findViewById(R.id.user_login_button);user_register_button=(Button)findViewById(R.id.user_register_button);user_login_button.setOnClickListener(this);user_register_button.setOnClickListener(this);login_username.setOnFocusChangeListener(new OnFocusChangeListener(){@Overridepublic void onFocusChange(View v, boolean hasFocus) {// TODO Auto-generated method stubif(!hasFocus){String username=login_username.getText().toString().trim();if(username.length()<4){Toast.makeText(UserLogin.this, "用户名不能小于4个字符", Toast.LENGTH_SHORT);}}}});login_password.setOnFocusChangeListener(new OnFocusChangeListener(){@Overridepublic void onFocusChange(View v, boolean hasFocus) {// TODO Auto-generated method stubif(!hasFocus){String password=login_password.getText().toString().trim();if(password.length()<4){Toast.makeText(UserLogin.this, "密码不能小于4个字符", Toast.LENGTH_SHORT);}}}});}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch(v.getId()){case R.id.user_login_button:if(checkEdit()){login();}break;case R.id.user_register_button:Intent intent2=new Intent(UserLogin.this,UserRegister.class);startActivity(intent2);break;}}private boolean checkEdit(){if(login_username.getText().toString().trim().equals("")){Toast.makeText(UserLogin.this, "用户名不能为空", Toast.LENGTH_SHORT).show();}else if(login_password.getText().toString().trim().equals("")){Toast.makeText(UserLogin.this, "密码不能为空", Toast.LENGTH_SHORT).show();}else{return true;}return false;}private void login(){String httpUrl="http://192.168.1.102:8080/web-test/login.jsp";HttpPost httpRequest=new HttpPost(httpUrl);List<NameValuePair> params=new ArrayList<NameValuePair>();params.add(new BasicNameValuePair("username",login_username.getText().toString().trim()));params.add(new BasicNameValuePair("password",login_password.getText().toString().trim()));HttpEntity httpentity = null;try {httpentity = new UrlEncodedFormEntity(params,"utf8");} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}httpRequest.setEntity(httpentity);HttpClient httpclient=new DefaultHttpClient();HttpResponse httpResponse = null;try {httpResponse = httpclient.execute(httpRequest);} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}if(httpResponse.getStatusLine().getStatusCode()==200){String strResult = null;try {strResult = EntityUtils.toString(httpResponse.getEntity());} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}Toast.makeText(UserLogin.this, strResult, Toast.LENGTH_SHORT).show();Intent intent=new Intent(UserLogin.this,IndexActivity.class);startActivity(intent);}else{Toast.makeText(UserLogin.this, "登录失败！", Toast.LENGTH_SHORT).show();}}
}

登录成功则跳转到IndexActivity.java

源自：http://www.cnblogs.com/dyllove98/p/3235407.html