Android应用程序表现得很奇怪

时间：2014-12-29 11:58:02

标签： android

我正在创建一个简单的应用程序，它将从用户获取数据进行注册，然后允许用户登录。

应用程序的默认布局是登录，您可以选择注册或登录。

如果用户已有用户名并尝试登录，则该应用按预期工作，并在验证后打开欢迎页面。

但是，点击注册按钮会打开单元页面，用户可以在此处输入注册详细信息，然后单击注册按钮。

成功后，将创建一个新用户，并将他/她重定向到登录页面。

当我从注册页面重定向到登录页面后尝试登录时出现问题。

我收到以下错误，登录页面自行重新加载。

12-29 17:20:02.327    5823-5823/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: in.techbreeze.android.cake, PID: 5823
    java.lang.IllegalStateException: Could not find a method login(View) in the activity class in.techbreeze.android.cake.Signup for onClick handler on view class android.widget.Button with id 'login_button'
            at android.view.View$1.onClick(View.java:3815)
            at android.view.View.performClick(View.java:4443)
            at android.view.View$PerformClick.run(View.java:18433)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5021)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NoSuchMethodException: login [class android.view.View]
            at java.lang.Class.getConstructorOrMethod(Class.java:472)
            at java.lang.Class.getMethod(Class.java:857)
            at android.view.View$1.onClick(View.java:3808)
            at android.view.View.performClick(View.java:4443)
            at android.view.View$PerformClick.run(View.java:18433)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5021)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
            at dalvik.system.NativeStart.main(Native Method)

如您所见，它正在login文件而不是signup.java文件中搜索onClick处理程序login.java。为什么会这样？

这是login.java文件代码

    package in.techbreeze.android.cake;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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 org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;


public class Login extends ActionBarActivity {

    EditText login_username, login_password;
    String uname, pass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        login_username = (EditText) findViewById(R.id.login_username);
        login_password = (EditText) findViewById(R.id.login_password);

        final Button switchsignup = (Button) findViewById(R.id.signup_button);
        switchsignup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent act2 = new Intent(view.getContext(), Signup.class);
                startActivity(act2);
            }
        });

    }

        public void login(View v) {
                try{

                    // CALL post method to make post method call
                    post();
                }
                catch(Exception ex)
                {
                    String error = ex.getMessage();
                }
            }



    //Method to get list value pair and form the query
    private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;

        for (NameValuePair pair : params) {
            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
        }

        return result.toString();
    }

    //Method to post data to webservice
    public void post() throws UnsupportedEncodingException
    {
        try
        {
            // Calling async task to get json
            new DownloadOperation().execute();

        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    //Handle popout messages
    public void error(boolean flag, String etext) {
        if (flag == true) {
            Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();
            //Code to handle failure
            login_username.setText("");
            login_password.setText("");

        } else {
            Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();
            setContentView(R.layout.activity_welcome);

        }
    }

    //Asynctask
    private class DownloadOperation extends AsyncTask<Void, Void, String> {
        String uname = "";
        String pass = "";
        ProgressDialog dialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Get user defined values
            uname = login_username.getText().toString();
            pass = login_password.getText().toString();

            //Initiate ProgressBar
            dialog = ProgressDialog.show(Login.this, "Please Wait", "Loggin you in ...");
        }

        @Override
        protected String doInBackground(Void... params) {
            String response = "";
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://rgbpallete.in/led/api/login");
            HttpEntity httpEntity = null;
            HttpResponse httpResponse = null;
            try {
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                nameValuePairs.add(new BasicNameValuePair("uname", uname));
                nameValuePairs.add(new BasicNameValuePair("pass", pass));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                httpResponse = httpclient.execute(httppost);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                httpEntity = httpResponse.getEntity();
                response = EntityUtils.toString(httpEntity);
                return response;
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String jsonStr) {
            super.onPostExecute(jsonStr);
            dialog.dismiss();
            Log.d("tag", "Result:\n" + jsonStr);
            if (jsonStr != null) {
                try{
                    JSONObject jsonObj = new JSONObject(jsonStr);
                    String message = jsonObj.getString("message");
                    boolean error = jsonObj.getBoolean("error");

                    error(error,message);

                }
                catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            else {
                Log.e("ServiceHandler", "Couldn't get any data from the url");
            }
        }
    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_login, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
   }

这是signup.java文件代码

package in.techbreeze.android.cake;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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 org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;


public class Signup extends ActionBarActivity {

    EditText signup_username, signup_password, signup_cpassword, signup_email, signup_phone;
    String pass, cpass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_signup);

        signup_username = (EditText) findViewById(R.id.signup_username);
        signup_password = (EditText) findViewById(R.id.signup_password);
        signup_cpassword = (EditText) findViewById(R.id.signup_cpassword);
        signup_email = (EditText) findViewById(R.id.signup_email);
        signup_phone = (EditText) findViewById(R.id.signup_phone);

        final Button switchlogin = (Button) findViewById(R.id.back_button);
        switchlogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent act2 = new Intent(view.getContext(), Login.class);
                startActivity(act2);
            }
        });
    }

    public void signup(View v) {
        try{

            pass = signup_password.getText().toString();
            cpass = signup_cpassword.getText().toString();

            if(pass.equals(cpass))
            {
                // CALL post method to make post method call
                post();
            }
            else
            {
                Toast.makeText(getBaseContext(), "Passwords mismatch", Toast.LENGTH_SHORT).show();
                signup_password.setText("");
                signup_cpassword.setText("");

            }
        }
        catch(Exception ex)
        {
            String error = ex.getMessage();
        }
    }

    //Method to get list value pair and form the query
    private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;

        for (NameValuePair pair : params) {
            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
        }

        return result.toString();
    }

    //Method to post data to webservice
    public void post() throws UnsupportedEncodingException
    {
        try
        {
            // Calling async task to get json
            new DownloadOperation().execute();

        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    //Handle popout messages
    public void error(boolean flag, String etext) {
        if (flag == true) {
            Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();
            //Code to handle failure
            signup_username.setText("");
            signup_password.setText("");
            signup_cpassword.setText("");
            signup_email.setText("");
            signup_phone.setText("");

        } else {
            Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();
            setContentView(R.layout.activity_login);

        }
    }

    //Asynctask
    private class DownloadOperation extends AsyncTask<Void, Void, String> {
        String uname, pass, cpass, email, phone;
        ProgressDialog dialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Get user defined values
            uname = signup_username.getText().toString();
            pass = signup_password.getText().toString();
            cpass = signup_cpassword.getText().toString();
            email = signup_email.getText().toString();
            phone=signup_phone.getText().toString();


            //Initiate ProgressBar
            dialog = ProgressDialog.show(Signup.this, "Please Wait", "Signing you up ...");
        }

        @Override
        protected String doInBackground(Void... params) {
            String response = "";
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://rgbpallete.in/led/api/signup");
            HttpEntity httpEntity = null;
            HttpResponse httpResponse = null;
            try {
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(4);
                nameValuePairs.add(new BasicNameValuePair("uname", uname));
                nameValuePairs.add(new BasicNameValuePair("pass", pass));
                nameValuePairs.add(new BasicNameValuePair("email", email));
                nameValuePairs.add(new BasicNameValuePair("phone", phone));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                httpResponse = httpclient.execute(httppost);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                httpEntity = httpResponse.getEntity();
                response = EntityUtils.toString(httpEntity);
                return response;
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String jsonStr) {
            super.onPostExecute(jsonStr);
            dialog.dismiss();
            Log.d("tag", "Result:\n" + jsonStr);
            if (jsonStr != null) {
                try{
                    JSONObject jsonObj = new JSONObject(jsonStr);
                    String message = jsonObj.getString("message");
                    boolean error = jsonObj.getBoolean("error");

                    error(error,message);

                }
                catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            else {
                Log.e("ServiceHandler", "Couldn't get any data from the url");
            }
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_signup, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

您可以从http://www21.zippyshare.com/v/88368638/file.html

下载项目 P.S：我对这里所述的解决方案表示赞赏，没有任何效果，这是未经修改的版本。

2 个答案:

答案 0 :(得分：1)

首先是将你的函数绑定在xml中的罪犯。

其次，视图（包含登录按钮，即activity_login.xml）似乎正在寻找Signup类中的登录功能。因此，您可以选择从xml函数中删除:onClick并将其绑定到相应的类中...即登录 你应该好好去。

答案 1 :(得分：1)

这是最终解决方案：

activity_login.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" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".Login">

    <TextView android:text="Login to Control Panel" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/login_text"
        android:textSize="20dp"
        android:layout_alignRight="@+id/login_username"
        android:layout_alignEnd="@+id/login_username"
        android:layout_alignLeft="@+id/login_username"
        android:layout_alignStart="@+id/login_username" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Login"
        android:id="@+id/login_button"
        android:layout_alignParentBottom="true"/>

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Signup"
        android:id="@+id/signup_button"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/login_username"
        android:hint="Username"
        android:layout_above="@+id/login_password"
        android:layout_alignLeft="@+id/login_password"
        android:layout_alignStart="@+id/login_password"
        android:layout_toLeftOf="@+id/signup_button"
        android:layout_toStartOf="@+id/signup_button" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/login_password"
        android:hint="Password"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

Login.java 

public class Login extends ActionBarActivity {

    EditText login_username, login_password;
    String uname, pass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        login_username = (EditText) findViewById(R.id.login_username);
        login_password = (EditText) findViewById(R.id.login_password);

        final Button switchsignup = (Button) findViewById(R.id.signup_button);
        switchsignup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent act2 = new Intent(view.getContext(), Signup.class);
                startActivity(act2);
            }
        });

        /*
            - TIP -

            Try always to do as the following instead of call a method into the xml; because you have
            more control of which xml is being called right here
        */
        final Button btLogin = (Button) findViewById(R.id.login_button);
        btLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent act2 = new Intent(view.getContext(), Signup.class);
                startActivity(act2);
            }
        });   


    }

    //Method to get list value pair and form the query
    private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;

        for (NameValuePair pair : params) {
            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
        }

        return result.toString();
    }

    //Method to post data to webservice
    public void post() throws UnsupportedEncodingException
    {
        try
        {
            // Calling async task to get json
            new DownloadOperation().execute();

        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    //Handle popout messages
    public void error(boolean flag, String etext) {
        if (flag == true) {
            Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();
            //Code to handle failure
            login_username.setText("");
            login_password.setText("");

        } else {
            Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();
            setContentView(R.layout.activity_welcome);

        }
    }

    //Asynctask
    private class DownloadOperation extends AsyncTask<Void, Void, String> {
        String uname = "";
        String pass = "";
        ProgressDialog dialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Get user defined values
            uname = login_username.getText().toString();
            pass = login_password.getText().toString();

            //Initiate ProgressBar
            dialog = ProgressDialog.show(Login.this, "Please Wait", "Loggin you in ...");
        }

        @Override
        protected String doInBackground(Void... params) {
            String response = "";
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://rgbpallete.in/led/api/login");
            HttpEntity httpEntity = null;
            HttpResponse httpResponse = null;
            try {
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                nameValuePairs.add(new BasicNameValuePair("uname", uname));
                nameValuePairs.add(new BasicNameValuePair("pass", pass));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                httpResponse = httpclient.execute(httppost);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                httpEntity = httpResponse.getEntity();
                response = EntityUtils.toString(httpEntity);
                return response;
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String jsonStr) {
            super.onPostExecute(jsonStr);
            dialog.dismiss();
            Log.d("tag", "Result:\n" + jsonStr);
            if (jsonStr != null) {
                try{
                    JSONObject jsonObj = new JSONObject(jsonStr);
                    String message = jsonObj.getString("message");
                    boolean error = jsonObj.getBoolean("error");

                    error(error,message);

                }
                catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            else {
                Log.e("ServiceHandler", "Couldn't get any data from the url");
            }
        }
    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_login, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

}

activity_signup.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" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="in.techbreeze.android.cake.Signup">

    <TextView android:text="Enter details to signup" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/signup_text" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Back"
        android:id="@+id/back_button"
        android:layout_marginBottom="71dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginRight="71dp"
        android:layout_marginEnd="71dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/signup_username"
        android:layout_marginTop="92dp"
        android:hint="Username"
        android:layout_below="@+id/signup_text"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignRight="@+id/signup_password"
        android:layout_alignEnd="@+id/signup_password" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/signup_password"
        android:layout_below="@+id/signup_username"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:hint="Password" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/signup_cpassword"
        android:layout_below="@+id/signup_password"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:hint="Confirm Password" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textEmailAddress"
        android:ems="10"
        android:id="@+id/signup_email"
        android:layout_below="@+id/signup_cpassword"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:hint="Email" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="phone"
        android:ems="10"
        android:id="@+id/signup_phone"
        android:layout_below="@+id/signup_email"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:hint="Phone Number" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Singup"
        android:id="@+id/signup_button"
        android:layout_above="@+id/back_button"
        android:layout_alignRight="@+id/back_button"
        android:layout_alignEnd="@+id/back_button"/>

</RelativeLayout>

Signup.java 

public class Signup extends ActionBarActivity {

EditText signup_username, signup_password, signup_cpassword, signup_email, signup_phone;
String pass, cpass;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_signup);

    signup_username = (EditText) findViewById(R.id.signup_username);
    signup_password = (EditText) findViewById(R.id.signup_password);
    signup_cpassword = (EditText) findViewById(R.id.signup_cpassword);
    signup_email = (EditText) findViewById(R.id.signup_email);
    signup_phone = (EditText) findViewById(R.id.signup_phone);

    /*
        - TIP -

        finish(); instead of Intent act2 = new Intent(view.getContext(), Login.class);
            startActivity(act2);

        When you call startActivity you call another activity and don't back to the last activity. For this, you
        have to use finish() instead.

    */
    final Button switchlogin = (Button) findViewById(R.id.back_button);
    switchlogin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            finish();
        }
    });

    /*
        - TIP -

        It's like the Login.java TIP

        Try always to do as the following instead of call a method into the xml; because you have
        more control of which xml is being called right here
    */
    final Button btSignup = (Button) findViewById(R.id.signup_button);
    btSignup.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            try{

                pass = signup_password.getText().toString();
                cpass = signup_cpassword.getText().toString();

                if(pass.equals(cpass))
                {
                    // CALL post method to make post method call
                    post();
                }
                else
                {
                    Toast.makeText(getBaseContext(), "Passwords mismatch", Toast.LENGTH_SHORT).show();
                    signup_password.setText("");
                    signup_cpassword.setText("");

                }
            }
            catch(Exception ex)
            {
                String error = ex.getMessage();
            }
        }
    });
}

//Method to get list value pair and form the query
private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
    StringBuilder result = new StringBuilder();
    boolean first = true;

    for (NameValuePair pair : params) {
        if (first)
            first = false;
        else
            result.append("&");

        result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
        result.append("=");
        result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
    }

    return result.toString();
}

//Method to post data to webservice
public void post() throws UnsupportedEncodingException
{
    try
    {
        // Calling async task to get json
        new DownloadOperation().execute();

    }
    catch (Exception e) {
        e.printStackTrace();
    }
}

//Handle popout messages
public void error(boolean flag, String etext) {
    if (flag == true) {
        Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();
        //Code to handle failure
        signup_username.setText("");
        signup_password.setText("");
        signup_cpassword.setText("");
        signup_email.setText("");
        signup_phone.setText("");

    } else {
        Toast.makeText(getBaseContext(), etext, Toast.LENGTH_SHORT).show();

        /*
            - TIP -

            finish() instead of setContentView(R.layout.activity_login)

            You have to finalize the activity instead of set another content or call startActivity to back.

            You cannot do like you did here(setContentView(R.layout.activity_login)); because doing it you just change the xml and
            not change the activity, so causing the error that you posted
        */
        finish();

    }
}

//Asynctask
private class DownloadOperation extends AsyncTask<Void, Void, String> {
    String uname, pass, cpass, email, phone;
    ProgressDialog dialog;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Get user defined values
        uname = signup_username.getText().toString();
        pass = signup_password.getText().toString();
        cpass = signup_cpassword.getText().toString();
        email = signup_email.getText().toString();
        phone=signup_phone.getText().toString();


        //Initiate ProgressBar
        dialog = ProgressDialog.show(Signup.this, "Please Wait", "Signing you up ...");
    }

    @Override
    protected String doInBackground(Void... params) {
        String response = "";
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://rgbpallete.in/led/api/signup");
        HttpEntity httpEntity = null;
        HttpResponse httpResponse = null;
        try {
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(4);
            nameValuePairs.add(new BasicNameValuePair("uname", uname));
            nameValuePairs.add(new BasicNameValuePair("pass", pass));
            nameValuePairs.add(new BasicNameValuePair("email", email));
            nameValuePairs.add(new BasicNameValuePair("phone", phone));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            httpResponse = httpclient.execute(httppost);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            httpEntity = httpResponse.getEntity();
            response = EntityUtils.toString(httpEntity);
            return response;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String jsonStr) {
        super.onPostExecute(jsonStr);
        dialog.dismiss();
        Log.d("tag", "Result:\n" + jsonStr);
        if (jsonStr != null) {
            try{
                JSONObject jsonObj = new JSONObject(jsonStr);
                String message = jsonObj.getString("message");
                boolean error = jsonObj.getBoolean("error");

                error(error,message);

            }
            catch (JSONException e) {
                e.printStackTrace();
            }
        }
        else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_signup, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

我在代码中添加了一些提示;你可以通过提示找到他们搜索

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