How To Start An Activity After My Login Activity

In my login activity...I am asking the username and password.. I want to check whether the user is a authorized user or not.. If the user is authorized then my net activity menu.ja

Solution 1:

Use Aysntask class over here

Which do operation in doInBackground() result and give result in onPostExecute()

publicclassLogin_MenuextendsActivity {


@OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stubsuper.onCreate(savedInstanceState);
    setContentView(R.layout.login_lay);
    final TextView tv=(TextView) findViewById(R.id.login_stat_tv);
    final EditText uname=(EditText)findViewById(R.id.uname);
    final EditText pass=(EditText)findViewById(R.id.pass);
    Button login=(Button)findViewById(R.id.login_but);
    Button cancel=(Button)findViewById(R.id.cancel_but);

    finalHttpClientclient=newDefaultHttpClient();
    String url="http://10.0.2.2:7001/f/json.jsp";
    finalHttpPostpost=newHttpPost(url);
    newlogin().execute("");
 }


privateclassloginextendsAsyncTask<String, Void, Void>{
    ProgressDialogdialog= ProgressDialog.show(activity.this, "", "Loading, Please wait...");

    @OverrideprotectedintdoInBackground(String... params) {
        // TODO Auto-generated method stub
        Log.i("thread", "Doing Something...");
       //authentication operationtry{

        List<NameValuePair> pairs = newArrayList<NameValuePair>();   
        pairs.add(newBasicNameValuePair("username",uname.getText().toString()));   
        pairs.add(newBasicNameValuePair("password",pass.getText().toString()));   
        post.setEntity(newUrlEncodedFormEntity(pairs));   
        HttpResponseresponse= client.execute(post);

        BufferedReaderrd=newBufferedReader(newInputStreamReader(
                response.getEntity().getContent()));
        Stringline=null;

        while ((line = rd.readLine()) != null) {

            tv.append(line);

        }
        //startActivity(new Intent("com.campuspro.start.DEMO_RETRV"));
      }

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

    }

        return val;
    }

    protectedvoidonPreExecute(){
        //dialog.dismiss();
        Log.i("thread", "Started...");
        dialog.show();
    }
    protectedvoidonPostExecute(int result){
        Log.i("thread", "Done...");
        if(dialog!=null)
        dialog.dismiss();
        if(result){
            toast.setText("No User Found, please try again!");
            toast.show();
        }else{
        IntentmyIntent=newIntent(ctx, main.class);
        myIntent.putExtra("user", user);
        startActivity(myIntent);
        }
    }

}

Solution 2:

use Aysntask for making HttpPost on button click.for starting new Activity it's depend on what your servce is returning when user successfully authorized.like

publicvoidonClick(View arg0) {
            try{

                List<NameValuePair> pairs = newArrayList<NameValuePair>();   
                pairs.add(newBasicNameValuePair("username",uname.getText().toString()));   
                pairs.add(newBasicNameValuePair("password",pass.getText().toString()));   
                post.setEntity(newUrlEncodedFormEntity(pairs));   
                HttpResponseresponse= client.execute(post);


                BufferedReaderrd=newBufferedReader(newInputStreamReader(
                        response.getEntity().getContent()));
                Stringline=null;
                String strinfo="";  
                while ((line = rd.readLine()) != null) {

                    tv.append(line);
                    strinfo+=line;

                }
              //check here authorized user or not
               strinfo = strinfo.toLowerCase();
               String strlogin="login=true";
                if((strinfo.contains(strlogin)==true)
                {
                 Intent intent=newIntent(CurrentActivity.this,DEMO_RETRV.this);
                 startActivity(intent);
                //startActivity(new Intent("com.campuspro.start.DEMO_RETRV"));
                }
                else
                {

                }

              }

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

            }


            }

Solution 3:

make http connection in a thread.

and send the response in a UI-Handler

like

//UI-HandlerfinalHandlerhandler=newHandler() 
     { 
          publicvoidhandleMessage(Message msg) 

          { 
                  switch(msg.what){

                   case100:

                      Stringresponse= (String)msg.obj;
                       tv.setText(response);

                  }

               }

          }

//make Http Connection inside  button's onclick and send http response to handleMessage(Message msg) method to update UI

login.setOnClickListener(newView.OnClickListener() {

        publicvoidonClick(View arg0) {

Threadt=newThread()
 {

publicvoidrun()
   {
   try{
        finalHttpClientclient=newDefaultHttpClient();
        String url="http://10.0.2.2:7001/f/json.jsp";
        finalHttpPostpost=newHttpPost(url);

            List<NameValuePair> pairs = newArrayList<NameValuePair>();   
            pairs.add(newBasicNameValuePair("username",uname.getText().toString()));   
            pairs.add(newBasicNameValuePair("password",pass.getText().toString()));   
            post.setEntity(newUrlEncodedFormEntity(pairs));   
            HttpResponseresponse= client.execute(post);
            StringBuffersb=newStringBuffer()

            while ((line = rd.readLine()) != null) {

            sb.append(line);

            }
             //send the response in a UI-HandlerMessagemessage=newMessage();
                  message.obj=sb.toString();
                  message.what=100;

            handler.sendMessage( message );

    }catch(Exception e){}

  }

 }


  t.start();

}

Solution 4:

 package com.campuspro.start;

 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.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 android.app.Activity;
  import android.app.ProgressDialog;
  import android.content.Intent;
  import android.os.AsyncTask;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.View; 
  import android.widget.Button;
   import android.widget.EditText;
  import android.widget.TextView;


publicclassLogin_MenuextendsActivity {

EditText usname;
EditText pass;
TextView tv;
HttpClient client;
HttpPost post;
@OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);
setContentView(R.layout.login_lay);
 tv=(TextView) findViewById(R.id.login_stat_tv);
 usname=(EditText)findViewById(R.id.uname);
 pass=(EditText)findViewById(R.id.pass);
Button login=(Button)findViewById(R.id.login_but);
Button cancel=(Button)findViewById(R.id.cancel_but);

client = newDefaultHttpClient();
String url="http://10.0.2.2:7001/proj/login.jsp";
post = newHttpPost(url);
login.setOnClickListener(newView.OnClickListener() {

    publicvoidonClick(View arg0) {
        // TODO Auto-generated method stubnewlogin().execute("");
    }
});

cancel.setOnClickListener(newView.OnClickListener() {

    publicvoidonClick(View v) {
        // TODO Auto-generated method stub
        usname.getText().clear();
        pass.getText().clear();
    }
});

}



@OverrideprotectedvoidonDestroy() {
// TODO Auto-generated method stubsuper.onDestroy();
}



 @OverrideprotectedvoidonPause() {
// TODO Auto-generated method stubsuper.onPause();
finish();
}

privateclassloginextendsAsyncTask<String, Void, JSONObject>{
ProgressDialog dialog = ProgressDialog.show(Login_Menu.this, "", "Authenticating,   Please wait...");

@OverrideprotectedJSONObjectdoInBackground(String... params) {
    // TODO Auto-generated method stubLog.i("thread", "Doing Something...");
   //authentication operationtry{

    List<NameValuePair> pairs = newArrayList<NameValuePair>();   
    pairs.add(newBasicNameValuePair("username",usname.getText().toString()));   
    pairs.add(newBasicNameValuePair("password",pass.getText().toString()));   
    post.setEntity(newUrlEncodedFormEntity(pairs));   
    HttpResponse response = client.execute(post);
    int status=response.getStatusLine().getStatusCode();

    if(status == 200)
    {
        HttpEntity e=response.getEntity();
        String data=EntityUtils.toString(e);
        JSONObject last=newJSONObject(data);
        return last;

    }

}

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

}

    returnnull;
}

protectedvoidonPreExecute(){
    //dialog.dismiss();Log.i("thread", "Started...");
    dialog.show();
}
protectedvoidonPostExecute(JSONObject result){
    Log.i("thread", "Done...");
    String status;
    String name;
    try {
        status= result.getString("status");
        name=result.getString("uname");

       if(dialog!=null)
       {
         dialog.dismiss();
       }
       if(status.equalsIgnoreCase("yes"))
          {
        tv.setText("Login Successful...");

        Bundle newbundle=newBundle();
        newbundle.putString("uname",name);

        Intent myIntent=newIntent(Login_Menu.this,Instruction.class);
        myIntent.putExtras(newbundle);

        startActivity(myIntent);

    }else{

    tv.setText("No User Found, please try again!");
    }
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}}