September 6,2016

Today i have worked on the coding of login page activity i.e. the main part.

void showDialog(){
    dia=new ProgressDialog(this);
    dia.setTitle("Loading");
    dia.show();
}
public void loginButton(View v){
     String usrnm=ed_usrnm.getText().toString();
     String pwd=ed_pwd.getText().toString();
     if(valid_pwd() && valid_usrnm()){
         FetchData f=new FetchData();
         f.execute(ed_usrnm.getText().toString(),ed_pwd.getText().toString());
     }

}
public boolean valid_usrnm(){
    if(ed_usrnm.equals(null)){
        ed_usrnm.setError("Enter username!!");
        return false;
    }
    else{
    return true;
    }
}
public boolean valid_pwd(){
    if(ed_pwd.length()==0){
        ed_pwd.setError("Enter Password!! ");
        return false;
    }
    else{
        return true;
    }
}

class FetchData extends AsyncTask<String,Integer,Boolean>{
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        showDialog();
    }

    @Override
    protected Boolean doInBackground(String... params) {
        ArrayList<NameValuePair> list= new ArrayList<>();
        list.add(new BasicNameValuePair("Username",params[0]));
        list.add(new BasicNameValuePair("Password",params[1]));
        try{
            HttpClient client=new DefaultHttpClient();
            HttpPost post=new HttpPost(getString(R.string.path)+"login.php");
            post.setEntity(new UrlEncodedFormEntity(list));
            HttpResponse r=client.execute(post);
            HttpEntity e=r.getEntity();
            InputStream is=e.getContent();
            BufferedReader bf=new BufferedReader(new InputStreamReader(is));
            StringBuilder b=new StringBuilder();
            String line;
            while ((line=bf.readLine())!=null){
                b.append(line);
            }
            String result=b.toString();
            Log.d("result",result);
            JSONObject jsonObject=new JSONObject(result);
            resp=jsonObject.getString("response");
            if(resp.equalsIgnoreCase("ok")) {
                Type = jsonObject.getString("type");
                if (Type.equalsIgnoreCase("Student")) {
                    Name = jsonObject.getString("name");
                    Rollno = jsonObject.getString("roll");
                    Stream=jsonObject.getString("stream");
                   Semester=jsonObject.getString("semester");
                } else {
                    Tchr_name = jsonObject.getString("tch_name");
                    Dept = jsonObject.getString("dept");
                }
                return true;
            }

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

        return false;
    }

    @Override
    protected void onPostExecute(Boolean aBoolean) {
        if(aBoolean==true){
            SharedPreferences sh=getSharedPreferences("preference_ht", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor=sh.edit();
            if(Type.equalsIgnoreCase("Student")){
                editor.putString("name_pref",Name);
                editor.putString("roll_pref",Rollno);
                editor.putString("stream_pref",Stream);
                editor.putString("sem_pref",Semester);
                editor.apply();
                Intent i=new Intent(Login.this,Navigation.class);
                startActivity(i);
            }
            else{
                editor.putString("tch_name_pref",Tchr_name);
                editor.putString("dept_pref",Dept);
                editor.apply();
                Intent i=new Intent(Login.this,TchrNav.class);
                startActivity(i);
            }
        }

        super.onPostExecute(aBoolean);
    }
}