how to add button click event in android studio

Question

So I have done some research  and after defining you button as an object by the code  private Button buttonname  buttonname    Button  findViewById R id buttonnameinandroid      here is my problem  buttonname setOnClickListener this     as I understand it  the    this    denotes the current  view focus   in the android program   then your OnClick   event     Problem   When I type in the  this   it says   setOnClickListener  Android View view OnClickListener  in View cannot be applied to  com helloandroidstudio MainActivity    I have no idea why   here is the code from the  java file  import android widget Button  import android widget EditText  import android widget TextView   public class MainActivity extends ActionBarActivity        private Button btnClick      private EditText Name  Date      private TextView msg  NameOut  DateOut       Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main           btnClick    Button  findViewById R id button            btnClick setOnClickListener this           Name    EditText  findViewById R id textenter            Date    EditText  findViewById R id editText            msg    TextView  findViewById R id txtviewOut            NameOut    TextView  findViewById R id txtoutName            DateOut    TextView  findViewById R id txtOutDate            if  savedInstanceState    null                getSupportFragmentManager   beginTransaction                        add R id container  new PlaceholderFragment                         commit                         public void onClick View v                if  v    btnClick                        if  Name equals        false  amp  amp  Date equals        false                                NameOut   Name                  DateOut   Date                  msg setVisibility View VISIBLE                             else                               msg setText  Please complete both fields                    msg setVisibility View VISIBLE                                   return

User · Answer

public class EditProfile extends AppCompatActivity        Button searchBtn      EditText userName editText      EditText password editText      EditText dob editText      RadioGroup genderRadioGroup      RadioButton genderRadioBtn      Button editBtn      Button deleteBtn      Intent intent      DBHandler dbHandler       public static final String USERID EDITPROFILE    userID         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity edit profile            searchBtn    Button findViewById R id editprof searchbtn           userName editText    EditText findViewById R id editprof userName           password editText    EditText findViewById R id editprof password           dob editText    EditText findViewById R id editprof dob           genderRadioGroup    RadioGroup findViewById R id editprof radiogroup           editBtn    Button findViewById R id editprof editbtn           deleteBtn    Button findViewById R id editprof deletebtn           intent   getIntent              dbHandler   new DBHandler EditProfile this            setUserDetails             deleteBtn setOnClickListener new View OnClickListener                  Override             public void onClick View view                    String username   userName editText getText   toString                     if username    null                       Toast makeText EditProfile this  Please enter username to delete your profile  Toast LENGTH SHORT  show                                      else                      UserProfile Users users   dbHandler readAllInfor username                        if users    null                           Toast makeText EditProfile this  No profile found from this username  please enter valid username  Toast LENGTH SHORT  show                                              else                          dbHandler deleteInfo username                           Intent redirectintent home   new Intent  com modelpaper mad it17121002 Home                            startActivity redirectintent home                                                                              editBtn setOnClickListener new View OnClickListener                  Override             public void onClick View view                     String userID String   intent getStringExtra Home USERID                   if userID String    null                       Toast makeText EditProfile this  Error    Toast LENGTH SHORT  show                        Intent redirectintent home    new Intent getApplicationContext   Home class                       startActivity redirectintent home                                     int userID   Integer parseInt userID String                    String username   userName editText getText   toString                    String password   password editText getText   toString                    String dob   dob editText getText   toString                    int selectedGender   genderRadioGroup getCheckedRadioButtonId                    genderRadioBtn    RadioButton findViewById selectedGender                   String gender   genderRadioBtn getText   toString                     UserProfile Users users   UserProfile getProfile   getUser                    users setUsername username                   users setPassword password                   users setDob dob                   users setGender gender                   users setId userID                    dbHandler updateInfor users                   Toast makeText EditProfile this  Updated Successfully  Toast LENGTH SHORT  show                    Intent redirectintent home   new Intent getApplicationContext   Home class                   startActivity redirectintent home                                      searchBtn setOnClickListener new View OnClickListener                  Override             public void onClick View view                   String username   userName editText getText   toString                   if  username    null                      Toast makeText EditProfile this  Please enter a username  Toast LENGTH SHORT  show                                    else                     UserProfile Users users search   dbHandler readAllInfor username                        if users search    null                          Toast makeText EditProfile this  Please enter a valid username  Toast LENGTH SHORT  show                                            else                         userName editText setText users search getUsername                            password editText setText users search getPassword                            dob editText setText users search getDob                            int id   users search getId                           Intent redirectintent   new Intent  com modelpaper mad it17121002 EditProfile                           redirectintent putExtra USERID EDITPROFILE Integer toString id                           startActivity redirectintent                                                                                public void setUserDetails             String userID String   intent getStringExtra Home USERID           if userID String    null               Toast makeText EditProfile this  Error    Toast LENGTH SHORT  show                Intent redirectintent home   new Intent  com modelpaper mad it17121002 Home                startActivity redirectintent home                     int userID   Integer parseInt userID String           UserProfile Users users   dbHandler readAllInfor userID           userName editText setText users getUsername             password editText setText users getPassword             dob editText setText users getDob

User · Answer

When you define an OnClickListener  or any listener  this way  btnClick setOnClickListener this     you need to implement the OnClickListener in your Activity    public class MainActivity extends ActionBarActivity implements OnClickListener

User · Answer

as I understand it  the  this  denotes the current view focus  in the android program   No   this  will only work if your MainActivity referenced by this implements the View OnClickListener  which is the parameter type for the setOnClickListener   method  It means that you should implement View OnClickListener in MainActivity

User · Answer

public class MainActivity extends Activity        Button button        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            button    Button  findViewById R id submitButton           button setOnClickListener new MyClass                 public class MyClass implements View OnClickListener             Override         public void onClick View v

User · Answer

Different ways to handle button event  Button btn1    Button findViewById R id button1   btn1 setOnClickListener new View OnClickListener                          Override         public void onClick View v                   TODO Auto-generated method stub             Toast makeText context   Button 1         Toast LENGTH LONG  show                         Check this article for more details about button event handlers

User · Answer

package com mani smsdetect   import android app Activity  import android os Bundle  import android view View  import android widget Button   public class MainActivity extends Activity implements View OnClickListener          Declaration Button     Button btnClickMe       Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main              Intialization Button          btnClickMe    Button  findViewById R id btnClickMe            btnClickMe setOnClickListener MainActivity this             Here MainActivity this is a Current Class Reference  context              Override     public void onClick View v               Your Logic

User · Answer

public class MainActivity extends AppCompatActivity implements View OnClickListener   Whenever you use  this  on click events  your main activity has to implement ocClickListener  Android Studio does it for you  press alt enter on the  this  word

User · Answer

Button button   Button findViewById R id buttonId   button setOnClickListener new View OnClickListener     Override public void onClick View view           click handling code

User · Answer

You need to do nothing but  just type new View OnClickListener   in your btnClick setOnClickListener    I mean you have to type  btnClick setOnClickListener new View onClickListener the bracket will remain open  just hit enter then a method will be created like this    btnClick setOnClickListener new View OnClickListener              Override         public void onClick View v                         It s just mean that you are creating a new view of OnClickListener and passing a view as it s a parameter  Now you can do whatever u were supposed to do  in that onClick View v  method

User · Answer

Start your OnClickListener  but when you get to the first set up parenthesis  type new  then View  and press enter  Should look like this when you re done   Button btn1    Button findViewById R id button1    btn1 setOnClickListener new View OnClickListener                      Override     public void onClick View v      your stuff here

User · Answer

SetOnClickListener  Android View view OnClickListener  in View cannot   be applied to  com helloandroidstudio MainActivity    This means in other words  due to your current scenario  that your MainActivity need to implement OnClickListener   public class Main extends ActionBarActivity implements View OnClickListener         do your stuff     This   buttonname setOnClickListener this     means that you want to assign listener for your Button  on this instance  - gt  this instance represents OnClickListener and for this reason your class have to implement that interface   It s similar with anonymous listener class  that you can also use    buttonname setOnClickListener new View OnClickListener          Override    public void onClick View view

User · Answer

in Activity java class you would need a method first to find the view of the button as    btnSum   Button findViewById R id button     after this set on click listener   btnSum setOnClickListener new View OnClickListener       and override  onClick method for your functionality  I have found a fully working example here   http   javainhouse blogspot in 2016 01 button-example-android-studio html

User · Answer

Your Activity must implement View OnClickListener  like this    public class MainActivity extends  Activity implements View OnClickListener     YOUR CODE     And inside MainActivity override the method onClick    like this     override public void onClick  View view     here YOUR Action response to Click Button

User · Answer

package com mani helloworldapplication   import android app Activity  import android os Bundle  import android support design widget FloatingActionButton  import android support design widget Snackbar  import android support v7 app AppCompatActivity  import android support v7 widget Toolbar  import android view View  import android view Menu  import android view MenuItem  import android widget Button  import android widget TextView  import android widget Toast   public class MainActivity extends Activity implements View OnClickListener         Declaration     TextView tvName      Button btnShow        Override     protected void onCreate Bundle savedInstanceState               Empty Window         super onCreate savedInstanceState             Load XML File         setContentView R layout activity main              Intilization         tvName    TextView  findViewById R id tvName           btnShow    Button  findViewById R id btnShow            btnShow setOnClickListener this                Override     public void onClick View v                String name   tvName getText   toString            Toast makeText MainActivity this name Toast LENGTH SHORT  show

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