Multiple Buttons OnClickListener android

Question

I m currently making a simple calculator app on Android  Im trying to set up the code so that when a number button is pressed it updates the calculator screen with that number  Currently I m doing it like this        Button one    Button  findViewById R id oneButton       one setOnClickListener new View OnClickListener               Override         public void onClick View v                TextView output    TextView  findViewById R id output               output append  1                        It works but I m writing this same code for every single button on the calculator  As you can imagine it is very redundant  Is there anyway I can write this code in a more efficient way  One that involves not writing this method for every single button

User · Answer

You can use this      TextView output    TextView  findViewById R id output       one setOnClickListener youractivity this          set the onclicklistener for other buttons also       Override     public void onClick View v          int id   v getId        switch id        case R id oneButton               append  1  output          break      case R id twoButton          append  2  output          break      case R id threeButton          append  3  output          break                    private void append String s TextView t     t setText s        you can identify the views in your activity in a separate method

User · Answer

I find that using a long if else chain  or switch   in addition to the list of findViewById btn  setOnClickListener this  is ugly  how about creating new View OnlickListeners with override  in-line    findViewById R id signInButton  setOnClickListener new View OnClickListener          Override public void onClick View v    signIn         findViewById R id signOutButton  setOnClickListener new View OnClickListener          Override public void onClick View v    signOut         findViewById R id keyTestButton  setOnClickListener new View OnClickListener          Override public void onClick View v    decryptThisTest         findViewById R id getBkTicksButton  setOnClickListener new View OnClickListener          Override public void onClick View v    getBookTickers         findViewById R id getBalsButton  setOnClickListener new View OnClickListener          Override public void onClick View v    getBalances

User · Answer

You could set the property   android onClick  buttonClicked    in the xml file for each of those buttons  and use this in the java code   public void buttonClicked View view         if  view getId      R id button1               button1 action       else if  view getId      R id button2              button2 action       else if  view getId      R id button3              button3 action

User · Answer

I created dedicated class that implements View OnClickListener   public class ButtonClickListener implements View OnClickListener         Override     public void onClick View v            Toast makeText MainActivity this   Button Clicked   Toast LENGTH SHORT  show               Then  I created an instance of this class in MainActivity  private ButtonClickListener onClickBtnListener   new ButtonClickListener      and then set onClickListener for button  btn setOnClickListener onClickBtnListener

User · Answer

Set a Tag on each button to whatever you want to work with  in this case probably an Integer  Then you need only one OnClickListener for all of your buttons   Button one    Button  findViewById R id oneButton   Button two    Button  findViewById R id twoButton   one setTag new Integer 1    two setTag new Integer 2     OnClickListener onClickListener   new View OnClickListener           Override     public void onClick View v            TextView output    TextView  findViewById R id output           output append v getTag              one setOnClickListener onClickListener   two setOnClickListener onClickListener

User · Answer

public void onClick View v        int id   v getId        switch  id           case R id button1                do ur code             Toast makeText this  This is button 1  Toast LENGTH SHORT  show                break          case R id button2              Intent intent   new Intent this SecondActivity class               Intent putExtra  key  value               startActivity intent               break          case R id button3                do ur code             break          case R id button4                do ur code              break          default                do ur code

User · Answer

No need of if else s or switch  Let s start  In your every Button or whatever it is  I am using ImageView   Add this attribute android onClick  quot DoSomeThing quot  In your Activity  public void DoSomeThing View v       ImageView img1   ImageView  v    you have to cast the view i e  if it s button  it must be cast to Button like below line      Button b1   Button  v       img1 setImageBitmap imageBitmap     or anything you want to do with your view  This will work for all      b1 setText  quot Some Text quot

User · Answer

You Just Simply have to Follow these steps for making it easy    You don t have to write new onClickListener for Every Button    Just Implement View OnClickLister to your Activity Fragment   it will implement new Method called onClick   for handling onClick Events for Button TextView  etc    Implement OnClickListener   in your Activity Fragment   public class MainActivity extends Activity implements View OnClickListener         Implement onClick   method in  your Activity Fragment   public class MainActivity extends Activity implements View OnClickListener             Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState                   Override     public void onClick View v             default method for handling onClick Events              Implement OnClickListener   For Buttons    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState            setContentView R layout your layout            Button one    Button  findViewById R id oneButton       one setOnClickListener this      calling onClick   method     Button two    Button  findViewById R id twoButton       two setOnClickListener this       Button three    Button  findViewById R id threeButton       three setOnClickListener this        Find Buttons By Id and Implement Your Code      Override public void onClick View v        switch  v getId              case R id oneButton                 do your code             break          case R id twoButton                 do your code             break          case R id threeButton                 do your code             break          default              break           Please refer to this link for more information   https   androidacademic blogspot com 2016 12 multiple-buttons-onclicklistener-android html  updated  This will make easier to handle many buttons click events and makes it looks simple to manage it

User · Answer

public class MainActivity extends AppCompatActivity implements OnClickListener        Button  b1 b2       Override     protected void onCreate Bundle savedInstanceState                super onCreate savedInstanceState           setContentView R layout activity main           b1   Button  findViewById R id button           b2   Button  findViewById R id button2           b1 setOnClickListener this           b2 setOnClickListener this                Override     public void onClick View v                if v getId    R id button                        Intent intent new Intent getApplicationContext   SignIn class               startActivity intent                     else if  v getId    R id button2                        Intent in new Intent getApplicationContext   SignUpactivity class               startActivity in

User · Answer

Implement onClick   method in your Activity Fragment public class MainActivity extends Activity implements View OnClickListener         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState               Override     public void onClick View v     switch  itemId        if you call the fragment with nevigation bar then used              case R id nav menu1                  fragment   new IntroductionFragment                    break      if call activity with nevigation bar then used               case R id nav menu6                  Intent i   new Intent MainActivity this  YoutubeActivity class                   startActivity i            default method for handling onClick Events

User · Answer

I had a similar issue and what I did is  Create a array of Buttons  Button buttons     new Button 10     Then to implement on click listener and reference xml id s I used a loop like this  for  int i   0  i  lt  10  i            String buttonID    button    i          int resID   getResources   getIdentifier buttonID   id                    your package name here            buttons i     Button  findViewById resID           buttons i  setOnClickListener this           But calling them up remains same as in Prag s answer point 4  PS- If anybody has a better method to call up all the button s onClick  please do comment

[android] Multiple Buttons' OnClickListener() android

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