Android Use a SWITCH statement with setOnClickListener onClick for more than 1 button

Question

Let s say I have a few buttons in a LinearLayout  2 of them are   mycards button     Button this findViewById R id Button MyCards    exit button     Button this findViewById R id Button Exit      I register setOnClickListener   on both of them   mycards button setOnClickListener this   exit button setOnClickListener this     How do I make a SWITCH to differentiate between the two buttons within the Onclick    public void onClick View v      switch             case                Start a new Activity MyCards java          Intent intent   new Intent this  MyCards class         this startActivity intent         break      case                AlerDialog when click on Exit          MyAlertDialog          break

User · Answer

public class MainActivity extends Activity         implements View OnClickListener       private Button btnForward  btnBackword  btnPause  btnPlay        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           initControl               private void initControl             btnForward    Button  findViewById R id btnForward           btnBackword    Button  findViewById R id btnBackword           btnPause    Button  findViewById R id btnPause           btnPlay    Button  findViewById R id btnPlay           btnForward setOnClickListener this           btnBackword setOnClickListener this           btnPause setOnClickListener this           btnPlay setOnClickListener this               Override     public void onClick View v            switch  v getId                  case R id btnForward                  break              case R id btnBackword                  break              case R id btnPause                  break              case R id btnPlay                  break

User · Answer

For my example  first   MainActivity  implements  View OnClickListener  than start the code        Override  protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main       init       public void init         foryou    Button  this findViewById R id btn foryou       following    Button  findViewById R id btn following       popular    Button  findViewById R id btn popular       watching    Button  findViewById R id btn continuewatching       mProgress    ProgressBar  findViewById R id pb        foryou setOnClickListener this       following setOnClickListener this       popular setOnClickListener this       watching setOnClickListener this       mProgress setOnClickListener this   public void onClick View v        switch  v getId              case R id btn foryou              foryou setPaintFlags foryou getPaintFlags     Paint UNDERLINE TEXT FLAG                break          case R id btn following              following setPaintFlags following getPaintFlags     Paint UNDERLINE TEXT FLAG                break          case R id btn popular              popular setPaintFlags popular getPaintFlags     Paint UNDERLINE TEXT FLAG                break          case R id btn continuewatching              watching setPaintFlags watching getPaintFlags     Paint UNDERLINE TEXT FLAG                break          case R id btn 5                 foryou setPaintFlags foryou getPaintFlags     Paint UNDERLINE TEXT FLAG                break          default              foryou setPaintFlags foryou getPaintFlags     Paint UNDERLINE TEXT FLAG

User · Answer

Another option is to add a new OnClickListener as parameter in setOnClickListener   and overriding the onClick  -method   mycards button     Button this findViewById R id Button MyCards     exit button     Button this findViewById R id Button Exit        Add onClickListener to mycards button mycards button setOnClickListener new OnClickListener         public void onClick View view               Start new activity         Intent intent   new Intent this  MyCards class           this startActivity intent                 Add onClickListener to exit button exit button setOnClickListener new OnClickListener         public void onClick View view               Display alertDialog         MyAlertDialog

User · Answer

Use     public void onClick View v         switch v getId            case R id Button MyCards      Start a new Activity MyCards java            Intent intent   new Intent this  MyCards class           this startActivity intent           break         case R id Button Exit      AlerDialog when click on Exit            MyAlertDialog            break            Note that this will not work in Android library projects  due to http   tools android com tips non-constant-fields  where you will need to use something like   int id   view getId    if  id    R id Button MyCards        action1      else if  id    R id Button Exit        action2

User · Answer

I make it simple  if the layout is same i just put the intent it   My code like this   public class RegistrationMenuActivity extends AppCompatActivity implements View OnClickListener         private Button btnCertificate  btnSeminarKit        Override     protected void onCreate  Nullable Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity registration menu            initClick               private void initClick             btnCertificate    Button  findViewById R id btn Certificate           btnCertificate setOnClickListener this            btnSeminarKit    Button  findViewById R id btn SeminarKit           btnSeminarKit setOnClickListener this               Override     public void onClick View view            switch  view getId                  case R id btn Certificate                  break              case R id btn SeminarKit                  break                    Intent intent   new Intent RegistrationMenuActivity this  ScanQRCodeActivity class           startActivity intent

User · Answer

And there s yet a third option  In your onCreate   method  find all the button views that you have and save them as class data members   You can then cascade a group of if-else statements to find which is which   It s kind of messy  but it s a must if you don t know the ID of the buttons  which can be complicated if you are generating buttons in java code     Override public void onClick View v        if  v    m myCards            Intent intent   new Intent this  MyCards class           this startActivity intent             else if  v    m exit            MyAlertDialog              else if  v    m back            finish                        Another nice thing about this technique is that it s flexible and quick  no having to parse IDs    The bad thing is that you need to keep the widgets in memory   Don t know which method is better

User · Answer

inside OnCreate method  -         Button b    Button findViewById R id button1       b setOnClickListener  View OnClickListener this        b    Button findViewById R id button2       b setOnClickListener  View OnClickListener this        Override public void OnClick View v        switch v getId              case R id button1                 whatever              break            case R id button2                 whatever              break

[android] Android: Use a SWITCH statement with setOnClickListener/onClick for more than 1 button?

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