Android button onClickListener

Question

I am trying to open new Activity by clicking on a button in my OnClickListener method  How does OnClickListener method work and what should be done in it to start a new Activity

User · Answer

easy   launching activity  onclick handler    Intent myIntent   new Intent CurrentActivity this  NextActivity class    myIntent putExtra  key   value     Optional parameters  CurrentActivity this startActivity myIntent     on the new activity    Override protected void onCreate Bundle savedInstanceState    Intent intent   getIntent    String value   intent getStringExtra  key      if it s a string you stored    and add your new activity in the AndroidManifest xml    lt activity android label   string app name  android name  NextActivity   gt

User · Answer

Use OnClicklistener or you can use android onClick  myMethod  in your button s xml code from which you going to open a new layout  So when that button is clicked your myMethod function will be called automatically  Your myMethod function in class look like this   public void myMethod View v    Intent intent new Intent context SecondActivty class   startActivity intent       And in that SecondActivity class set new layout in contentview

User · Answer

This task can be accomplished using one of the android s main building block named as Intents and One of the methods public void startActivity  Intent intent  which belongs to your Activity class   An intent is an abstract description of an operation to be performed  It can be used with startActivity to launch an Activity  broadcastIntent to send it to any interested BroadcastReceiver components  and startService Intent  or bindService Intent  ServiceConnection  int  to communicate with a background Service   An Intent provides a facility for performing late runtime binding between the code in different applications  Its most significant use is in the launching of activities  where it can be thought of as the glue between activities  It is basically a passive data structure holding an abstract description of an action to be performed   Refer the official docs -- http   developer android com reference android content Intent html  public void startActivity  Intent intent  -- Used to launch a new activity   So suppose you have two Activity class --    PresentActivity -- This is your current activity from which you want to go the second activity  NextActivity -- This is your next Activity on which you want to move    So the Intent would be like this  Intent PresentActivity this  NextActivity class    Finally this will be the complete code  public class PresentActivity extends Activity     protected void onCreate Bundle icicle        super onCreate icicle        setContentView R layout content layout id        final Button button    Button  findViewById R id button id       button setOnClickListener new View OnClickListener                 public void onClick View v                     Perform action on click                  Intent activityChangeIntent   new Intent PresentActivity this  NextActivity class                     currentContext startActivity activityChangeIntent                  PresentActivity this startActivity activityChangeIntent

User · Answer

create a variable that contain your button Button button    Button  findViewById R id button        button setOnClickListener new OnClickListener             Override           On click function         public void onClick View view                  Create the intent to start another activity             Intent intent   new Intent view getContext    AnotherActivity class               startActivity intent

[java] Android button onClickListener

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