java - Going back to Main Activity on Android app with back key to see user score -

hopefully can advice on this.

my program has sprite that, when hit/clicked, score tallied on screen. when game on (time runs out), want user able press key on phone go main/start screen/activity began game, show score (how many hits).

i'm struggling figure out how go back key press. can figure out high score bit @ later date if need be. want start screen.

update:

i think may have manifest why it's not working. i've tried add 'gameview' class manifest won't accept it. says has no default constructor. ideas?

<application     android:allowbackup="true"     android:icon="@drawable/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >     <activity         android:name="cct.mad.lab.mainmenu"         android:label="@string/app_name" >         <intent-filter>             <action android:name="android.intent.action.main" />              <category android:name="android.intent.category.launcher" />         </intent-filter>     </activity>     <activity         android:name=".gameactivity"         android:label="@string/app_name" >      </activity>     <activity         android:name=".gameview"         android:label="@string/app_name" >     </activity> 

my gameview code below:

public class gameview extends surfaceview implements surfaceholder.callback {  /* member (state) fields   */ private gameloopthread gameloopthread; private paint paint; //reference paint object  /** drawable use background of animation canvas */ private bitmap mbackgroundimage; // creating game sprite private sprite sprite; // recording number of hits private int hitcount; // track if game on private boolean gameover; // play sound private soundplayer sound;  //int backbuttoncount = 0;  public gameview(context context) {     super(context);     // focus must on gameview events can handled.     this.setfocusable(true);     // intercepting events on surface.     this.getholder().addcallback(this);     // background image added     mbackgroundimage = bitmapfactory.decoderesource(this.getresources(), r.drawable.half_moon);      //sound = new soundplayer(this);  }  /* called after surface created */ public void surfacecreated(surfaceholder holder) {     // can safely setup game start game loop.     resetgame();//set new game - called 'play again option'     mbackgroundimage = bitmap.createscaledbitmap(mbackgroundimage, getwidth(), getheight(), true);     gameloopthread = new gameloopthread(this.getholder(), this);     gameloopthread.running = true;     gameloopthread.start(); }    // countdown timer private long starttime; // timer count down private final long interval = 1 * 1000; // 1 sec interval private countdowntimer countdowntimer; // reference class private boolean timerrunning = false; private string displaytime; // display time on screen   //to initialise/reset game private void resetgame(){     /* set paint details */     paint = new paint();     paint.setcolor(color.white);      paint.settextsize(20);     sprite = new sprite(this);     hitcount = 0;     // set timer     starttime = 10; // start @ 10s count down     // create new object - convert starttime milliseconds     countdowntimer = new mycountdowntimer(starttime*1000, interval);     countdowntimer.start(); // start time running     timerrunning = true;     gameover = false;   }  // countdown timer - private class private class mycountdowntimer extends countdowntimer {      public mycountdowntimer (long starttime, long interval) {         super(starttime, interval);     }     public void onfinish() {         //displaytime = "time up!";         timerrunning = false;         countdowntimer.cancel();         gameover = true;     }     public void ontick (long millisuntilfinished) {         displaytime = " " + millisuntilfinished / 1000;     } }   //this class updates , manages assets prior drawing - called thread public void update(){      sprite.update();  } /**  * draw game screen  * called thread, synchronisation can done  */ public void dodraw(canvas canvas) {     //draw objects on canvas     canvas.drawbitmap(mbackgroundimage, 0, 0, null);      if (!gameover) {         sprite.draw(canvas);         canvas.drawtext("time remaining: " + displaytime, 35, 50, paint);         canvas.drawtext("number of hits: " + hitcount, 250, 50, paint);     } else         canvas.drawtext("game over!", 185, 100, paint);         canvas.drawtext("to go main menu, press 'back' key", 15, 150, paint);   }  //to used if need find screen touched public boolean ontouchevent(motionevent event) {         if (sprite.wasittouched(event.getx(), event.gety())) {             // renews sprite             sprite = new sprite(this);             //sound.playzapsound();             hitcount++;          }     return true; }  public void surfacedestroyed(surfaceholder holder) {     gameloopthread.running = false;      // shut down game loop thread cleanly.     boolean retry = true;     while(retry) {         try {             gameloopthread.join();             retry = false;         } catch (interruptedexception e) {}     } }  public void gethitcount() {    }  public void surfacechanged(surfaceholder holder, int format, int width, int height) {  }  } 

my mainactivity below:

public class mainmenu extends activity {  private static final int score_request_code = 1;// request code intent  textview tvscore; string score; intent gameintent;  protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.game_start); }  public void startgame(view v){     gameintent = new intent(this,gameactivity.class);     startactivityforresult(gameintent, score_request_code );   } /* create options menu */ public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main_menu, menu);     return true; }  // respond item selected on options menu public boolean onoptionsitemselected(menuitem item) {     // handle item selection     switch (item.getitemid()) {     //put data in intent     case r.id.easy:         toast.maketext(this, "easy chosen", toast.length_short).show();         return true;     case r.id.medium:         toast.maketext(this, "medium chosen", toast.length_short).show();         return true;     case r.id.hard:         toast.maketext(this, "hard chosen", toast.length_short).show();         return true;     case r.id.other:         toast.maketext(this, "other chosen", toast.length_short).show();         return true;     default:         return super.onoptionsitemselected(item);     } }  protected void onactivityresult(int requestcode, int resultcode, intent retintent) {     // check request we're responding     if (requestcode == score_request_code) {         // make sure request successful         if (resultcode == result_ok) {             if (retintent.hasextra("game_score")) {                 int scorefromgame = retintent.getextras().getint("game_score");                 tvscore.settext(integer.tostring(scorefromgame));             }         }        }  }   } 

as always, appreciated.

thanks

use onbackpressed.

@override public void onbackpressed() {     intent i= new intent(your_present_activity.this,the_activity_you_want_to_jump_to.class);     startactivity(i);     finish(); } 

you can take score main.class using newintent.putextra(name,"key");