cocos2d-x编译安卓版本时实现“再按一次退出程序”的效果

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转载自:http://blog.csdn.net/somestill/article/details/18046441


我们常见的安卓项目都有再按一次退出程序的提示,或者是要有一个确认框,这样可以避免由于误按导致的程序的退出,所以,当我们通过cocos2d-x制作项目时,也常用到这样的功能,如果通过c++来实现的话,会相对麻烦些,况且不同地方都要设置,相对麻烦,而通过原生的java就可以很好的解决这个问题。

1、我用的cocos2d-x的版本为2.1.5,版本不同,可能具体的解决方法不同,但思路相同。(转载者注: 3.2版本亲测可用)

2、首先找到下图中的这个文件:src目录下的Cocos2dxGLSurfaceView.java文件

找到其中的onKeyDown函数如下:

[java] view plain copy
  1. @Override
  2. publicbooleanonKeyDown(finalintpKeyCode,finalKeyEventpKeyEvent){
  3. switch(pKeyCode){
  4. caseKeyEvent.KEYCODE_BACK:
  5. caseKeyEvent.KEYCODE_MENU:
  6. this.queueEvent(newRunnable(){
  7. voidrun(){
  8. Cocos2dxGLSurfaceView.this.mCocos2dxRenderer.handleKeyDown(pKeyCode);
  9. }
  10. });
  11. returntrue;
  12. default:
  13. super.onKeyDown(pKeyCode,pKeyEvent);
  14. }
  15. }
修改为如下代码

  1. @Override
  2. finalKeyEventpKeyEvent){
  3. switch(pKeyCode){
  4. returnfalse;
  5. caseKeyEvent.KEYCODE_MENU:
  6. newRunnable(){
  7. @Override
  8. voidrun(){
  9. Cocos2dxGLSurfaceView.this.mCocos2dxRenderer.handleKeyDown(pKeyCode);
  10. }
  11. });
  12. true;
  13. default:
  14. }
  15. }
也就是在监听到KEYCODE_BACK时,返回false,而之前返回的是true;
3、找到我们自己设置的安卓的包的标示文件,比如我的是com.planefight.org

打开其中的PlaneFight.java文件,重写onKeyDown方法

系统自动生成的这个文件的原代码

@H_301_274@ /****************************************************************************
  • Copyright(c)2010-2011cocos2d-x.org
  • http://www.cocos2d-x.org
  • Permissionisherebygranted,freeofcharge,toanypersonobtainingacopy
  • ofthissoftwareandassociateddocumentationfiles(the"Software"),todeal
  • intheSoftwarewithoutrestriction,includingwithoutlimitationtherights
  • touse,copy,modify,merge,publish,distribute,sublicense,and/orsell
  • copiesoftheSoftware,andtopermitpersonstowhomtheSoftwareis
  • furnishedtodoso,subjecttothefollowingconditions:
  • Theabovecopyrightnoticeandthispermissionnoticeshallbeincludedin
  • allcopiesorsubstantialportionsoftheSoftware.
  • THESOFTWAREISPROVIDED"ASIS",WITHOUTWARRANTYOFANYKIND,EXPRESSOR
  • IMPLIED,INCLUDINGBUTNOTLIMITEDTOTHEWARRANTIESOFMERCHANTABILITY,
  • FITNESSFORAPARTICULARPURPOSEANDNONINFRINGEMENT.INNOEVENTSHALLTHE
  • AUTHORSORCOPYRIGHTHOLDERSBELIABLEFORANYCLAIM,DAMAGESOROTHER
  • LIABILITY,WHETHERINANACTIONOFCONTRACT,TORTOROTHERWISE,ARISINGFROM,
  • OUTOFORINCONNECTIONWITHTHESOFTWAREORTHEUSEOROTHERDEALINGSIN
  • THESOFTWARE.
  • ****************************************************************************/
  • packagecom.planefight.org;
  • importorg.cocos2dx.lib.Cocos2dxActivity;
  • importorg.cocos2dx.lib.Cocos2dxGLSurfaceView;
  • importandroid.os.Bundle;
  • importandroid.view.KeyEvent;
  • importandroid.widget.Toast;
  • classPlaneFightextendsCocos2dxActivity{
  • protectedvoidonCreate(BundlesavedInstanceState){
  • super.onCreate(savedInstanceState);
  • publicCocos2dxGLSurfaceViewonCreateView(){
  • Cocos2dxGLSurfaceViewglSurfaceView=newCocos2dxGLSurfaceView(this);
  • //PlaneFightshouldcreatestencilbuffer
  • glSurfaceView.setEGLConfigChooser(5,6,0); background-color:inherit">0,0); background-color:inherit">16,0); background-color:inherit">8);
  • returnglSurfaceView;
  • static{
  • System.loadLibrary("cocos2dcpp");
  • }
  • 修改后的代码

    1. /****************************************************************************
    2. Copyright(c)2010-2011cocos2d-x.org
    3. http://www.cocos2d-x.org
    4. Theabovecopyrightnoticeandthispermissionnoticeshallbeincludedin
    5. allcopiesorsubstantialportionsoftheSoftware.
    6. FITNESSFORAPARTICULARPURPOSEANDNONINFRINGEMENT.INNOEVENTSHALLTHE
    7. OUTOFORINCONNECTIONWITHTHESOFTWAREORTHEUSEOROTHERDEALINGSIN
    8. THESOFTWARE.
    9. ****************************************************************************/
    10. packagecom.planefight.org;
    11. importorg.cocos2dx.lib.Cocos2dxActivity;
    12. importorg.cocos2dx.lib.Cocos2dxGLSurfaceView;
    13. importandroid.os.Bundle;
    14. importandroid.view.KeyEvent;
    15. importandroid.widget.Toast;
    16. privatelongexitTime=0;
    17. voidonCreate(BundlesavedInstanceState){
    18. super.onCreate(savedInstanceState);
    19. publicCocos2dxGLSurfaceViewonCreateView(){
    20. this);
    21. //PlaneFightshouldcreatestencilbuffer
    22. 8);
    23. returnglSurfaceView;
    24. @Override
    25. publicbooleanonKeyDown(intkeyCode,KeyEventevent)
    26. {
    27. if(keyCode==KeyEvent.KEYCODE_BACK&&event.getAction()==KeyEvent.ACTION_DOWN)
    28. if((System.currentTimeMillis()-exitTime)>2000)//System.currentTimeMillis()无论何时调用,肯定大于2000
    29. Toast.makeText(getApplicationContext(),"再按一次退出程序",Toast.LENGTH_SHORT).show();
    30. exitTime=System.currentTimeMillis();
    31. }
    32. else
    33. {
    34. finish();
    35. System.exit(0);
    36. }
    37. returntrue;
    38. super.onKeyDown(keyCode,event);
    39. static{
    40. System.loadLibrary("cocos2dcpp");
    41. 也就是添加了重写的onKeyDown函数,并在之前声明了变量exitTime。

      这样,就实现了在安卓应用任何页面按返回键均有提示“再按一次退出程序”;

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