我有2个文件：
MainActivity.java
public class MainActivity extends BaseGameActivity implements
IOnMenuItemClickListener {
/*
* Constants for frame
*/
private static final int CAMERA_WIDTH = 480;
private static final int CAMERA_HEIGHT = 320;
protected static final int MENU_ABOUT = 0;
protected static final int MENU_QUIT = MENU_ABOUT + 1;
protected static final int MENU_PLAY = 100;
protected static final int MENU_SCORES = MENU_PLAY + 1;
protected static final int MENU_OPTIONS = MENU_SCORES + 1;
protected static final int MENU_HELP = MENU_OPTIONS + 1;
/*
* Fields
*/
private Camera mCamera;
private Scene mMainScene;
// Save Image for Menu
private BitmapTextureAtlas mMenuBackTexture;
private TextureRegion mMenuBackTextureRegion;
private BitmapTextureAtlas mPopUpTexture;
// private BitmapTextureAtlas mFontTexture;
protected Font mFont;
protected TextureRegion mPopUpAboutTextureRegion;
protected TextureRegion mPopUpQuitTextureRegion;
protected TextureRegion mMenuPlayTextureRegion;
protected TextureRegion mMenuScoresTextureRegion;
protected TextureRegion mMenuOptionsTextureRegion;
protected TextureRegion mMenuHelpTextureRegion;
private boolean popupDisplayed;
protected MenuScene mStaticMenuScene, mPopUpMenuScene;
/*
* Constructors
*/
/*
* Getter and Setter
*/
public Camera getmCamera() {
return mCamera;
}
public void setmCamera(Camera mCamera) {
this.mCamera = mCamera;
}
/*
* Methods for SuperClass/Interface
*/
@Override
public Engine onLoadEngine() {
// TODO Auto-generated method stub
// this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
this.setmCamera(new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT));
return new Engine(new EngineOptions(true, ScreenOrientation.LANDSCAPE,
new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT),
this.getmCamera()));
}
@Override
public void onLoadResources() {
// TODO Auto-generated method stub
// this.mTexture = new BitmapTextureAtlas(512, 512,
// TextureOptions.BILINEAR_PREMULTIPLYALPHA);
// this.mSplashTextureRegion = BitmapTextureAtlasTextureRegionFactory
// .createFromAsset(this.mTexture, this, "gfx/Splashscreen.png",
// 0, 0);
// this.mEngine.getTextureManager().loadTexture(this.mTexture);
// Process and load Font Menu
final ITexture mFontTexture = new BitmapTextureAtlas(256, 256,
TextureOptions.BILINEAR_PREMULTIPLYALPHA);
FontFactory.setAssetBasePath("font/");
this.mFont = FontFactory.createFromAsset(mFontTexture, this,
"Vera.ttf", 32, true, Color.RED);
this.mFont.reload();
this.mEngine.getTextureManager().loadTexture(mFontTexture);
this.mEngine.getFontManager().loadFont(this.mFont);
// Process image background
this.mMenuBackTexture = new BitmapTextureAtlas(512, 512,
TextureOptions.BILINEAR_PREMULTIPLYALPHA);
this.mMenuBackTextureRegion = BitmapTextureAtlasTextureRegionFactory
.createFromAsset(this.mMenuBackTexture, this,
"gfx/MainMenu/MainMenuBk.png", 0, 0);
this.mEngine.getTextureManager().loadTexture(this.mMenuBackTexture);
// Process image PopUp
this.mPopUpTexture = new BitmapTextureAtlas(512, 512,
TextureOptions.BILINEAR_PREMULTIPLYALPHA);
this.mPopUpAboutTextureRegion = BitmapTextureAtlasTextureRegionFactory
.createFromAsset(this.mPopUpTexture, this,
"gfx/MainMenu/About_button.png", 0, 0);
this.mPopUpAboutTextureRegion = BitmapTextureAtlasTextureRegionFactory
.createFromAsset(this.mPopUpTexture, this,
"gfx/MainMenu/Quit_button.png", 0, 50);
this.mEngine.getTextureManager().loadTexture(this.mPopUpTexture);
popupDisplayed = false;
}
@Override
public Scene onLoadScene() {
this.mEngine.registerUpdateHandler(new FPSLogger());
// final Scene scene = new Scene();
this.createStaticMenuScene();
this.createPopUpMenuScene();
/* Center the splash on the camera. */
final int centerX = (CAMERA_WIDTH - this.mMenuBackTextureRegion
.getWidth()) / 2;
final int centerY = (CAMERA_HEIGHT - this.mMenuBackTextureRegion
.getHeight()) / 2;
this.mMainScene = new Scene();
/* Create the sprite and add it to the scene. */
final Sprite menuBack = new Sprite(centerX, centerY,
this.mMenuBackTextureRegion);
mMainScene.attachChild(menuBack);
return mMainScene;
}
@Override
public void onLoadComplete() {
// TODO Auto-generated method stub
}
@Override
public boolean onKeyDown(int pKeyCode, KeyEvent pEvent) {
if (pKeyCode == KeyEvent.KEYCODE_MENU
&& pEvent.getAction() == KeyEvent.ACTION_DOWN) {
if (popupDisplayed) {
// Remove the menu and reset it.
this.mPopUpMenuScene.back();
mMainScene.setChildScene(mStaticMenuScene);
popupDisplayed = false;
} else {
this.mMainScene.setChildScene(mPopUpMenuScene, false, true,
true);
popupDisplayed = true;
}
return true;
} else {
return super.onKeyDown(pKeyCode, pEvent);
}
}
@Override
public boolean onMenuItemClicked(MenuScene pMenuScene, IMenuItem pMenuItem,
float pMenuItemLocalX, float pMenuItemLocalY) {
switch (pMenuItem.getID()) {
case MENU_ABOUT:
Toast.makeText(MainActivity.this, "About selected",
Toast.LENGTH_SHORT).show();
return true;
case MENU_QUIT:
this.finish();
return true;
case MENU_PLAY:
Toast.makeText(MainActivity.this, "Play selected",
Toast.LENGTH_SHORT).show();
return true;
case MENU_SCORES:
Toast.makeText(MainActivity.this, "Scores selected",
Toast.LENGTH_SHORT).show();
return true;
case MENU_OPTIONS:
Toast.makeText(MainActivity.this, "Options selected",
Toast.LENGTH_SHORT).show();
return true;
case MENU_HELP:
Toast.makeText(MainActivity.this, "Help selected",
Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
/*
* Methods for this class
*/
protected void createStaticMenuScene() {
// put camera to menu
this.mStaticMenuScene = new MenuScene(this.mCamera);
// Add Play game
final IMenuItem playMenuItem = new ColorMenuItemDecorator(
new TextMenuItem(MENU_PLAY, mFont, "Play Game"), 0.5f, 0.5f,
0.5f, 0.0f, 0.0f, 0.0f);
playMenuItem.setBlendFunction(GL10.GL_SRC_ALPHA,
GL10.GL_ONE_MINUS_SRC_ALPHA);
this.mStaticMenuScene.addMenuItem(playMenuItem);
// Add Scores
final IMenuItem scoresMenuItem = new ColorMenuItemDecorator(
new TextMenuItem(MENU_SCORES, mFont, "Scores"), 0.5f, 0.5f,
0.5f, 0.0f, 0.0f, 0.0f);
scoresMenuItem.setBlendFunction(GL10.GL_SRC_ALPHA,
GL10.GL_ONE_MINUS_SRC_ALPHA);
this.mStaticMenuScene.addMenuItem(scoresMenuItem);
// Add Options
final IMenuItem optionsMenuItem = new ColorMenuItemDecorator(
new TextMenuItem(MENU_OPTIONS, mFont, "Options"), 0.5f, 0.5f,
0.5f, 0.0f, 0.0f, 0.0f);
optionsMenuItem.setBlendFunction(GL10.GL_SRC_ALPHA,
GL10.GL_ONE_MINUS_SRC_ALPHA);
this.mStaticMenuScene.addMenuItem(optionsMenuItem);
// Add Help
final IMenuItem helpMenuItem = new ColorMenuItemDecorator(
new TextMenuItem(MENU_HELP, mFont, "Help"), 0.5f, 0.5f, 0.5f,
0.0f, 0.0f, 0.0f);
helpMenuItem.setBlendFunction(GL10.GL_SRC_ALPHA,
GL10.GL_ONE_MINUS_SRC_ALPHA);
this.mStaticMenuScene.addMenuItem(helpMenuItem);
// build camera
this.mStaticMenuScene.buildAnimations();
this.mStaticMenuScene.setBackgroundEnabled(false);
this.mStaticMenuScene.setOnMenuItemClickListener(this);
}
protected void createPopUpMenuScene() {
this.mPopUpMenuScene = new MenuScene(this.mCamera);
//add about popup
final SpriteMenuItem aboutMenuItem = new SpriteMenuItem(MENU_ABOUT,
this.mPopUpAboutTextureRegion);
aboutMenuItem.setBlendFunction(GL10.GL_SRC_ALPHA,
GL10.GL_ONE_MINUS_SRC_ALPHA);
this.mPopUpMenuScene.addMenuItem(aboutMenuItem);
//add quit popup
SpriteMenuItem quitMenuItem = new SpriteMenuItem(MENU_QUIT,
this.mPopUpQuitTextureRegion);
quitMenuItem.setBlendFunction(GL10.GL_SRC_ALPHA,
GL10.GL_ONE_MINUS_SRC_ALPHA);
this.mPopUpMenuScene.addMenuItem(quitMenuItem);
//build camera
this.mPopUpMenuScene.setMenuAnimator(new SlideMenuAnimator());
this.mPopUpMenuScene.buildAnimations();
this.mPopUpMenuScene.setBackgroundEnabled(false);
this.mPopUpMenuScene.setOnMenuItemClickListener(this);
}
}
StartActivity.java
public class StartActivity extends BaseGameActivity {
/*
* Constants
*/
private static final int CAMERA_WIDTH = 480;
private static final int CAMERA_HEIGHT = 320;
/*
* Fields
*/
private Camera mCamera;
private BitmapTextureAtlas mBitmapTextureAtlas;
private TextureRegion mTextureRegion;
private Handler mHandler;
/*
* Constructors
*/
/*
* Getter and Setter
*/
/*
* Method for/from SuperClass/Interfaces
*/
@Override
public Engine onLoadEngine() {
mHandler = new Handler();
// put camera
this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
return new Engine(new EngineOptions(true, ScreenOrientation.LANDSCAPE,
new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT),
this.mCamera));
}
@Override
public void onLoadResources() {
this.mBitmapTextureAtlas = new BitmapTextureAtlas(512, 512,
TextureOptions.BILINEAR_PREMULTIPLYALPHA);
this.mTextureRegion = BitmapTextureAtlasTextureRegionFactory
.createFromAsset(this.mBitmapTextureAtlas, this, "gfx/Splashscreen.png", 0, 0);
this.mEngine.getTextureManager().loadTexture(this.mBitmapTextureAtlas);
}
@Override
public Scene onLoadScene() {
this.mEngine.registerUpdateHandler(new FPSLogger());
final Scene scene = new Scene();
/* Center the splash on the camera. */
final int centerX = (CAMERA_WIDTH - this.mTextureRegion
.getWidth()) / 2;
final int centerY = (CAMERA_HEIGHT - this.mTextureRegion
.getHeight()) / 2;
final Sprite slash = new Sprite(centerX, centerY,
this.mTextureRegion);
scene.attachChild(slash);
return scene;
}
@Override
public void onLoadComplete() {
mHandler.postDelayed(mLauchTask, 3000);
}
/*
* Methods
*/
/*
* Inner and Anonymous Classes
*/
private Runnable mLauchTask = new Runnable() {
public void run() {
Intent myIntent = new Intent(StartActivity.this, MainActivity.class);
StartActivity.this.startActivity(myIntent);
}
};
}
我在logcat中看到
05-29 18：44：50.338：W / dalvikvm（1049）：threadid = 1：线程退出，未捕获异常（group = 0x4001d800） 05-29 18：44：50.358：E / AndroidRuntime（1049）：致命异常：主要 05-29 18：44：50.358：E / AndroidRuntime（1049）：java.lang.NullPointerException 05-29 18：44：50.358：E / AndroidRuntime（1049）：at org.anddev.andengine.entity.sprite.Sprite。（Sprite.java:27） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at org.anddev.andengine.entity.scene.menu.item.SpriteMenuItem。（SpriteMenuItem.java:29） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at com.khoado.v3.MainActivity.createPopUpMenuScene（MainActivity.java:285） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at com.khoado.v3.MainActivity.onLoadScene（MainActivity.java:154） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at org.anddev.andengine.ui.activity.BaseGameActivity.doResume（BaseGameActivity.java:169） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at org.anddev.andengine.ui.activity.BaseGameActivity.onWindowFocusChanged（BaseGameActivity.java:85） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at com.android.internal.policy.impl.PhoneWindow $ DecorView.onWindowFocusChanged（PhoneWindow.java:1981） 05-29 18：44：50.358：E / AndroidRuntime（1049）：在android.view.View.dispatchWindowFocusChanged（View.java:3788） 05-29 18：44：50.358：E / AndroidRuntime（1049）：在android.view.ViewGroup.dispatchWindowFocusChanged（ViewGroup.java:658） 05-29 18：44：50.358：E / AndroidRuntime（1049）：在android.view.ViewRoot.handleMessage（ViewRoot.java:1921） 05-29 18：44：50.358：E / AndroidRuntime（1049）：在android.os.Handler.dispatchMessage（Handler.java:99） 05-29 18：44：50.358：E / AndroidRuntime（1049）：在android.os.Looper.loop（Looper.java:123） 05-29 18：44：50.358：E / AndroidRuntime（1049）：在android.app.ActivityThread.main（ActivityThread.java:4627） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at java.lang.reflect.Method.invokeNative（Native Method） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at java.lang.reflect.Method.invoke（Method.java:521） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:868） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:626） 05-29 18：44：50.358：E / AndroidRuntime（1049）：at dalvik.system.NativeStart.main（Native Method）
为什么会出错？
答案 0 :(得分：0)
您的createPopUpMenuScene方法中已获得Null Pointer Exception。生成此异常的行号是285.无论如何，因为我无法确定您发布的第285行，所以我无法给出明确而直截了当的答案。
在我看来，通过调试应用程序来逐步调试代码行，可以轻松解决这些问题。