当我在桌面模拟器上运行应用程序时，它运行正常，但是如果我打开我的移动设备，当我按下主菜单上的播放按钮时它会崩溃。在桌面设备上，它会更改为播放屏幕。
我知道它在某个地方是空的，但我找不到它。如果我删除
hud = new Hud(game.batch);
我桌面模拟器上也是黑屏。
戏剧类：
public class PlayScreen implements Screen {
private RunningGame game;
private TextureAtlas atlas;
private OrthographicCamera gamecam;
private Viewport gamePort;
private Hud hud;
private TmxMapLoader maploader;
private TiledMap map;
private OrthogonalTiledMapRenderer renderer;
private World world;
private Box2DDebugRenderer b2dr;
private Runner player;
private float dt;
private boolean keyPressed = false;
private Button speedButton;
public PlayScreen(RunningGame game){
atlas = new TextureAtlas("Runner_And_Enemies.pack");
this.game = game;
gamecam = new OrthographicCamera();
gamePort = new FitViewport(RunningGame.V_WIDTH / RunningGame.PPM, RunningGame.V_HEIGHT / RunningGame.PPM, gamecam);
hud = new Hud(game.batch);
maploader = new TmxMapLoader();
map = maploader.load("level1.tmx");
renderer = new OrthogonalTiledMapRenderer(map, 1 / RunningGame.PPM);
gamecam.position.set(gamePort.getWorldWidth() / 2, gamePort.getWorldHeight() / 2 ,0);
world = new World(new Vector2(0, -10), true);
b2dr = new Box2DDebugRenderer();
new B2WorldCreator(world, map);
player = new Runner(world, this);
}
public TextureAtlas getAtlas(){
return atlas;
}
@Override
public void show() {
}
public void handleInput(float dt){
if (Gdx.input.isKeyPressed(Input.Keys.RIGHT)) {
if (!keyPressed) {
keyPressed = true;
if (player.b2body.getLinearVelocity().x <= 4) {
player.b2body.applyLinearImpulse(new Vector2(0.3f, 0), player.b2body.getWorldCenter(), true);
}
Hud.addscore(1);
}
} else {
keyPressed = false;
}
if (Gdx.input.isKeyPressed(Input.Keys.UP))
player.b2body.applyLinearImpulse(new Vector2(0, 0.4f), player.b2body.getWorldCenter(), true);
if (Gdx.input.isKeyPressed(Input.Keys.LEFT) && player.b2body.getLinearVelocity().x >= -2)
player.b2body.applyLinearImpulse(new Vector2(-5.2f, 0), player.b2body.getWorldCenter(), true);
}
public void update(float dt){
handleInput(dt);
world.step(1 / 60f, 6, 2);
player.update(dt);
gamecam.position.x = player.b2body.getPosition().x;
gamecam.update();
renderer.setView(gamecam);
}
@Override
public void render(float delta) {
update(delta);
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
renderer.render();
b2dr.render(world, gamecam.combined);
game.batch.setProjectionMatrix(gamecam.combined);
game.batch.begin();
player.draw(game.batch);
game.batch.end();
game.batch.setProjectionMatrix(hud.stage.getCamera().combined);
hud.stage.draw();
}
@Override
public void resize(int width, int height) {
gamePort.update(width, height);
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void hide() {
}
@Override
public void dispose() {
map.dispose();
renderer.dispose();
world.dispose();
b2dr.dispose();
hud.dispose();
}
}
正在运行游戏类：
import com.badlogic.gdx.Game;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.mygdx.game.Screens.PlayScreen;
import com.mygdx.game.Screens.SplashScreen;
import aurelienribon.tweenengine.TweenManager;
public class RunningGame extends Game {
public static final int V_WIDTH = 400;
public static final int V_HEIGHT = 208;
public static final float PPM = 100;
public static final String TITLE = "Running Game", VERSION = "0.0.0.0.reallyEarly";
public SpriteBatch batch;
private TweenManager tweenManager;
@Override
public void create () {
batch = new SpriteBatch();
tweenManager = new TweenManager();
setScreen(new SplashScreen(this));
}
@Override
public void dispose() {
super.dispose();
}
@Override
public void render() {
super.render();
}
@Override
public void resize(int width, int height) {
}
@Override
public void pause(){
}
@Override
public void resume(){
}
}
错误日志：
FATAL EXCEPTION: GLThread 26852
Process: com.mygdx.game, PID: 17739
java.lang.NullPointerException: Attempt to read from field 'com.badlogic.gdx.graphics.g2d.SpriteBatch com.mygdx.game.RunningGame.batch' on a null object reference
at com.mygdx.game.Screens.PlayScreen.<init>(PlayScreen.java:55)
at com.mygdx.game.Screens.MainMenu$1$1.run(MainMenu.java:86)
at com.badlogic.gdx.scenes.scene2d.actions.RunnableAction.run(RunnableAction.java:42)
at com.badlogic.gdx.scenes.scene2d.actions.RunnableAction.act(RunnableAction.java:32)
at com.badlogic.gdx.scenes.scene2d.actions.SequenceAction.act(SequenceAction.java:65)
at com.badlogic.gdx.scenes.scene2d.Actor.act(Actor.java:95)
at com.badlogic.gdx.scenes.scene2d.Group.act(Group.java:46)
at com.badlogic.gdx.scenes.scene2d.Stage.act(Stage.java:222)
at com.mygdx.game.Screens.MainMenu.render(MainMenu.java:47)
at com.badlogic.gdx.Game.render(Game.java:46)
at com.mygdx.game.RunningGame.render(RunningGame.java:36)
at com.badlogic.gdx.backends.android.AndroidGraphics.onDrawFrame(AndroidGraphics.java:472)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1561)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1278)
02-22 18:36:51.388 17739-17739/com.mygdx.game E/AndroidGraphics: waiting for pause synchronization took too long; assuming deadlock and killing
02-22 18:36:51.388 17739-17739/com.mygdx.game I/Process: Sending signal. PID: 17739 SIG: 9