Java 解决LibGDX游戏上的随机本机崩溃

我正在工作的一款android游戏的一些用户正在试验一次严重的崩溃，有时会挂断他们的手机。此错误仅在玩家死亡且不在视口中时游戏结束时发生。由于这是一个相当严重的bug，我对代码进行了重构，现在一些用户的问题已经解决了，但不是所有用户

我在Google Play中收到的报告总是与此类似：

Build fingerprint: 'google/hammerhead/hammerhead:4.4.2/KOT49H/937116:user/release-keys'
Revision: '11'
pid: 30442, tid: 30464, name: Thread-458 >>> com.mygdxgame.android <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 78c0b008
r0 78c0b008 r1 42bd8500 r2 00000188 r3 00000008
r4 753669c0 r5 42bd84f8 r6 b0800005 r7 78c0b008
r8 7547db10 r9 7537fd8c sl 75366a48 fp 7547db24
ip 00000000 sp 7547dae8 lr 75347c54 pc 4009e01a cpsr 60010030
d0 4458c000445b4000 d1 7e37e43c3c000000
d2 0000000000000000 d3 0000000000000000
d4 408b780000000000 d5 bf800000c0000000
d6 0000000000000000 d7 3f80000000000000
d8 408b180000000000 d9 408b1c0000000363
d10 0000000000000000 d11 3f80000000000000
d12 00000000000000ff d13 80000000bca3d70a
d14 bf80000080000000 d15 0000000000000000
d16 409f255618c5b67c d17 414e508260000000
d18 3fe45f306dc9c883 d19 4337fffffffffff7
d20 bfdffffffd0c5e81 d21 3fa55553e1053a42
d22 3fefb9659d96e85e d23 3f33872815df26e1
d24 3ef99342e0ee5069 d25 3ed592dfbf0a142d
d26 bfc0c4d52f39a3ad d27 bf62943a05b10df4
d28 3f33872815df26e1 d29 3ec6cd878c3b46a7
d30 bea6acf61c48ffe8 d31 c00921fb54442d18
scr 20000013

backtrace:
#00 pc 0002201a /system/lib/libc.so (__memcpy_base+69)
#01 pc 00037c50 /data/app-lib/com.mygdxgame.android-1/libgdx.so     (Java_com_badlogic_gdx_utils_BufferUtils_copyJni___3FLjava_nio_Buffer_2II+88)
#02 pc 0001dbcc /system/lib/libdvm.so (dvmPlatformInvoke+112)
#03 pc 0004e123 /system/lib/libdvm.so (dvmCallJNIMethod(unsigned int const*, JValue*,     Method const*, Thread*)+398)
#04 pc 00026fe0 /system/lib/libdvm.so
#05 pc 0002dfa0 /system/lib/libdvm.so (dvmMterpStd(Thread*)+76)
#06 pc 0002b638 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*,     JValue*)+184)
#07 pc 00060581 /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*,     bool, JValue*, std::__va_list)+336)
#08 pc 000605a5 /system/lib/libdvm.so (dvmCallMethod(Thread*, Method const*, Object*,     JValue*, ...)+20)
#09 pc 0005528b /system/lib/libdvm.so
#10 pc 0000d170 /system/lib/libc.so (__thread_entry+72)
#11 pc 0000d308 /system/lib/libc.so (pthread_create+240)

code around pc:
4009dff8 f811cb01 f800eb01 f800cb01 ea5feb01 
<lines ommited>

code around lr:
75347c34 e12fff3c e59d101c e59d2018 e1a02102
<lines ommited>

世界控制器

因此，错误发生在onPlayerOutsideViewport调用之间的某个时间，该调用发生在OnPlayerCalling和ScoreScreen的第一次渲染后1或2秒。回调onPlayerOutsideViewport由Box2D ContactListener调用，后者使用另一个类WorldNotifier通知事件，WorldNotifier向所有WorldListener发送通知

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我省略了很多代码，但如果您需要，我可以添加它。任何方法都可以解决这个恼人的错误。

您正在调用一个本机方法，然后该方法使用从传递的对象获得的指针以及作为原始数字传递的偏移量和长度来调用memcpy。其中一个显然是无效的。您可以插入cpp代码或java代码来尝试找出它，也可以尝试通过此框架的作者寻求解决方案。损坏LibGDX使用的一个本机缓冲区的一种方法是过早地将它们处理掉。您可以尝试添加一些检查，这些检查是指您处理的对象未被有效使用且未被重用。

public GameScreen(MyGdxGame game) {
    super(game);

    worldNotifier = new WorldNotifier();

    worldController = new WorldController(game, worldNotifier);
    worldInputProcessor = new WorldInputProcessor(worldNotifier);

    worldNotifier.addListener(worldController);
    worldNotifier.addListener(achievementsUnlocker);
}

@Override
public void render(float delta) {
    if (!paused) {

        /* Update game world */
        worldController.update(delta);
    }

    /* Clear screen */
    Gdx.gl.glClearColor(0, 0, 0, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    /* Render game world */
    worldRenderer.render();
}

@Override
public void resize(int width, int height) {
    worldRenderer.resize(width, height);
}

@Override
public void show() {
    GamePreferences.getInstance().load();

    worldRenderer = new WorldRenderer(worldController);

    /* Initialize controller and renderer */
    worldController.init();
    worldRenderer.init();

    Gdx.input.setCatchBackKey(true);
    Gdx.input.setInputProcessor(new GestureDetector(worldInputProcessor));
}

@Override
public void hide() {
    worldRenderer.dispose();

    Gdx.input.setCatchBackKey(false);
}

public WorldController(MyGdxGame, WorldNotifier worldNotifier) {
    this.game = game;
    this.worldNotifier = worldNotifier;

    rockSpawner = new RockSpawner(this);
    cameraHelper = new CameraHelper();
    cameraHelper.setAxisLocked(false, true);
}

private void showScore() {
    game.scoreScreen.setScore(withstoodTime);
    game.setScreen(game.scoreScreen);
}

public void init() {
    if (world != null) {
        world.dispose();
    }

    world = new World(new Vector2(0, -9.81f), true);

    /* Instantiate game objects */
    <code omited>

    /* Set up controllers, listeners and... your know, all the stuff needed */
    buoyancyController = new BuoyancyController(world, water.sensor);
    buoyancyController.linearDrag = Constants.WATER_DRAG_FORCE;

    world.setContactListener(new WorldContactProcessor(this, worldNotifier));

    rockSpawner.init();
    cameraHelper.setTarget(pirate);

    startTime = TimeUtils.millis();
}

public void update(float delta) {

    /* Update withstood time */
    withstoodTime = TimeUtils.millis() - startTime;

    /* Update game objects */
    <code omited>

    rockSpawner.update(delta);

    buoyancyController.step();
    world.step(1 / 60f, 6, 2);

    cameraHelper.udpate(delta);
}

@Override
public void onPlayerFalling() {
    player.die();
}

@Override
public void onPlayerOutsideViewport() {
    game.googlePlayServicesResolver.submitScore((int) withstoodTime);

    showScore();
}

public ScoreScreen(MyGdxGamegame) {
    super(game);

    font = new BitmapFont();
}

@Override
public void render(float delta) {

    /* Clear screen */
    Gdx.gl.glClearColor(0, 0, 0, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    batch.begin();
    String scoreText = "Your score is: " + score;
    BitmapFont.TextBounds textBounds = font.getBounds(scoreText);
    font.draw(batch, scoreText, (Gdx.graphics.getWidth() - textBounds.width) / 2, Gdx.graphics.getHeight() - 20);
    batch.end();

    if (Gdx.input.isTouched()) {
        game.setScreen(game.gameScreen);
    }
}

@Override
public void show() {
    batch = new SpriteBatch();

    game.googlePlayServicesResolver.showAds(true);
}

@Override
public void hide() {
    batch.dispose();

    game.googlePlayServicesResolver.showAds(false);
}

@Override
public void dispose() {
    font.dispose();
}

public void setScore(long score) {
    this.score = score;
}