在libgdx中的android设备上，输入事件不能同时工作

Question

我正在用Libgdx做一个简单的平台游戏。。。我让玩家向左移动，向右移动，然后跳跃。该代码在桌面上运行良好，但在Android设备上，当玩家向左或向右移动时，不会触发跳转。看起来很奇怪。这是我的密码。。。

私有空updatePlayerForUserInput（浮点deltaTime）{

    // check input and apply to velocity & state
    if ((Gdx.input.isKeyPressed(Keys.SPACE) || isTouched(0.87f, 1,0,1f)) && world.player.grounded)
    {
        world.player.velocity.y += world.player.JUMP_VELOCITY;
        world.player.state =2;
        world.player.grounded = false;
    }

    if (Gdx.input.isKeyPressed(Keys.LEFT) || Gdx.input.isKeyPressed(Keys.A) || isTouched(0, 0.1f,0,1f))
    {
        world.player.velocity.x -=world.player.MAX_VELOCITY;
        if (world.player.grounded)
            world.player.state =1;
        world.player.facesRight = false;
    }

    if (Gdx.input.isKeyPressed(Keys.RIGHT) || Gdx.input.isKeyPressed(Keys.D) || isTouched(0.2f, 0.3f,0,1f))
    {
        world.player.velocity.x =world.player.MAX_VELOCITY;
        if (world.player.grounded)
            world.player.state =1;
        world.player.facesRight = true;

    }
}

private boolean isTouched(float startX, float endX , float startY, float endY)
{
    // check if any finge is touch the area between startX and endX
    // startX/endX are given between 0 (left edge of the screen) and 1 (right edge of the screen)
    for (int i = 0; i < 2; i++)
    {
        float x = Gdx.input.getX() / (float) Gdx.graphics.getWidth();
        float y = Gdx.input.getY() / (float) Gdx.graphics.getHeight();
        if (Gdx.input.isTouched(i) && (x >= startX && x <= endX) && (y>=startY && y<= endY))
        {
            return true;
        }
    }
    return false;
}

我从mzencher在

https://github.com/libgdx/libgdx/blob/master/tests/gdx-tests/src/com/badlogic/gdx/tests/superkoalio/SuperKoalio.java

请建议

Answer 1

此代码：

    float x = Gdx.input.getX() / (float) Gdx.graphics.getWidth();
    float y = Gdx.input.getY() / (float) Gdx.graphics.getHeight();

总是从第一次主动触摸中得到x/y。您需要检查"i'th"活动触摸。像这样：

for (int i = 0; i < 20; i++) {
    if (Gdx.input.isTouched(i)) {
      float x = Gdx.input.getX(i) / (float) Gdx.graphics.getWidth();
      float y = Gdx.input.getY(i) / (float) Gdx.graphics.getHeight();
      if ((x >= startX && x <= endX) && (y>=startY && y<= endY)) {
          return true;
      }
}
return false;

此外，您可能应该遍历所有20个可能的触摸点，因为硬件可以跟踪多达20个触摸点。（试着在“跳跃”区域放三个手指，然后在“向左移动”区域添加第四个手指。）