Question

我一直收到此错误

12-26 13:00:47.564: E/GameScene(21593): Error intializing sensors
12-26 13:00:47.564: E/GameScene(21593): java.lang.NullPointerException
12-26 13:00:47.564: E/GameScene(21593):     at com.magnusworks.justtic_tac_toe.GameScene.create(GameScene.java:45)
12-26 13:00:47.564: E/GameScene(21593):     at com.magnusworks.justtic_tac_toe.SceneManager$1.doInBackground(SceneManager.java:37)
12-26 13:00:47.564: E/GameScene(21593):     at com.magnusworks.justtic_tac_toe.SceneManager$1.doInBackground(SceneManager.java:1)
12-26 13:00:47.564: E/GameScene(21593):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
12-26 13:00:47.564: E/GameScene(21593):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-26 13:00:47.564: E/GameScene(21593):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-26 13:00:47.564: E/GameScene(21593):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-26 13:00:47.564: E/GameScene(21593):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-26 13:00:47.564: E/GameScene(21593):     at java.lang.Thread.run(Thread.java:841)

在此位置

/*44*/try{
        /*45*/sm = (SensorManager) this.activity.getSystemService(Context.SENSOR_SERVICE); //<--- here          
/*46*/  acceleration = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
            sm.registerListener(this, acceleration, SensorManager.SENSOR_DELAY_NORMAL);
        }
        catch(Exception f){
            Log.e("GameScene", "Error intializing sensors", f);
        }

我是否错误地初始化了传感器管理器？

Answer 1

在您的情况下，

this.activity为null。

将其替换为：

if (this.activity != null) {
    sm = (SensorManager) this.activity.getSystemService(Context.SENSOR_SERVICE);
}

Answer 2

你写了一个易受攻击的声明：

$subject = $_POST['mounth'];

将此语句修改为：

def rshift(val, n):
    s = val & 0x80000000
    for i in range(0,n):
        val >>= 1
        val |= s
    return val

当我们在mainActivity.java类中扩展Activity类时，方法sm = (SensorManager) this.activity.getSystemService(Context.SENSOR_SERVICE);可供您使用。不需要写sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);。

初始化android Sensor Manager时出错

2 个答案: