Question

我正在开发一个Android应用程序，我想在其中使用加速度计。但每当我打电话给这个方法时：

SensorManager sm = (SensorManager)context.getSystemService(Context.SEARCH_SERVICE);

我的应用程序崩溃了。

我的代码是：

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    context = getApplicationContext();
    SensorManager sm = (SensorManager)context.getSystemService(Context.SEARCH_SERVICE);
    if(sm.getSensorList(Sensor.TYPE_ACCELEROMETER).size()!=0)
    {

        Sensor s = sm.getSensorList(Sensor.TYPE_ACCELEROMETER).get(0);
        sm.registerListener(this, s, SensorManager.SENSOR_DELAY_NORMAL);
    }

    x = y = sensorX = sensorY = 0;

}

我在网上搜索但无法找到任何解决方案。我正在手机上调试我的应用程序而不是在模拟器上。在这方面请帮助我，为什么它会崩溃，我该如何解决它。

以下是日志cat错误： 05-02 06：40：04.299：W / dalvikvm（9525）：threadid = 1：线程退出未捕获异常（组= 0x40018578）

   05-02 06:40:04.309: E/AndroidRuntime(9525): FATAL EXCEPTION: main
   05-02 06:40:04.309: E/AndroidRuntime(9525): java.lang.RuntimeException: Unable to     start activity ComponentInfo{com.accelerometer/com.accelerometer.AccelerometerActivity}: java.lang.ClassCastException: android.app.SearchManager

   05-02 06:40:04.309: E/AndroidRuntime(9525):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)

  05-02 06:40:04.309: E/AndroidRuntime(9525):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)

  05-02 06:40:04.309: E/AndroidRuntime(9525):   at android.app.ActivityThread.access$1500(ActivityThread.java:117)

  05-02 06:40:04.309: E/AndroidRuntime(9525):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)

  05-02 06:40:04.309: E/AndroidRuntime(9525):   at android.os.Handler.dispatchMessage(Handler.java:99)

  05-02 06:40:04.309: E/AndroidRuntime(9525):   at android.os.Looper.loop(Looper.java:123)

  05-02 06:40:04.309: E/AndroidRuntime(9525):   at android.app.ActivityThread.main(ActivityThread.java:3687)

 05-02 06:40:04.309: E/AndroidRuntime(9525):    at java.lang.reflect.Method.invokeNative(Native Method)

 05-02 06:40:04.309: E/AndroidRuntime(9525):    at java.lang.reflect.Method.invoke(Method.java:507)

 05-02 06:40:04.309: E/AndroidRuntime(9525):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)

 05-02 06:40:04.309: E/AndroidRuntime(9525):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)

 05-02 06:40:04.309: E/AndroidRuntime(9525):    at dalvik.system.NativeStart.main(Native Method)

 05-02 06:40:04.309: E/AndroidRuntime(9525): Caused by: java.lang.ClassCastException: android.app.SearchManager

 05-02 06:40:04.309: E/AndroidRuntime(9525):    at com.accelerometer.AccelerometerActivity.onCreate(AccelerometerActivity.java:24)

05-02 06:40:04.309: E/AndroidRuntime(9525):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

05-02 06:40:04.309: E/AndroidRuntime(9525):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)

感谢。

Answer 1

SensorManager sm = (SensorManager)context.getSystemService(Context.SEARCH_SERVICE);

这将从getSystemService()返回一个SearchManager，您无法将SearchManager转换为SensorManager，关闭但不完全相同......

要获取SensorManager，请尝试以下操作:(取自Dev Guide）

 public SensorActivity() {
     mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
     mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
 }

应用程序在SensorManager上崩溃

1 个答案: