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 Android教程網 >> Android技術 >> 關於Android編程 >> Android項目——傳感器的使用

Android項目——傳感器的使用

編輯:關於Android編程


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Sensor: " + x + ", " + y + ", " + z);

break;

case Sensor.TYPE_ORIENTATION:

/*x該值表示方位,0代表北(North);90代表東(East);180代表南(South);270代表西(West)

如果x值正好是這4個值之一,並且手機是水平放置,手機的頂部對准的方向就是該值代表的方向。

y值表示傾斜度,或手機翹起的程度。當手機繞著X軸傾斜時該值發生變化。y值的取值范圍是-180≤y值 ≤180。

假設將手機屏幕朝上水平放在桌子上,這時如果桌子是完全水平的,y值應該是0(由於很少有桌子是絕對水平的,

因此,該值很可能不為0,但一般都是-5和5之間的某個值)。這時從手機頂部開始抬起,

直到將手機沿X軸旋轉180度(屏幕向下水平放在桌面上)。

在這個旋轉過程中,y值會在0到-180之間變化,也就是說,從手機頂部抬起時,y的值會逐漸變小,

直到等於-180。如果從手機底部開始抬起,直到將手機沿X軸旋轉180度,這時y值會在0到180之間變化。

也就是y值會逐漸增大,直到等於180。可以利用y值和z值來測量桌子等物體的傾斜度。

z值表示手機沿著Y軸的滾動角度。表示手機沿著Y軸的滾動角度。取值范圍是-90≤z值≤90。

假設將手機屏幕朝上水平放在桌面上,這時如果桌面是平的,z值應為0。將手機左側逐漸抬起時,

z值逐漸變小,直到手機垂直於桌面放置,這時z值是-90。將手機右側逐漸抬起時,z值逐漸增大,

直到手機垂直於桌面放置,這時z值是90。在垂直位置時繼續向右或向左滾動,z值會繼續在-90至90之間變化。

*/

tvOrientation.setText("Orientation Sensor: " + x + ", " + y + ", " + z);

break;

}

}

@Override

public void onAccuracyChanged(Sensor sensor, int accuracy)

{

}

}

@Override

protected void onPause()

{

super.onPause();

//在失去焦點的時候 取消 這個傳感器對象上邊所有的監聽器

sensorManager.unregisterListener(sensorEventListener);

}

}

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