一个按钮的onClick后获得的x秒传感器数据 [英] Obtaining sensor data for x seconds after onClick of a button
问题描述
我还在学习Android的发展很抱歉,如果这个问题似乎愚蠢的,但我想从手机获得加速度的数据只在有限的时间。要单击一个按钮后约3秒才会记录是针对来自传感器的x坐标值的目标。
I'm still learning Android Development so sorry if this question seems stupid but I'm trying to obtain accelerometer data from the Phone for a limited time only. The goal is for the x-coordinate values from the sensor to be recorded only for about 3 seconds after a button is clicked.
public class AccelerometerTestingActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;
float x_event[];
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
sensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);
// add listener. The listener will be HelloAndroid (this) class
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_GAME);
}
public void onAccuracyChanged(Sensor sensor,int accuracy){
}
public void onSensorChanged(SensorEvent event){
// check sensor type
if(event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){
// assign directions
float x=event.values[0];
x_event=addArrayElement(x_event,x);
}
}
private float[] addArrayElement(float[] currentArray, float x) {
// TODO Auto-generated method stub
float newArray[] = new float[currentArray.length+1];
int i= 0;
for(i=0;i<currentArray.length;i++)
{
newArray[i] = currentArray[i];
}
newArray[i+1]=x;
return newArray;
}
所以x_event是填充有加速度计的每SENSOR_DELAY_GAME X位置周期性阵列。
So x_event is an array filled with the X position of the Accelerometer periodically every SENSOR_DELAY_GAME.
问题是,当活动正在运行此code记录所有的值。
The thing is, this code records all values while activity is running.
我想是只从按钮被点击的时间来填补这个数组,并填充只为x秒(还没有决定x的值还)。在这以后,阵列将被传递到用于分析另一功能
What I would like is for this array to be filled only from the time a button is clicked, and filled only for x seconds (haven't decided on the value of x yet). After that the array would be passed to another function for analysis.
我只是不明白如何限制监听器的时间。
I just don't understand how to limit the Listener in time.
感谢您的帮助。
推荐答案
下面是一个快速的解决方案;
在你的的onCreate()
您已经注册了监听器后,你可以这样做:
Here's a quick solution;
in your onCreate()
after you have registered your listener, you can do this:
final SensorEventListener listener = this;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
sensorManager.unregisterListener(listener);
}
}, theTimeInMilliseconds);
您也应该考虑使用一个列表,而不是一个数组来保存你的价值观,所以你不必每次你得到一个新值时重新创建它:
You should also consider using a list rather than an array to save your values, so you don't have to recreate it every time you get a new value:
ArrayList<Float> xEvent = new ArrayList<Float>();
和添加项目:
xEvent.add(event.values[0]);
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