Question

我的代码如下：

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;


public class MainActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;

TextView xCoor; // declare X axis object
TextView yCoor; // declare Y axis object
TextView zCoor; // declare Z axis object

@Override
public void onCreate(Bundle savedInstanceState){

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    xCoor=(TextView)findViewById(R.id.xcoor); // create X axis object
    yCoor=(TextView)findViewById(R.id.ycoor); // create Y axis object
    zCoor=(TextView)findViewById(R.id.zcoor); // create Z axis object

    // add listener. The listener will be HelloAndroid (this) class
    sensorManager.registerListener(this,
            sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
            SensorManager.SENSOR_DELAY_NORMAL);

    /*  More sensor speeds (taken from api docs)
        SENSOR_DELAY_FASTEST get sensor data as fast as possible
        SENSOR_DELAY_GAME   rate suitable for games
        SENSOR_DELAY_NORMAL rate (default) suitable for screen orientation changes
    */
}

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];
        float y=event.values[1];
        float z=event.values[2];
// to display the 
        xCoor.setText("Accelerometer X: "+ x);
        yCoor.setText("Accelerometer Y: "+ y);
        zCoor.setText("Accelerometer Z: "+ z);
    }
}

我需要在其中一个轴改变其值时触发警报....当发生意外并且我的x轴发生变化并触发视频上传事件时说出来....是否有人知道并愿意指导我？

Answer 1

你需要这样的东西（注意，这是一个比Android功能特定代码更好的例子）：

float foo = 100f;//Some default value

public void compareX(float x) { //Call this from your onSensorChanged and pass it the X value
float diff = x - foo;
if(diff>threshold) //threshold is the baseline value for your sudden change
{
uploadVideo();
}
else{
foo = x;
}

这很可能在实践中不起作用，因为传感器会非常快地为您提供新值，并且差异不可能高于阈值。相反，您需要对其进行编辑以在短时间内存储传感器的最大值和最小值，并检查它们与阈值的差异。例如，记录3秒钟内的最大值和最小值，并进行比较。如果他们的差异大于您应该根据某些事故测试数据预先计算的阈值，那么您上传视频或您想要做的任何事情。

如何在加速度计中3轴的值发生变化时触发警报？

1 个答案: