我希望创建一个在安卓上追踪路径的应用程序。我已经使用以下代码计算不同方向上的加速度。
package com.example.usrivast.accelerometer;
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.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class MainActivity extends Activity implements SensorEventListener{
Sensor accelerometer = null;
SensorManager sm = null;
TextView acceleration = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sm = (SensorManager)getSystemService(SENSOR_SERVICE);
accelerometer = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sm.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
acceleration = (TextView)findViewById(R.id.acceleration);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onSensorChanged(SensorEvent event) {
acceleration.setText("x: " + event.values[0] + "\ny: " + event.values[1] + "\nz: " + event.values[2]);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
但是我无法理解这些数值的输出。它们变化非常快。即使我的手机处于静止状态,这些值也会变化。 当我的手机静置在桌子上时,这些值的示例为: x:-0.1278 y:0.2968 z:9.6323 它们变化非常快。我正在使用 Nexus 5。