Android利用方向传感器获得手机的相对角度实例说明

package com.example.sensortest;
import java.util.List;
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.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class SensorTest extends Activity implements SensorEventListener{

private SensorManager sensorManager = null;
private Sensor gyroSensor = null;
private TextView vX;
private TextView vY;
private TextView vZ;
private TextView v;
private Button button;
private static final float NS2S = 1.0f / 1000000000.0f;
private float timestamp;
private float[] angle = new float[3];
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sensor_test);
vX = (TextView) findViewById(R.id.vx);
vY = (TextView)findViewById(R.id.vy);
vZ = (TextView)findViewById(R.id.vz);
v = (TextView)findViewById(R.id.v);
button = (Button)findViewById(R.id.button);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
gyroSensor = sensorManager
.getDefaultSensor(Sensor.TYPE_ORIENTATION);
vX.setText("!!!!!!");
button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
//声明可变字符串
StringBuffer sb = new StringBuffer();
//获取手机全部的传感器
List<Sensor> sensors = sensorManager.getSensorList(Sensor.TYPE_ALL);
//迭代输出获得上的传感器
for (Sensor sensor : sensors) {
//System.out.println(sensor.getName().toString());
sb.append(sensor.getName().toString());
sb.append("/n");
Log.i("Sensor", sensor.getName().toString());
}
//给文本控件赋值
v.setText(sb.toString());
}
});
}
public SensorTest() {
// TODO Auto-generated constructor stub
angle[0] = 0;
angle[1] = 0;
angle[2] = 0;
timestamp = 0;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_sensor_test, menu);
return true;
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
sensorManager.unregisterListener(this); // 解除监听器注册
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
sensorManager.registerListener(this, gyroSensor,
SensorManager.SENSOR_DELAY_NORMAL); //为传感器注册监听器
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub

}
@Override
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
// if (event.accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE)
// {
// return;
// }

// if (timestamp != 0) {
// final float dT = (event.timestamp - timestamp) * NS2S;
// angle[0] += event.values[0] * dT * 100;
// angle[1] += event.values[1] * dT * 100;
// angle[2] += event.values[2] * dT * 100;
// }
// timestamp = event.timestamp;
//
//
// vX.setText("X: " + Float.toString(angle[0]));
// vY.setText("Y: " + Float.toString(angle[1]));
// vZ.setText("Z: " + Float.toString(angle[2]));

// 方向传感器提供三个数据，分别为azimuth、pitch和roll。
//
// azimuth：方位，返回水平时磁北极和Y轴的夹角，范围为0°至360°。
// 0°=北，90°=东，180°=南，270°=西。
//
// pitch：x轴和水平面的夹角，范围为-180°至180°。
// 当z轴向y轴转动时，角度为正值。
//
// roll：y轴和水平面的夹角，由于历史原因，范围为-90°至90°。
// 当x轴向z轴移动时，角度为正值。

vX.setText("Orientation X: " + event.values[0]);
vY.setText("Orientation Y: " + event.values[1]);
vZ.setText("Orientation Z: " + event.values[2]);

}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SensorTest"
android:orientation="vertical"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="获取传感器"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/v"
android:textSize="30px"
></TextView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/vx"
android:textSize="50px"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/vy"
android:textSize="50px"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/vz"
android:textSize="50px"
/>
</LinearLayout>