我需要将电话方向从1-360拉为整数,而不使用OrientationEventListener来检查onOrientationChanged()
能做到吗?我做了很多谷歌搜索,并且走得还很远。
谢谢
最佳答案
您可能需要使用加速度计来获得精确的角度。以下内容摘自Vogella:
public class SensorTestActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;
private boolean color = false;
private View view;
private long lastUpdate;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
view = findViewById(R.id.textView);
view.setBackgroundColor(Color.GREEN);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
lastUpdate = System.currentTimeMillis();
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
getAccelerometer(event);
}
}
private void getAccelerometer(SensorEvent event) {
float[] values = event.values;
// Movement
float x = values[0];
float y = values[1];
float z = values[2];
float accelationSquareRoot = (x * x + y * y + z * z)
/ (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH);
long actualTime = System.currentTimeMillis();
if (accelationSquareRoot >= 2) //
{
if (actualTime - lastUpdate < 200) {
return;
}
lastUpdate = actualTime;
Toast.makeText(this, "Device was shuffed", Toast.LENGTH_SHORT)
.show();
if (color) {
view.setBackgroundColor(Color.GREEN);
} else {
view.setBackgroundColor(Color.RED);
}
color = !color;
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
@Override
protected void onResume() {
super.onResume();
// register this class as a listener for the orientation and
// accelerometer sensors
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
// unregister listener
super.onPause();
sensorManager.unregisterListener(this);
}
}
至于采取什么角度,这可能会有所帮助:
方位角(围绕z轴的旋转度)。这是角度
在磁北和设备的y轴之间。例如,如果
设备的y轴与磁北对齐,该值为0,如果
设备的y轴指向南方,该值为180。同样,
当y轴指向东时,此值为90;当为
向西指向此值是270。
螺距(绕x轴旋转的角度)。当z轴的正向y轴旋转时,此值为正,
当正z轴朝向旋转时为负
负y轴。值的范围是180度到-180度。
滚动(绕y轴的旋转度)。当z轴的正向x轴旋转时,此值为正,
当正z轴朝向旋转时为负
负x轴。值的范围是90度到-90度。
参考:
http://www.vogella.com/tutorials/AndroidSensor/article.html
http://developer.android.com/guide/topics/sensors/sensors_position.html