Question

我想获得0到90度之间的角度，当我的设备处于90度然后我获得105度时，我在SensorChnaged上获得了错误的学位所以请帮助我获得正确的角度我已经在设备三星Galaxy s duos和micromax上进行了测试，并且还会让UI冻结。

private void init() {
        oldBitmap = BitmapFactory.decodeResource(getResources(),
                R.drawable.clock1);
        w = oldBitmap.getWidth();
        h = oldBitmap.getHeight();
        mtx = new Matrix();
        degrees = Integer.parseInt(x.toString());
        mtx.postRotate(-degrees);
        oldBitmap = Bitmap.createBitmap(oldBitmap, 0, 0, w, h, mtx, true);
        img.setScaleType(ScaleType.CENTER);
        img.setImageBitmap(oldBitmap);
    }
    @Override
    protected void onResume() {
        super.onResume();
        sensorManager.registerListener(this,
                sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
                SensorManager.SENSOR_DELAY_NORMAL);
        sensorManager.registerListener(this,
                sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),
                SensorManager.SENSOR_DELAY_NORMAL);
    }
    @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.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {                  
            //x = (int) Math.pow(event.values[0], 2);  // is for the right to left or left to right side angle
            //x = (int) Math.pow(event.values[2], 2); // this is for the bottom to top or top to bottom side angle
            x = (int) Math.pow(event.values[1], 2); // this is for both side angle

            try {
                Log.i("my x is..", "my degree is..."+x);    
                    txtanglex.setText(x.toString());            
                    init();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

从上面的代码我得到0到105之间的设备角度

enter image description here

Answer 1

以下是使用传感器获取角度的示例代码

private float[] mGravity;
private float[] mMagnetic;
private float angle_value;

private float getDirection()
{

    float[] temp = new float[9];
    float[] R = new float[9];
    //Load rotation matrix into R
    SensorManager.getRotationMatrix(temp, null,
            mGravity, mMagnetic);

    //Remap to camera's point-of-view
    SensorManager.remapCoordinateSystem(temp,
            SensorManager.AXIS_X,
            SensorManager.AXIS_Z, R);

    //Return the orientation values
    float[] values = new float[3];
    SensorManager.getOrientation(R, values);

    //Convert to degrees
    for (int i=0; i < values.length; i++) {
        Double degrees = (values[i] * 180) / Math.PI;
        values[i] = degrees.floatValue();
    }

    return values[0];

}

@Override
public void onSensorChanged(SensorEvent event) {
    switch(event.sensor.getType()) {

    case Sensor.TYPE_ACCELEROMETER:
        mGravity = event.values.clone();
        break;
    case Sensor.TYPE_MAGNETIC_FIELD:
        mMagnetic = event.values.clone();
        break;
    default:
        return;
    }
    if(mGravity != null && mMagnetic != null) {
        angle_value = getDirection();
    }
}

如果您只想angle_value，那么0-180必须是0-90，然后才能使用这样的逻辑。

if(angle_value>90)
{
   angle_value=angle_value-90;
}

在传感器更改时，设备角度在0到105度之间

1 个答案: