有没有办法检测Android设备的当前方向?
我不是在谈论屏幕方向,而是指设备实际上被持有的方式。到目前为止,我找到的所有解决方案都告诉我屏幕方向(在我的应用中始终是纵向)。我需要知道用户是否水平持有设备,即使我没有旋转屏幕。
谢谢。
有没有办法检测Android设备的当前方向?
我不是在谈论屏幕方向,而是指设备实际上被持有的方式。到目前为止,我找到的所有解决方案都告诉我屏幕方向(在我的应用中始终是纵向)。我需要知道用户是否水平持有设备,即使我没有旋转屏幕。
谢谢。
SensorEvent.values [0]
):表示设备的右侧边缘在左侧边缘下面。SensorEvent.values [1]
):表示顶部边缘在底部边缘下面。SensorEvent.values [2]
):表示设备的前面朝向地面,因此必须颠倒前面的两个规则。/**
* Logs the device orientation. Results are not valid when the screen is facing the ground.
* (when the discriminant value is low (i.e. device almost horizontal) : no logs)
*/
public void onSensorChanged(SensorEvent event) {
if (event.sensor == mAccelerometer) {
if(Math.abs(event.values[1]) > Math.abs(event.values[0])) {
//Mainly portrait
if (event.values[1] > 1) {
Log.d(TAG,"Portrait");
} else if (event.values[1] < -1) {
Log.d(TAG,"Inverse portrait");
}
}else{
//Mainly landscape
if (event.values[0] > 1) {
Log.d(TAG,"Landscape - right side up");
} else if (event.values[0] < -1) {
Log.d(TAG,"Landscape - left side up");
}
}
}
}
在2.2版本之前,您可以使用方向传感器来实现此功能-这只是加速度计和磁力计的花式混搭,然后在2.2版本之后被弃用。现在,您可以自己编写该类的代码。
来源:https://dev59.com/qGkv5IYBdhLWcg3w3Uk0#10291428public class OrientationTestActivity extends Activity implements SensorEventListener
{
private SensorManager mSensorManager;
private Sensor mAccelerometer;
private Sensor mMagnetometer;
private float[] mLastAccelerometer = new float[3];
private float[] mLastMagnetometer = new float[3];
private boolean mLastAccelerometerSet = false;
private boolean mLastMagnetometerSet = false;
private float[] mR = new float[9];
private float[] mOrientation = new float[3];
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mMagnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
}
protected void onResume() {
super.onResume();
mLastAccelerometerSet = false;
mLastMagnetometerSet = false;
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
mSensorManager.registerListener(this, mMagnetometer, SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
public void onSensorChanged(SensorEvent event) {
if (event.sensor == mAccelerometer) {
System.arraycopy(event.values, 0, mLastAccelerometer, 0, event.values.length);
mLastAccelerometerSet = true;
} else if (event.sensor == mMagnetometer) {
System.arraycopy(event.values, 0, mLastMagnetometer, 0, event.values.length);
mLastMagnetometerSet = true;
}
if (mLastAccelerometerSet && mLastMagnetometerSet) {
SensorManager.getRotationMatrix(mR, null, mLastAccelerometer, mLastMagnetometer);
SensorManager.getOrientation(mR, mOrientation);
Log.i("OrientationTestActivity", String.format("Orientation: %f, %f, %f",
mOrientation[0], mOrientation[1], mOrientation[2]));
}
}
}