在充电的情况下,玩手机的时候,屏幕一般需要特定的旋转方向。
功能实现分成两部分:一部分根据手机重力方向X,Y,Z得出所需要的角度;另一方面根据旋转角度,设置屏幕旋转方向。
通过监听手机相对于X,Z方向的值,算出绕着某一轴的角度。X,Y方向分别平行于手机界面,Z垂直于手机界面。
本文以绕Y轴旋转为例,如需绕Z轴只需把Y和Z互换,一般情况下只会要求这两种情况。
代码借鉴网上的。
package com.gamemaster.orientation; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.os.Handler; public class OrientationSensorListener implements SensorEventListener { private static final int _DATA_X = 0; private static final int _DATA_Y = 1; private static final int _DATA_Z = 2; public static final int ORIENTATION_UNKNOWN = -1; private Handler rotateHandler; public OrientationSensorListener(Handler handler) { rotateHandler = handler; } public void onAccuracyChanged(Sensor arg0,int arg1) { // TODO Auto-generated method stub } public void onSensorChanged(SensorEvent event) { float[] values = event.values; int orientation = ORIENTATION_UNKNOWN; float X = -values[_DATA_X]; float Y = -values[_DATA_Y]; float Z = -values[_DATA_Z]; float magnitude = X*X + Z*Z; // Don't trust the angle if the magnitude is small compared to the y value if (magnitude * 4 >= Y*Y) { float OneEightyOverPi = 57.29577957855f; float angle = (float)Math.atan2(-Z,X) * OneEightyOverPi; orientation = 90 - (int)Math.round(angle); // normalize to 0 - 359 range while (orientation >= 360) { orientation -= 360; } while (orientation < 0) { orientation += 360; } } if (rotateHandler!=null) { rotateHandler.obtainMessage(888,orientation,0).sendToTarget(); } } }
第二部分 根据旋转角度,设置屏幕方向。
package com.gamemaster.orientation; import android.app.Activity; import android.os.Handler; import android.os.Message; import android.util.Log; public class ChangeOrientationHandler extends Handler { private Activity activity; public ChangeOrientationHandler(Activity ac) { super(); activity = ac; } @Override public void handleMessage(Message msg) { if (msg.what==888) { int orientation = msg.arg1; if (orientation>70&&orientation<135) { activity.setRequestedOrientation(8); }else if (orientation>135&&orientation<225){ //activity.setRequestedOrientation(9); }else if (orientation>225&&orientation<290){ activity.setRequestedOrientation(0); }else if ((orientation>315&&orientation<360)||(orientation>0&&orientation<45)){ //activity.setRequestedOrientation(1); } } super.handleMessage(msg); } }
在Cocos2dxActivity中的onCreate外面添加
private Handler handler; private OrientationSensorListener listener; private SensorManager sm; private Sensor sensor;
在onCreate函数里面添加
handler = new ChangeOrientationHandler(this); sm = (SensorManager)getSystemService(Context.SENSOR_SERVICE); sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); listener = new OrientationSensorListener(handler); sm.registerListener(listener,sensor,SensorManager.SENSOR_DELAY_UI);