Cocos2dx 2.x 安卓重力检测 旋转屏幕，cocos2dx安卓
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,Y,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);
版权声明：本文为博主原创文章，未经博主允许不得转载。
http://www.bkjia.com/Androidjc/1035313.htmlwww.bkjia.comtruehttp://www.bkjia.com/Androidjc/1035313.htmlTechArticleCocos2dx 2.x 安卓重力检测 旋转屏幕，cocos2dx安卓 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...
