Cocos2dx 2.x 安卓重力檢測 旋轉螢幕

標籤：cocos2d-x   android   

在充電的情況下，玩手機的時候，螢幕一般需要特定的旋轉方向。

功能實現分成兩部分：一部分根據手機重力方向X,Y,Z得出所需要的角度；另一方面根據旋轉角度，設定旋轉螢幕方向。

通過監聽手機相對於X,Y,Z方向的值，算出繞著某一軸的角度。X,Y方向分別平行於手機介面，Z垂直於手機介面。

本文以繞Y軸旋轉為例，如需繞Z軸只需把Y和Z互換，一般情況下只會要求這兩種情況。

代碼借鑒網上的。

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 根據旋轉角度，設定螢幕方向。

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;}@Overridepublic 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函數裡面添加

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);

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Cocos2dx 2.x 安卓重力檢測 旋轉螢幕