Android编程基于重力传感器实现横竖屏放向切换功能
本文实例讲述了Android编程基于重力传感器实现横竖屏放向切换功能。分享给大家供大家参考，具体如下：
最近项目中用到了vr视频播放，因为自己实现，同时要实现横竖屏自动切换屏幕，核心代码如下：
packagecom.d1ev.touch.App.helper;
importandroid.app.Activity;
importandroid.content.pm.ActivityInfo;
importandroid.util.Log;
importandroid.view.OrientationEventListener;
importjava.lang.ref.WeakReference;
/**
*CreatedbyAdministratoron2016/12/30003.
*监听重力系统传感器的变化，为Vr视频播放器而定制
*/
publicclassMySensorHelper{
privatestaticfinalStringTAG=MySensorHelper.class.getSimpleName();
privateOrientationEventListenermLandOrientationListener;
privateOrientationEventListenermPortOrientationListener;
privateWeakReferencemActivityWeakRef;
privatebooleanisPortLock=false;
privatebooleanisLandLock=false;
publicMySensorHelper(finalActivityactivity){
this.mActivityWeakRef=newWeakReference(activity);
this.mLandOrientationListener=newOrientationEventListener(activity,3){
publicvoidonOrientationChanged(intorientation){
Log.d(MySensorHelper.TAG,"mLandOrientationListener");
if(orientation<100&&orientation>80||orientation<280&&orientation>260){
Log.e(MySensorHelper.TAG,"转到了横屏");
if(!MySensorHelper.this.isLandLock){
ActivitymActivity=(Activity)MySensorHelper.this.mActivityWeakRef.get();
if(mActivity!=null){
Log.e(MySensorHelper.TAG,"转到了横屏##################");
mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
isLandLock=true;
isPortLock=false;
}
}
}
}
};
this.mPortOrientationListener=newOrientationEventListener(activity,3){
publicvoidonOrientationChanged(intorientation){
Log.w(MySensorHelper.TAG,"mPortOrientationListener");
if(orientation<10||orientation>350||orientation<190&&orientation>170){
Log.e(MySensorHelper.TAG,"转到了竖屏");
if(!MySensorHelper.this.isPortLock){
ActivitymActivity=(Activity)MySensorHelper.this.mActivityWeakRef.get();
if(mActivity!=null){
Log.e(MySensorHelper.TAG,"转到了竖屏!!!!!!!!!!!!!!!!!!!!!!");
mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
isPortLock=true;
isLandLock=false;
}
}
}
}
};
//this.disable();
}
//禁用切换屏幕的开关
publicvoiddisable(){
Log.e(TAG,"disable");
this.mPortOrientationListener.disable();
this.mLandOrientationListener.disable();
}
//开启横竖屏切换的开关
publicvoidenable(){
this.mPortOrientationListener.enable();
this.mLandOrientationListener.enable();
}
//设置竖屏是否上锁，true锁定屏幕,fanle解锁
publicvoidsetPortLock(booleanlockFlag){
this.isPortLock=lockFlag;
}
//设置横屏是否锁定，true锁定，false解锁
publicvoidsetLandLock(booleanisLandLock){
this.isLandLock=isLandLock;
}
}
使用时将当前activity对象传过来即可，但要在activity的ondestory()方法里面或者back键的监听里面禁用屏幕监听，否则会造成activity不能被回收而导致内存泄漏
helper.disable();
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希望本文所述对大家Android程序设计有所帮助。