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：
package com.d1ev.touch.App.helper;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.util.Log;
import android.view.OrientationEventListener;
import java.lang.ref.WeakReference;
/**
* Created by Administrator on 2016/12/3 0003.
* 监听重力系统传感器的变化，为Vr视频播放器而定制
*/
public class MySensorHelper {
private static final String TAG = MySensorHelper.class.getSimpleName();
private OrientationEventListener mLandOrientationListener;
private OrientationEventListener mPortOrientationListener;
private WeakReference<Activity> mActivityWeakRef;
private boolean isPortLock = false;
private boolean isLandLock=false;
public MySensorHelper(final Activity activity) {
this.mActivityWeakRef = new WeakReference(activity);
this.mLandOrientationListener = new OrientationEventListener(activity, 3) {
public void onOrientationChanged(int orientation) {
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) {
Activity mActivity = (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 = new OrientationEventListener(activity, 3) {
public void onOrientationChanged(int orientation) {
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) {
Activity mActivity = (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
public void disable() {
Log.e(TAG, "disable");
this.mPortOrientationListener.disable();
this.mLandOrientationListener.disable();
}
//开启横竖屏切换的开关
public void enable(){
this.mPortOrientationListener.enable();
this.mLandOrientationListener.enable();
}
//设置竖屏是否上锁，true锁定屏幕,fanle解锁
public void setPortLock(boolean lockFlag) {
this.isPortLock = lockFlag;
}
//设置横屏是否锁定，true锁定，false解锁
public void setLandLock(boolean isLandLock){
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。
