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：

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();

希望本文所述对大家Android程序设计有所帮助。

来源：http://blog.csdn.net/yuyuyuzhen/article/details/53444525