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();

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android开发入门与进阶教程》、《Android视图View技巧总结》、《Android编程之activity操作技巧总结》、《Android文件操作技巧汇总》、《Android资源操作技巧汇总》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。