Android編程基于重力傳感器實現(xiàn)橫豎屏放向切換功能

更新時間：2018年01月26日 11:44:35 作者：yuyuyuzhen

這篇文章主要介紹了Android編程基于重力傳感器實現(xiàn)橫豎屏放向切換功能,結(jié)合具體實例形式分析了Android基于重力傳感器實現(xiàn)橫豎屏切換的相關(guān)操作技巧,需要的朋友可以參考下

本文實例講述了Android編程基于重力傳感器實現(xiàn)橫豎屏放向切換功能。分享給大家供大家參考，具體如下：

最近項目中用到了vr視頻播放，因為自己實現(xiàn)，同時要實現(xiàn)橫豎屏自動切換屏幕，核心代碼如下：

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.
 * 監(jiān)聽重力系統(tǒng)傳感器的變化，為Vr視頻播放器而定制
 */
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, "轉(zhuǎn)到了橫屏");
          if(!MySensorHelper.this.isLandLock) {
            Activity mActivity = (Activity)MySensorHelper.this.mActivityWeakRef.get();
            if(mActivity != null) {
              Log.e(MySensorHelper.TAG, "轉(zhuǎn)到了橫屏##################");
              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, "轉(zhuǎn)到了豎屏");
          if(!MySensorHelper.this.isPortLock) {
            Activity mActivity = (Activity)MySensorHelper.this.mActivityWeakRef.get();
            if(mActivity != null) {
              Log.e(MySensorHelper.TAG, "轉(zhuǎn)到了豎屏!!!!!!!!!!!!!!!!!!!!!!");
              mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
              isPortLock=true;
              isLandLock=false;
            }
          }
        }
      }
    };
   //this.disable();
  }
  //禁用切換屏幕的開關(guān)
  public void disable() {
    Log.e(TAG, "disable");
    this.mPortOrientationListener.disable();
    this.mLandOrientationListener.disable();
  }
  //開啟橫豎屏切換的開關(guān)
  public void enable(){
    this.mPortOrientationListener.enable();
    this.mLandOrientationListener.enable();
  }
  //設(shè)置豎屏是否上鎖，true鎖定屏幕,fanle解鎖
  public void setPortLock(boolean lockFlag) {
    this.isPortLock = lockFlag;
  }
  //設(shè)置橫屏是否鎖定，true鎖定，false解鎖
  public void setLandLock(boolean isLandLock){
    this.isLandLock=isLandLock;
  }
}

使用時將當前activity對象傳過來即可，但要在activity的ondestory()方法里面或者back鍵的監(jiān)聽里面禁用屏幕監(jiān)聽，否則會造成activity不能被回收而導(dǎo)致內(nèi)存泄漏