有一部分三星的手机关闭屏幕以后,刚打开屏幕,前台的activity就会resume状态,因为我们使用cocos2d-x引擎,默认resume和activity的resume事件是一致的,我们在resume里把关闭的声音重新打开,所以导致,用户点亮屏幕以后(尚未解锁),就会听到游戏内的声音(如果在关闭屏幕时我们游戏处于前台)。
为了解决这个问题,我们需要修改我们resume触发的时机。确保在解锁以后才进入我们游戏的resume状态。
那么我们游戏应该在什么时机进入resume状态呢?
- 系统activity进入resume状态时刻,并且屏幕是亮的,屏幕未锁定
- 屏幕刚刚亮起,并且屏幕 未锁定,系统activity已经进入resume状态
- 屏幕 解锁,这是屏幕肯定是亮的,并且activity已经进入resume状态
那么有了上面的三点相信逻辑代码不难写,下面介绍一下如何坚挺系统屏幕灭,屏幕亮,解锁屏幕 的事件,以及如何判断当前屏幕 是否是解锁状态(因为用户可以设置关闭屏幕后是否锁定屏幕 ,所以解锁屏幕 事件可能根本就不会被触发,那么我们就不能通过跟踪事件来确定其状态)
要坚挺屏幕亮、屏幕灭、屏幕 解锁三个事件我们需要在代码中注册监听ACTION_SCREEN_ON、ACTION_SCREEN_OFF、ACTION_USER_PRESENT三个Action,具体的写法如下:
/** * screen状态广播接收者 */ private class ScreenBroadcastReceiver extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { if(Intent.ACTION_SCREEN_ON.equals(intent.getAction())){ mScreenStateListener.onScreenOn(); }else if(Intent.ACTION_SCREEN_OFF.equals(intent.getAction())){ mScreenStateListener.onScreenOff(); }else if(Intent.ACTION_USER_PRESENT.equals(intent.getAction())){ mScreenStateListener.onUserPresent(); } } }
/** * 停止screen状态更新 */ public void stopScreenStateUpdate() { mContext.unregisterReceiver(mScreenReceiver); } /** * 启动screen状态广播接收器 */ private void startScreenBroadcastReceiver() { IntentFilter filter = new IntentFilter(); filter.addAction(Intent.ACTION_SCREEN_ON); filter.addAction(Intent.ACTION_SCREEN_OFF); filter.addAction(Intent.ACTION_USER_PRESENT); mContext.registerReceiver(mScreenReceiver, filter); }
因为屏幕在灭了以后是否锁定可以由用户设置,所以我们不能通过跟踪解锁事件来判断其状态,需要一个可以时时获取状态的函数:
//判断屏幕是否被锁定 public final static boolean isScreenLocked(Context c) { android.app.KeyguardManager mKeyguardManager = (KeyguardManager) c.getSystemService(c.KEYGUARD_SERVICE); return mKeyguardManager.inKeyguardRestrictedInputMode(); }
需要注意的是,大部分事件都可以在AndroidManifest.xml中注册,但是ACTION_SCREEN_ON、ACTION_SCREEN_OFF、ACTION_USER_PRESENT这几个事件在PowerManager那边做了限制,必须像上面那样在代码中注册,才能监听到,所以大家不要踩到坑哦~~~
下面是包装屏幕事件的一个类代码,仅供参考:
package com.example.myfirstapp; import java.lang.reflect.Method; import android.app.Activity; import android.app.KeyguardManager; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.PowerManager; import android.util.Log; /** * 监听屏幕ON和OFF PRESENT状态 * * @author * @2014 * */ public class ScreenObserver { private static String TAG = "ScreenObserver"; private Context mContext; private ScreenBroadcastReceiver mScreenReceiver; private ScreenStateListener mScreenStateListener; private static Method mReflectScreenState; public ScreenObserver(Context context) { mContext = context; mScreenReceiver = new ScreenBroadcastReceiver(); try { mReflectScreenState = PowerManager.class.getMethod("isScreenOn", new Class[] {}); } catch (Exception nsme) { Log.d(TAG, "API < 7," + nsme); } } /** * screen状态广播接收者 */ private class ScreenBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (Intent.ACTION_SCREEN_ON.equals(intent.getAction())) { mScreenStateListener.onScreenOn(); } else if (Intent.ACTION_SCREEN_OFF.equals(intent.getAction())) { mScreenStateListener.onScreenOff(); } else if (Intent.ACTION_USER_PRESENT.equals(intent.getAction())) { mScreenStateListener.onUserPresent(); } } } /** * 请求screen状态更新 */ public void requestScreenStateUpdate(ScreenStateListener listener) { mScreenStateListener = listener; startScreenBroadcastReceiver(); firstGetScreenState(); } /** * 第一次请求screen状态 */ private void firstGetScreenState() { PowerManager manager = (PowerManager) mContext .getSystemService(Activity.POWER_SERVICE); if (isScreenOn(manager)) { if (mScreenStateListener != null) { mScreenStateListener.onScreenOn(); } } else { if (mScreenStateListener != null) { mScreenStateListener.onScreenOff(); } } } /** * 停止screen状态更新 */ public void stopScreenStateUpdate() { mContext.unregisterReceiver(mScreenReceiver); } /** * 启动screen状态广播接收器 */ private void startScreenBroadcastReceiver() { IntentFilter filter = new IntentFilter(); filter.addAction(Intent.ACTION_SCREEN_ON); filter.addAction(Intent.ACTION_SCREEN_OFF); filter.addAction(Intent.ACTION_USER_PRESENT); mContext.registerReceiver(mScreenReceiver, filter); } /** * screen是否打开状态 */ private static boolean isScreenOn(PowerManager pm) { boolean screenState; try { screenState = (Boolean) mReflectScreenState.invoke(pm); } catch (Exception e) { screenState = false; } return screenState; } // 外部调用接口 public interface ScreenStateListener { public void onScreenOn(); public void onScreenOff(); public void onUserPresent(); } public final static boolean isScreenLocked(Context c) { android.app.KeyguardManager mKeyguardManager = (KeyguardManager) c .getSystemService(c.KEYGUARD_SERVICE); return mKeyguardManager.inKeyguardRestrictedInputMode(); } }
Android系统亮屏、锁屏、屏幕解锁事件(解决部分手机亮屏后未解锁即进入resume状态),布布扣,bubuko.com