為了解決這個問題，我們需要修改我們resume觸發的時機。確保在解鎖以後才進入我們遊戲的resume狀態。
那麽我們遊戲應該在什麽時機進入resume狀態呢？
系統activity進入resume狀態時刻，並且屏幕是亮的，屏幕未鎖定
屏幕剛剛亮起，並且屏幕 未鎖定，系統activity已經進入resume狀態
屏幕 解鎖，這是屏幕肯定是亮的，並且activity已經進入resume狀態
那麽有了上面的三點相信邏輯代碼不難寫，下面介紹壹下如何堅挺系統屏幕滅，屏幕亮，解鎖屏幕 的事件，以及如何判斷當前屏幕 是否是解鎖狀態（因為用戶可以設置關閉屏幕後是否鎖定屏幕 ，所以解鎖屏幕 事件可能根本就不會被觸發，那麽我們就不能通過跟蹤事件來確定其狀態）
要堅挺屏幕亮、屏幕滅、屏幕 解鎖三個事件我們需要在代碼中註冊監聽ACTION_SCREEN_ON、ACTION_SCREEN_OFF、ACTION_USER_PRESENT三個Action，具體的寫法如下：
[java] view plaincopy
/**
* screen狀態廣播接收者
*/
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();
}
}
}
[java] view plaincopy
/**
* 停止screen狀態更新
*/
public void stopScreenStateUpdate() {
mContext.unregisterReceiver(mScreenReceiver);
}
/**
* 啟動screen狀態廣播接收器
*/
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);
}
因為屏幕在滅了以後是否鎖定可以由用戶設置，所以我們不能通過跟蹤解鎖事件來判斷其狀態，需要壹個可以時時獲取狀態的函數：
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//判斷屏幕是否被鎖定
public final static boolean isScreenLocked(Context c) {
android.app.KeyguardManager mKeyguardManager = (KeyguardManager) c.getSystemService(c.KEYGUARD_SERVICE);
return mKeyguardManager.inKeyguardRestrictedInputMode();
}
需要註意的是，大部分事件都可以在AndroidManifest.xml中註冊，但是ACTION_SCREEN_ON、ACTION_SCREEN_OFF、ACTION_USER_PRESENT這幾個事件在PowerManager那邊做了限制，必須像上面那樣在代碼中註冊，才能監聽到，所以大家不要踩到坑哦~~~
下面是包裝屏幕事件的壹個類代碼，僅供參考：
[java] view plaincopy
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;
/**
* 監聽屏幕ON和OFF PRESENT狀態
*
* @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狀態廣播接收者
*/
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();
}
}
}
/**
* 請求screen狀態更新
*/
public void requestScreenStateUpdate(ScreenStateListener listener) {
mScreenStateListener = listener;
startScreenBroadcastReceiver();
firstGetScreenState();
}
/**
* 第壹次請求screen狀態
*/
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狀態更新
*/
public void stopScreenStateUpdate() {
mContext.unregisterReceiver(mScreenReceiver);
}
/**
* 啟動screen狀態廣播接收器
*/
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是否打開狀態
*/
private static boolean isScreenOn(PowerManager pm) {
boolean screenState;
try {
screenState = (Boolean) mReflectScreenState.invoke(pm);
} catch (Exception e) {
screenState = false;
}
return screenState;
}
// 外部調用接口
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();
}
}