Attempt to fix selector memeory leak. Add update checker

app/src/main/java/com/stardust/scriptdroid/service/AccessibilityWatchDogService.java

@@ -4,12 +4,16 @@ import android.accessibilityservice.AccessibilityService;
 import android.os.Build;
 import android.util.Log;
 import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityNodeInfo;
 
+import com.stardust.autojs.runtime.JavascriptInterface;
 import com.stardust.view.accessibility.AccessibilityDelegate;
 import com.stardust.scriptdroid.App;
 import com.stardust.scriptdroid.tool.AccessibilityServiceTool;
 import com.stardust.view.accessibility.AccessibilityServiceUtils;
 
+import org.greenrobot.eventbus.EventBus;
+
 import java.lang.ref.WeakReference;
 import java.util.Map;
 import java.util.SortedMap;
@@ -26,7 +30,8 @@ public class AccessibilityWatchDogService extends AccessibilityService {
     private static final String TAG = "AccessibilityWatchDog";
 
     private static final SortedMap<Integer, AccessibilityDelegate> mDelegates = new TreeMap<>();
-    private static WeakReference<AccessibilityWatchDogService> instance;
+    private static final Object LOCK = new Object();
+    private static AccessibilityWatchDogService instance;
     private Executor mExecutor = Executors.newSingleThreadExecutor();
 
     public static void addDelegate(int uniquePriority, AccessibilityDelegate delegate) {
@@ -38,9 +43,7 @@ public class AccessibilityWatchDogService extends AccessibilityService {
     }
 
     public static AccessibilityWatchDogService getInstance() {
-        if (instance == null)
-            return null;
-        return instance.get();
+        return instance;
     }
 
     @Override
@@ -58,24 +61,52 @@ public class AccessibilityWatchDogService extends AccessibilityService {
         });
     }
 
+    @Override
+    public AccessibilityNodeInfo getRootInActiveWindow() {
+        try {
+            return super.getRootInActiveWindow();
+        } catch (IllegalStateException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
     @Override
     public void onInterrupt() {
     }
 
+    @Override
+    public void onDestroy() {
+        instance = null;
+        super.onDestroy();
+    }
+
     @Override
     protected void onServiceConnected() {
-        super.onServiceConnected();
-        // FIXME: 2017/2/12 有时在无障碍中开启服务后这里不会调用服务也不会运行，安卓的BUG???
         Log.v(TAG, "onServiceConnected");
-        instance = new WeakReference<>(this);
+        instance = this;
+        super.onServiceConnected();
+        synchronized (LOCK) {
+            LOCK.notifyAll();
+        }
+        // FIXME: 2017/2/12 有时在无障碍中开启服务后这里不会调用服务也不会运行，安卓的BUG???
     }
 
     public static void disable() {
-        if (instance != null && instance.get() != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-            instance.get().disableSelf();
+        if (instance != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            instance.disableSelf();
         } else {
             AccessibilityServiceTool.goToAccessibilitySetting();
         }
     }
 
+    public static void waitForEnabled(long timeOut) {
+        synchronized (LOCK) {
+            try {
+                LOCK.wait(timeOut);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
 }