Merge pull request #43 from rmrs/fix/android_5_crash

fix: call getSystemService on main thread for Android <= 5

Author: erezrokah

android/src/main/java/io/rumors/reactnativesettings/listeners/CaptioningChangeListener.java

@@ -3,16 +3,51 @@
 import android.content.Intent;
 import android.content.Context;
 import android.view.accessibility.CaptioningManager;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Build;
 
 import io.rumors.reactnativesettings.handlers.CaptioningSettingsHandler;
 import io.rumors.reactnativesettings.Constants;
 
+import java.util.concurrent.CountDownLatch;
+
+
 public class CaptioningChangeListener extends CaptioningManager.CaptioningChangeListener {
   private Context mContext;
 
+  private CaptioningManager mCaptioningManager;
+
+  private CaptioningManager getCaptioningManager() {
+    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
+      return (CaptioningManager) mContext.getSystemService(Context.CAPTIONING_SERVICE);
+    } else {
+      // Android <= 5 bug workaround
+      // https://github.com/evernote/android-job/issues/48#issuecomment-221789418
+      final CountDownLatch latch = new CountDownLatch(1);
+
+      Handler handler = new Handler(Looper.getMainLooper());
+      handler.post(new Runnable() {
+          @Override
+          public void run() {
+              mCaptioningManager = (CaptioningManager) mContext.getSystemService(Context.CAPTIONING_SERVICE);
+              latch.countDown();
+          }
+      });
+  
+      try {
+          latch.await();
+      } catch (InterruptedException e) {
+          e.printStackTrace();
+      }
+  
+      return mCaptioningManager;
+    }
+  }
+
   public CaptioningChangeListener(Context context) {
     this.mContext = context;
-    CaptioningManager captioningManager = (CaptioningManager) mContext.getSystemService(Context.CAPTIONING_SERVICE);
+    CaptioningManager captioningManager = getCaptioningManager();
     captioningManager.addCaptioningChangeListener(this);
   }