Click-Event-and-Listener.md

 Listener for clicking each button or animation-states.
 
+###Listener in Each Builder
+You can add a simple listener for each boom-button by adding to each builder of them.
+```
+for (int i = 0; i < bmb.getPiecePlaceEnum().pieceNumber(); i++) {
+    SimpleCircleButton.Builder builder = new SimpleCircleButton.Builder()
+            .listener(new OnBMClickListener() {
+                @Override
+                public void onBoomButtonClick(int index) {
+                    // When the boom-button corresponding this builder is clicked.
+                    Toast.makeText(SimpleCircleButtonActivity.this, "Clicked " + index, Toast.LENGTH_SHORT).show();
+                }
+            });
+    bmb.addBuilder(builder);
+}
+```
+
+###Listener for BMB
+If you want to manager all the click events in a method, you can use `OnBoomListener` / `OnBoomListenerAdapter`:
+```
+// Use OnBoomListener to listen all methods
+bmb.setOnBoomListener(new OnBoomListener() {
+    @Override
+    public void onClicked(int index, BoomButton boomButton) {
+        // If you have implement listeners for boom-buttons in builders,
+        // then you shouldn't add any listener here for duplicate callbacks.
+    }
+
+    @Override
+    public void onBackgroundClick() {
+        textViewForAnimation.setText("Click background!!!");
+    }
+
+    @Override
+    public void onBoomWillHide() {
+        textViewForAnimation.setText("Will RE-BOOM!!!");
+    }
+
+    @Override
+    public void onBoomDidHide() {
+        textViewForAnimation.setText("Did RE-BOOM!!!");
+    }
+
+    @Override
+    public void onBoomWillShow() {
+        textViewForAnimation.setText("Will BOOM!!!");
+    }
+
+    @Override
+    public void onBoomDidShow() {
+        textViewForAnimation.setText("Did BOOM!!!");
+    }
+});
+```
+Or in `OnBoomListenerAdapter`(Optional listener):
+```
+// Use OnBoomListenerAdapter to listen part of methods
+bmb.setOnBoomListener(new OnBoomListenerAdapter() {
+    @Override
+    public void onBoomWillShow() {
+        super.onBoomWillShow();
+        // logic here
+    }
+});
+```
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