diff --git a/android-example/app/src/main/java/net/irext/ircontrol/controller/ArduinoSocket.java b/android-example/app/src/main/java/net/irext/ircontrol/controller/ArduinoSocket.java
index 4fb6b1b..506a334 100644
--- a/android-example/app/src/main/java/net/irext/ircontrol/controller/ArduinoSocket.java
+++ b/android-example/app/src/main/java/net/irext/ircontrol/controller/ArduinoSocket.java
@@ -81,7 +81,7 @@ public class ArduinoSocket {
                             callback.onResponse(response);
                         }
                     }
-                    
+
                     if (callback != null) {
                         callback.onDisconnected();
                     }
@@ -93,7 +93,7 @@ public class ArduinoSocket {
                     if (callback != null) {
                         callback.onDisconnected();
                     }
-                    
+
                     connectionStatus = EMITTER_DISCONNECTED;
                 }
             }).start();
diff --git a/android-example/app/src/main/java/net/irext/ircontrol/controller/PhoneRemote.java b/android-example/app/src/main/java/net/irext/ircontrol/controller/PhoneRemote.java
index 91808f0..5ae308a 100644
--- a/android-example/app/src/main/java/net/irext/ircontrol/controller/PhoneRemote.java
+++ b/android-example/app/src/main/java/net/irext/ircontrol/controller/PhoneRemote.java
@@ -1,25 +1,38 @@
 package net.irext.ircontrol.controller;
 
 import android.content.Context;
+import android.util.Log;
 import net.irext.decode.sdk.IRDecode;
 import net.irext.decode.sdk.bean.ACStatus;
 import net.irext.ircontrol.controller.implementable.IRemote;
 
 public class PhoneRemote implements IRemote {
 
+    private static final String TAG = PhoneRemote.class.getSimpleName();
+
     IRDecode mIRDecode;
 
     Context mContext;
     public PhoneRemote(Context context) {
         mContext = context;
+        mIRDecode = new IRDecode();
     }
 
     @Override
     public int irControl(int category, int subCategory, int keyCode) {
         int []decoded;
+        StringBuilder debugStr = new StringBuilder();
         ACStatus acStatus = new ACStatus();
         int inputKeyCode = ControlUtils.translateKeyCode(category, keyCode, acStatus);
         decoded = mIRDecode.decodeBinary(inputKeyCode, acStatus);
+
+        for (int i = 0; i < decoded.length; i++) {
+            debugStr.append(decoded[i]);
+            if (i != decoded.length - 1) {
+                debugStr.append(",");
+            }
+        }
+        Log.d(TAG, "IR control decoded: " + debugStr);
         ControlUtils.transmitIr(mContext, decoded);
         return 0;
     }
diff --git a/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java b/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java
index 22352e9..5810693 100644
--- a/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java
+++ b/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java
@@ -197,7 +197,12 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
         String binFileName = FileUtils.binDir + FileUtils.FILE_NAME_PREFIX +
                 mCurrentRemoteControl.getRemoteMap() + FileUtils.FILE_NAME_EXT;
         byte []binContent = FileUtils.getByteArrayFromFile(binFileName);
-        mArduinoSocket.sendBinToEmitter(binContent, mCurrentRemoteControl.getCategoryId(), mCurrentRemoteControl.getSubCategory());
+        if (null != binContent) {
+            mArduinoSocket.sendBinToEmitter(binContent, mCurrentRemoteControl.getCategoryId(), mCurrentRemoteControl.getSubCategory());
+        } else {
+            Log.e(TAG, "emitter sender could not open the binary file");
+            ToastUtils.showToast(mParent, mParent.getString(R.string.file_could_not_open), Toast.LENGTH_SHORT);
+        }
     }
 
     private void processECtrl(String response) {
@@ -248,7 +253,7 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
             keyCode = IRemote.KEY_MENU;
         }
 
-        if (mArduinoSocket.isConnected()) {
+        if (mArduinoSocket.isConnected() && mArduinoSocket.getConnectionStatus() == ArduinoSocket.EMITTER_BIN_RECEIVED) {
             remote = new ArduinoRemote(mParent, mArduinoSocket);
         } else {
             remote = new PhoneRemote(mParent);
diff --git a/android-example/app/src/main/res/values-zh-rCN/strings.xml b/android-example/app/src/main/res/values-zh-rCN/strings.xml
index c10e265..1d31e08 100644
--- a/android-example/app/src/main/res/values-zh-rCN/strings.xml
+++ b/android-example/app/src/main/res/values-zh-rCN/strings.xml
@@ -30,15 +30,20 @@
     <string name="button_ok">确定</string>
     <string name="button_plus">+</string>
     <string name="button_minus">-</string>
-    <string name="ir_not_supported">该设备不支持红外发射, 请连接外部模块进行发射</string>
 
+    <!-- Emitter panel -->
     <string name="emitter_ip">发射端 IP</string>
     <string name="default_ip">192.168.1.40</string>
     <string name="connect">连接</string>
     <string name="decode_on_board">在单片机上解码</string>
+
+    <!-- Error messages -->
+    <string name="ir_not_supported">该设备不支持红外发射, 请连接外部模块进行发射</string>
     <string name="input_emitter_ip_address">请输入接收器的 IP 地址</string>
     <string name="connect_failed">连接失败</string>
     <string name="connect_disconnected">连接已断开</string>
     <string name="status_not_connected">未连接</string>
     <string name="status_connected">已连接</string>
+    <string name="file_could_not_open">编码文件无法打开</string>
+
 </resources>
diff --git a/android-example/app/src/main/res/values/strings.xml b/android-example/app/src/main/res/values/strings.xml
index e824098..29afde5 100644
--- a/android-example/app/src/main/res/values/strings.xml
+++ b/android-example/app/src/main/res/values/strings.xml
@@ -30,16 +30,20 @@
     <string name="button_ok">OK</string>
     <string name="button_plus">+</string>
     <string name="button_minus">-</string>
-    <string name="ir_not_supported">IR emitter is not supported in this device, please try with external emitters</string>
 
+    <!-- Emitter panel -->
     <string name="emitter_ip">Emitter IP</string>
     <string name="default_ip">192.168.1.40</string>
-    <string name="connect">connect</string>
+    <string name="connect">Connect</string>
     <string name="decode_on_board">Decode On Board</string>
+
+    <!-- Error messages -->
+    <string name="ir_not_supported">IR emitter is not supported in this device, please try with external emitters</string>
     <string name="input_emitter_ip_address">Please input IP address of emitter</string>
     <string name="connect_failed">Connect failed</string>
     <string name="connect_disconnected">The connection has lost</string>
     <string name="status_not_connected">Disconnected</string>
     <string name="status_connected">Connected</string>
+    <string name="file_could_not_open">The IR binary file could not be opened</string>
 
 </resources>