diff --git a/app/src/main/java/com/xypower/frpandroid/MainActivity.java b/app/src/main/java/com/xypower/frpandroid/MainActivity.java
index d5095e6..51d5d51 100644
--- a/app/src/main/java/com/xypower/frpandroid/MainActivity.java
+++ b/app/src/main/java/com/xypower/frpandroid/MainActivity.java
@@ -189,12 +189,16 @@ public class MainActivity extends AppCompatActivity {
         }));
 
         if (mBound) {
-            Intent intent = new Intent((Context)this, ShellService.class);
-            this.bindService(intent, (ServiceConnection)this.connection, Context.BIND_AUTO_CREATE);
-            logger.info("Binded service");
+            try {
+                Intent intent = new Intent((Context) this, ShellService.class);
+                bindService(intent, (ServiceConnection) this.connection, Context.BIND_AUTO_CREATE);
+                logger.info("Binded service");
+            } catch (Exception ex) {
+                logger.warning(ex.getMessage());
+            }
         }
 
-        this.setListener();
+        setListener();
 
         state_switch.setChecked(mBound || (startFrp != 0));
 
@@ -222,7 +226,7 @@ public class MainActivity extends AppCompatActivity {
     }
 
     private final void setListener() {
-        Button configButton = (Button)this.findViewById(R.id.configButton);
+        Button configButton = (Button)findViewById(R.id.configButton);
         configButton.setOnClickListener((View.OnClickListener)(new View.OnClickListener() {
             public final void onClick(View it) {
                 Intent intent = new Intent((Context)MainActivity.this, ConfigActivity.class);
@@ -231,13 +235,13 @@ public class MainActivity extends AppCompatActivity {
             }
         }));
 
-        Button refreshButton = (Button)this.findViewById(R.id.refreshButton);
+        Button refreshButton = (Button)findViewById(R.id.refreshButton);
         refreshButton.setOnClickListener((View.OnClickListener)(new View.OnClickListener() {
             public final void onClick(View it) {
                 MainActivity.this.readLog();
             }
         }));
-        Button deleteButton = (Button)this.findViewById(R.id.deleteButton);
+        Button deleteButton = (Button)findViewById(R.id.deleteButton);
         deleteButton.setOnClickListener((View.OnClickListener)(new View.OnClickListener() {
             public final void onClick(View it) {
                 MainActivity.this.mService.clearOutput();
@@ -247,10 +251,10 @@ public class MainActivity extends AppCompatActivity {
     }
 
     public final void readLog() {
-        TextView logTextView = (TextView)this.findViewById(R.id.logTextView);
+        TextView logTextView = (TextView)findViewById(R.id.logTextView);
         if (mBound) {
-            if (this.mService != null) {
-                logTextView.setText((CharSequence)this.mService.getOutput());
+            if (mService != null) {
+                logTextView.setText((CharSequence)mService.getOutput());
             }
         } else {
             Log.w("adx", "readLog mBound==null");
@@ -313,16 +317,20 @@ public class MainActivity extends AppCompatActivity {
             } else {
                 startService(intent);
             }
-            this.bindService(intent, (ServiceConnection) this.connection, Context.BIND_AUTO_CREATE);
+            bindService(intent, (ServiceConnection) connection, Context.BIND_AUTO_CREATE);
         } catch (Exception ex) {
             logger.warning(ex.getMessage());
         }
     }
 
     private final void stopShell() {
-        Intent intent = new Intent((Context)this, ShellService.class);
-        this.unbindService((ServiceConnection)this.connection);
-        this.stopService(intent);
+        try {
+            Intent intent = new Intent((Context) this, ShellService.class);
+            unbindService((ServiceConnection) connection);
+            stopService(intent);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
     }
 
     private final void checkNotificationPermission() {