diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 11a62432..dc25f814 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -86,12 +86,16 @@
         <service
             android:name=".BridgeService"
             android:enabled="true"
-            android:exported="true"></service>
+            android:exported="true"
+            ></service>
 
         <activity
             android:name=".BridgeActivity"
             android:exported="true"
-            android:screenOrientation="landscape" />
+            android:launchMode="singleInstance"
+            android:screenOrientation="landscape"
+            android:process=":bridge_proc" />
+
         <activity
             android:name=".video.VideoActivity"
             android:exported="false"
diff --git a/app/src/main/java/com/xypower/mpapp/BridgeActivity.java b/app/src/main/java/com/xypower/mpapp/BridgeActivity.java
index 482ac326..7299171e 100644
--- a/app/src/main/java/com/xypower/mpapp/BridgeActivity.java
+++ b/app/src/main/java/com/xypower/mpapp/BridgeActivity.java
@@ -106,6 +106,8 @@ public class BridgeActivity extends AppCompatActivity {
                     }
                 }
 
+                Log.i(TAG, "Import Private Key result=" + (res ? "1" : "0"));
+
                 if (!TextUtils.isEmpty(resultFile)) {
                     FilesUtils.ensureParentDirectoryExisted(resultFile);
                     FilesUtils.writeTextFile(resultFile, res ? "1" : "0");
@@ -246,7 +248,7 @@ public class BridgeActivity extends AppCompatActivity {
                     Log.i(TAG, "BridgeActivity will finish automatically");
                     activity.finish();
                 }
-            }, 2000);
+            }, 200);
         }
     }