diff --git a/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java b/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java
index 0505712..af55d66 100644
--- a/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java
+++ b/app/src/main/java/net/ossrs/yasea/demo/MainActivity.java
@@ -125,7 +125,7 @@ public class MainActivity extends AppCompatActivity implements RtmpHandler.RtmpL
         btnSwitchCamera.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                mPublisher.switchCameraFace((mPublisher.getCamraId() + 1) % Camera.getNumberOfCameras());
+                mPublisher.switchCameraFace((mPublisher.getCameraId() + 1) % Camera.getNumberOfCameras());
             }
         });
 
diff --git a/library/src/main/java/net/ossrs/yasea/SrsPublisher.java b/library/src/main/java/net/ossrs/yasea/SrsPublisher.java
index 8324440..a8664de 100644
--- a/library/src/main/java/net/ossrs/yasea/SrsPublisher.java
+++ b/library/src/main/java/net/ossrs/yasea/SrsPublisher.java
@@ -242,7 +242,7 @@ public class SrsPublisher {
         return mSamplingFps;
     }
 
-    public int getCamraId() {
+    public int getCameraId() {
         return mCameraView.getCameraId();
     }