新增：调用libcomclientjni.so，通过JNI执行testHello()。

app/build.gradle

@@ -26,6 +26,11 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+    sourceSets {
+        main {
+            jniLibs.srcDirs = ['src/main/jniLibs']
+        }
+    }
 }
 
 dependencies {

app/src/main/java/com/example/myjni/MainActivity.java

@@ -4,11 +4,16 @@ import androidx.appcompat.app.AppCompatActivity;
 
 import android.os.Bundle;
 
+import com.myjni.mynative.MyClientCmd;
+
 public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        MyClientCmd cmd = new MyClientCmd();
+        cmd.callHello();
     }
 }

app/src/main/java/com/myjni/mynative/MyClientCmd.java

@@ -0,0 +1,13 @@
+package com.myjni.mynative;
+
+public class MyClientCmd {
+    static {
+        System.loadLibrary("comclientjni"); // 注意去掉 lib 前缀和 .so 后缀
+    }
+
+    public native void testHello();
+
+    public void callHello() {
+        testHello();
+    }
+}