string test

Author: baiiu

jni/jnitest/src/main/AndroidManifest.xml

@@ -9,20 +9,20 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".SplashActivity">
-            <intent-filter>
-                <action android:name="android.intent.action.MAIN" />
-
-                <category android:name="android.intent.category.LAUNCHER" />
-            </intent-filter>
-        </activity>
-
-        <activity android:name=".MainActivity">
+<!--        <activity android:name=".SplashActivity">-->
 <!--            <intent-filter>-->
 <!--                <action android:name="android.intent.action.MAIN" />-->
 
 <!--                <category android:name="android.intent.category.LAUNCHER" />-->
 <!--            </intent-filter>-->
+<!--        </activity>-->
+
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
         </activity>
     </application>
 

jni/jnitest/src/main/cpp/string/StringTest.cpp

@@ -41,4 +41,41 @@ Java_com_baiiu_jnitest_string_StringTestFragment_stringMethod(JNIEnv *env, jobje
 
     env->ReleaseStringUTFChars(jStr, str);
 
+}
+
+extern "C"
+JNIEXPORT void JNICALL
+Java_com_baiiu_jnitest_string_StringTestFragment_callJava(JNIEnv *env, jobject thiz) {
+
+    jclass clazz = env->FindClass("com/baiiu/jnitest/string/StringTestFragment");
+    jmethodID methodId = env->GetStaticMethodID(clazz, "decorateUrl",
+                                                "(Ljava/lang/String;)Ljava/lang/String;");
+
+    jstring jstr = env->NewStringUTF("test");
+    jobject decorateObject = env->CallStaticObjectMethod(clazz, methodId, jstr);
+
+    const char *afterUrl = env->GetStringUTFChars(static_cast<jstring>(decorateObject), JNI_FALSE);
+    LOGD("afterUrl %s", afterUrl);
+
+    env->ReleaseStringUTFChars(jstr, afterUrl);
+}
+
+extern "C"
+JNIEXPORT void JNICALL
+Java_com_baiiu_jnitest_string_StringTestFragment_callJavaFree(JNIEnv *env, jobject thiz) {
+
+    jclass clazz = env->FindClass("com/baiiu/jnitest/string/StringTestFragment");
+    jmethodID methodId = env->GetMethodID(clazz, "decorateUrlFree",
+                                          "(Ljava/lang/String;)Ljava/lang/String;");
+
+    jstring jstr = env->NewStringUTF("test");
+    jobject decorateObject = env->CallObjectMethod(thiz, methodId, jstr);
+
+    if (decorateObject) {
+        const char *afterUrl = env->GetStringUTFChars(static_cast<jstring>(decorateObject),
+                                                      JNI_FALSE);
+        LOGD("afterUrl %s", afterUrl);
+
+        env->ReleaseStringUTFChars(jstr, afterUrl);
+    }
 }

jni/jnitest/src/main/java/com/baiiu/jnitest/MainActivity.java

@@ -11,6 +11,7 @@
 import com.baiiu.jnitest.exception.ExceptionFragment;
 import com.baiiu.jnitest.reference.PassReferenceFragment;
 import com.baiiu.jnitest.reference.ReferenceFragment;
+import com.baiiu.jnitest.string.StringTestFragment;
 import com.baiiu.jnitest.testSocket.TestSocketFragment;
 import com.baiiu.jnitest.thread.ThreadCallbackFragment;
 import com.baiiu.jnitest.thread.ThreadCreateFragment;
@@ -37,7 +38,7 @@ private Fragment getFragment() {
 
 //        return new TypeConvertFragment();
 
-//        return new StringTestFragment();
+        return new StringTestFragment();
 
 //        return new PassReferenceFragment();
 
@@ -59,7 +60,7 @@ private Fragment getFragment() {
 
 //        return new DLOpenFragment();
 
-        return new EpollFragment();
+//        return new EpollFragment();
     }
 
 

jni/jnitest/src/main/java/com/baiiu/jnitest/string/StringTestFragment.java

@@ -13,10 +13,27 @@ protected void initOnCreateView() {
         callNativeString("java Str");
 
         stringMethod("abcdefg");
+
+        callJava();
+        callJavaFree();
     }
 
+
     public native String callNativeString(String str);
 
     public native void stringMethod(String str);
 
+    public native void callJava();
+
+    public native void callJavaFree();
+
+    public static String decorateUrl(String url) {
+        return "decorate: " + url;
+    }
+
+    public String decorateUrlFree(String url) {
+//        return "decorate free: " + url;
+        return null; // GetStringUTFChars参数不能为null
+    }
+
 }