Fix "could not load library libc++_shared.so" error

kujyp · Nov 8, 2019 · 479c159 · 479c159
1 parent b7b6703
commit 479c159
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Showing 4 changed files with 26 additions and 5 deletions.
diff --git a/app/build.gradle b/app/build.gradle
@@ -12,9 +12,14 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {
-                cppFlags ""
+                arguments '-DANDROID_TOOLCHAIN=clang',
+                          '-DANDROID_STL=c++_static'
+                cppFlags "-std=c++11"
             }
         }
+        ndk {
+            abiFilters 'x86', 'x86_64', 'arm64-v8a', 'armeabi-v7a'
+        }
     }
     buildTypes {
         release {

diff --git a/app/src/main/cpp/CMakeLists.txt b/app/src/main/cpp/CMakeLists.txt
@@ -5,7 +5,10 @@
 
 cmake_minimum_required(VERSION 3.4.1)
 
-set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--allow-multiple-definition -Wl,--whole-archive")
+set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} \
+                               -Wl,--allow-multiple-definition \
+                               -Wl,--whole-archive")
+
 # Creates and names a library, sets it as either STATIC
 # or SHARED, and provides the relative paths to its source code.
 # You can define multiple libraries, and CMake builds them for you.

diff --git a/app/src/main/cpp/native-lib.cpp b/app/src/main/cpp/native-lib.cpp
@@ -2,7 +2,7 @@
 #include <string>
 
 extern "C" JNIEXPORT jstring JNICALL
-Java_com_example_samplenative3_MainActivity_stringFromJNI(
+Java_com_example_samplenative3_MainActivity_internalStringFromJNI(
         JNIEnv *env,
         jobject /* this */) {
     std::string hello = "Hello from C++";

diff --git a/app/src/main/java/com/example/samplenative3/MainActivity.java b/app/src/main/java/com/example/samplenative3/MainActivity.java
@@ -6,10 +6,16 @@
 import android.widget.TextView;
 
 public class MainActivity extends AppCompatActivity {
+    private static boolean sNativeLibraryLoaded = false;
 
     // Used to load the 'native-lib' library on application startup.
     static {
-        System.loadLibrary("native-lib");
+        try {
+            System.loadLibrary("native-lib");
+            sNativeLibraryLoaded = true;
+        } catch (UnsatisfiedLinkError e) {
+            sNativeLibraryLoaded = false;
+        }
     }
 
     @Override
@@ -22,9 +28,16 @@ protected void onCreate(Bundle savedInstanceState) {
         tv.setText(stringFromJNI());
     }
 
+    private String stringFromJNI() {
+        if (!sNativeLibraryLoaded) {
+            return "error";
+        }
+        return internalStringFromJNI();
+    }
+
     /**
      * A native method that is implemented by the 'native-lib' native library,
      * which is packaged with this application.
      */
-    public native String stringFromJNI();
+    public native String internalStringFromJNI();
 }