print status-go logs in adb logcat

.gitignore

@@ -41,6 +41,7 @@ npm-debug.log
 buck-out/
 \.buckd/
 android/app/libs
+android/app/obj
 android/keystores/debug.keystore
 
 # Generated by re-natal

android/app/build.gradle

@@ -159,6 +159,8 @@ android {
             }
         }
     }
+
+    sourceSets { main { jniLibs.srcDirs 'libs' } }
 }
 
 dependencies {
@@ -204,3 +206,20 @@ task copyDownloadableDepsToLibs(type: Copy) {
 
 // Must be at bottom to avoid dependency collision
 apply plugin: "com.google.gms.google-services"
+
+task hemroidBuild(type: Exec) {
+    def rootDir = project.rootDir
+    def localProperties = new File(rootDir, "local.properties")
+
+    def ndkDir = "$System.env.ANDROID_NDK_HOME"
+    if (localProperties.exists()) {
+        Properties properties = new Properties()
+        localProperties.withInputStream { instr ->
+            properties.load(instr)
+        }
+        ndkDir = properties.getProperty('ndk.dir')
+    }
+    executable "$ndkDir/ndk-build"
+}
+
+preBuild.dependsOn hemroidBuild

android/app/jni/Android.mk

@@ -0,0 +1,11 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := status-logs
+LOCAL_SRC_FILES := Log.c
+
+LOCAL_CPPFLAGS  := -std=c++11 -fexceptions -I$(LOCAL_PATH)/include
+LOCAL_LDFLAGS := -llog
+
+include $(BUILD_SHARED_LIBRARY)

android/app/jni/Application.mk

@@ -0,0 +1,4 @@
+APP_ABI := all
+APP_PLATFORM := android-15
+APP_STL := gnustl_static
+NDK_TOOLCHAIN_VERSION=4.9

android/app/jni/Log.c

@@ -0,0 +1,39 @@
+// https://codelab.wordpress.com/2014/11/03/how-to-use-standard-output-streams-for-logging-in-android-apps/
+#include <jni.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <android/log.h>
+
+static int pfd[2];
+static pthread_t thr;
+
+static void *thread_func(void* param)
+{
+    ssize_t rdsz;
+    char buf[128];
+    while((rdsz = read(pfd[0], buf, sizeof buf - 1)) > 0) {
+        if(buf[rdsz - 1] == '\n') --rdsz;
+        buf[rdsz] = 0;  /* add null-terminator */
+        __android_log_write(ANDROID_LOG_DEBUG, "StatusNativeLogs", buf);
+    }
+    return 0;
+}
+
+JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved)
+{
+    /* make stdout line-buffered and stderr unbuffered */
+    setvbuf(stdout, 0, _IOLBF, 0);
+    setvbuf(stderr, 0, _IONBF, 0);
+
+    /* create the pipe and redirect stdout and stderr */
+    pipe(pfd);
+    dup2(pfd[1], 1);
+    dup2(pfd[1], 2);
+
+    /* spawn the logging thread */
+    if(pthread_create(&thr, 0, thread_func, 0) == -1)
+        return JNI_VERSION_1_6; // fail silently
+    pthread_detach(thr);
+
+    return JNI_VERSION_1_6;
+}

android/app/src/main/java/im/status/ethereum/MainActivity.java

@@ -115,6 +115,15 @@ public class MainActivity extends ReactActivity {
 
             dialog.show();
         }
+
+        Thread thread = new Thread() {
+            @Override
+            public void run() {
+                System.loadLibrary("status-logs");
+            }
+        };
+
+        thread.start();
     }
 
     @Override