Simplify building

Author: Mygod

README.md

@@ -20,8 +20,6 @@
 
 You can check whether the latest commit builds under UNIX environment by checking CI status.
 
-* Set environment variable `ANDROID_HOME` to `/path/to/android-sdk`
-* (optional) Set environment variable `ANDROID_NDK_HOME` to `/path/to/android-ndk` (default: `$ANDROID_HOME/ndk-bundle`)
 * Clone the repo using `git clone --recurse-submodules <repo>` or update submodules using `git submodule update --init --recursive`
 * Build it using Android Studio or gradle script
 

app/build.gradle

@@ -50,6 +50,8 @@ task goBuild(type: Exec) {
     } else {
         executable "sh"
         args "-c", "src/make.bash " + minSdkVersion
+        environment "ANDROID_HOME", android.sdkDirectory
+        environment "ANDROID_NDK_HOME", android.ndkDirectory
     }
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.0-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip