app, bind: separate the app package from gobind
Historically, the app package implemented Go runtime initialization. This was convoluted, so the package was used both by all-Go apps (currently based on Android's NativeActivity) and bind-based apps. With Go 1.5 we have -buildmode=c-shared, which does a lot of the work of the old app package. That code was removed a while back, but both all-Go and gobind-based apps still used package app. The intermingled initialization processes led to some strange states. This CL separates gobind-based apps completely from the app package. As part of that users are now expected to use System.loadLibrary themselves. (A future CL may want to make the loadLibrary call part of the .aar generated by gomobile bind.) Delete the libhello example, which has been replaced by gomobile bind, which could do with its own example at some point. Also delete the libhellojni example, which now has nothing to do with the x/mobile repository. Change-Id: I444397f246dbafe81e5c53532eb482c197d26f70 Reviewed-on: https://go-review.googlesource.com/11654 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This commit is contained in:
David Crawshaw
parent
20f0df5da5
commit
8144405762
37
app/Go.java
37
app/Go.java
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@ -1,37 +0,0 @@
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package go;
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import android.content.Context;
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import android.os.Looper;
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import android.util.Log;
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// Go is an entry point for libraries compiled in Go.
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// In an app's Application.onCreate, call:
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//
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// Go.init(getApplicationContext());
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//
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// When the function returns, it is safe to start calling
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// Go code.
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public final class Go {
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// init loads libgojni.so and starts the runtime.
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public static void init(final Context ctx) {
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if (Looper.myLooper() != Looper.getMainLooper()) {
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Log.wtf("Go", "Go.init must be called from main thread (looper="+Looper.myLooper().toString()+")");
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}
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if (running) {
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return;
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}
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running = true;
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// TODO(crawshaw): context.registerComponentCallbacks for runtime.GC
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System.loadLibrary("gojni");
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Go.run(ctx);
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new Thread("GoReceive") {
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public void run() { Seq.receive(); }
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}.start();
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}
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private static boolean running = false;
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private static native void run(Context ctx);
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}
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@ -45,7 +45,6 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved) {
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current_vm = vm;
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current_ctx = NULL;
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current_native_activity = NULL;
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return JNI_VERSION_1_6;
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}
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@ -121,15 +120,15 @@ static void* call_main_and_wait() {
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callMain(mainPC);
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}
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// Runtime entry point when using NativeActivity.
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// Entry point from NativeActivity.
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//
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// By here, the Go runtime has been initialized (as we are running in
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// -buildmode=c-shared) but main.main hasn't been called yet.
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void ANativeActivity_onCreate(ANativeActivity *activity, void* savedState, size_t savedStateSize) {
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current_native_activity = activity;
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if (current_ctx == NULL) {
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// Note that activity->clazz is mis-named.
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current_vm = activity->vm;
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current_ctx = (*activity->env)->NewGlobalRef(activity->env, activity->clazz);
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call_main_and_wait();
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}
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// Note that activity->clazz is mis-named.
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current_vm = activity->vm;
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current_ctx = (*activity->env)->NewGlobalRef(activity->env, activity->clazz);
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call_main_and_wait();
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// These functions match the methods on Activity, described at
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// http://developer.android.com/reference/android/app/Activity.html
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@ -153,23 +152,3 @@ void ANativeActivity_onCreate(ANativeActivity *activity, void* savedState, size_
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onCreate(activity);
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}
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// Runtime entry point when embedding Go in a Java App.
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JNIEXPORT void JNICALL
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Java_go_Go_run(JNIEnv* env, jclass clazz, jobject ctx) {
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current_ctx = (*env)->NewGlobalRef(env, ctx);
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if (current_ctx != NULL) {
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// Init asset_manager.
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jclass context_clazz = find_class(env, "android/content/Context");
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jmethodID getassets = find_method(
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env, context_clazz, "getAssets", "()Landroid/content/res/AssetManager;");
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// Prevent the java AssetManager from being GC'd
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jobject asset_manager_ref = (*env)->NewGlobalRef(
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env, (*env)->CallObjectMethod(env, current_ctx, getassets));
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asset_manager = AAssetManager_fromJava(env, asset_manager_ref);
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}
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call_main_and_wait();
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}
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@ -14,11 +14,9 @@ until this is complete. Next JNI_OnLoad is called. When that is
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complete, one of two entry points is called.
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All-Go apps built using NativeActivity enter at ANativeActivity_onCreate.
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Go libraries, such as those built with gomobild bind, enter from Java at
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Java_go_Go_run.
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Both entry points make a cgo call that calls the Go main and blocks
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until app.Run is called.
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Go libraries (for example, those built with gomobile bind) do not use
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the app package initialization.
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*/
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package app
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@ -49,9 +47,6 @@ jobject current_ctx;
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jclass app_find_class(JNIEnv* env, const char* name);
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// current_native_activity is the Android ANativeActivity. May be NULL.
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ANativeActivity* current_native_activity;
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// asset_manager is the asset manager of the app.
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// For all-Go app, this is initialized in onCreate.
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// For go library app, this is set from the context passed to Go.run.
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@ -291,10 +286,6 @@ func main(f func(App)) {
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close(donec)
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}()
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if C.current_native_activity == nil {
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<-donec
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return
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}
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for w := range windowCreated {
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if windowDraw(w, queue, donec) {
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return
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@ -14,6 +14,13 @@ import java.util.concurrent.Executors;
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// Seq is a sequence of machine-dependent encoded values.
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// Used by automatically generated language bindings to talk to Go.
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public class Seq {
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static {
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initSeq();
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new Thread("GoSeq") {
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public void run() { Seq.receive(); }
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}.start();
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}
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@SuppressWarnings("UnusedDeclaration")
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private long memptr; // holds C-allocated pointer
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@ -67,10 +74,6 @@ public class Seq {
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return tracker.get(refnum);
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}
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static {
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initSeq();
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}
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static native void initSeq();
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// Informs the Go ref tracker that Java is done with this ref.
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@ -15,7 +15,7 @@ import go.testpkg.Testpkg;
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public class SeqTest extends AndroidTestCase {
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public SeqTest() {
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Go.init(this.getContext());
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System.loadLibrary("gojni");
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}
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public void testAdd() {
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@ -8,11 +8,3 @@
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//
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// Currently, this works only for android.
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package java
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// Init initializes communication with Java.
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// Typically called from the Start callback in app.Run.
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func Init() {
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close(running)
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}
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var running = make(chan struct{})
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@ -25,7 +25,6 @@ const debug = false
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// Send is called by Java to send a request to run a Go function.
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//export Send
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func Send(descriptor string, code int, req *C.uint8_t, reqlen C.size_t, res **C.uint8_t, reslen *C.size_t) {
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<-running
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fn := seq.Registry[descriptor][code]
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if fn == nil {
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panic(fmt.Sprintf("invalid descriptor(%s) and code(0x%x)", descriptor, code))
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@ -150,15 +150,8 @@ func runBind(cmd *command) error {
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return err
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}
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src := filepath.Join(repo, "app/Go.java")
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dst := filepath.Join(androidDir, "src/main/java/go/Go.java")
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rm(dst)
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if err := symlink(src, dst); err != nil {
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return err
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}
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src = filepath.Join(repo, "bind/java/Seq.java")
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dst = filepath.Join(androidDir, "src/main/java/go/Seq.java")
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src := filepath.Join(repo, "bind/java/Seq.java")
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dst := filepath.Join(androidDir, "src/main/java/go/Seq.java")
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rm(dst)
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if err := symlink(src, dst); err != nil {
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return err
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@ -292,15 +285,11 @@ var androidMainTmpl = template.Must(template.New("android.go").Parse(`
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package main
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import (
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"golang.org/x/mobile/app"
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"golang.org/x/mobile/bind/java"
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_ "golang.org/x/mobile/bind/java"
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_ "{{.}}"
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)
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func main() {
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app.Run(app.Callbacks{Start: java.Init})
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}
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func main() {}
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`))
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// AAR is the format for the binary distribution of an Android Library Project
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@ -1,23 +0,0 @@
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<?xml version="1.0" encoding="utf-8"?>
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<!--
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Copyright 2014 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file.
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-->
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<manifest
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xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.example.hello"
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android:versionCode="1"
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android:versionName="1.0">
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<application android:label="Hello">
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<activity android:name="com.example.hello.MainActivity"
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android:label="Hello"
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android:exported="true">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>
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@ -1,42 +0,0 @@
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The libhello app demonstrates calling Go code from a primarily Java app.
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Starting in Java lets you program against Android's extensive UI
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libraries in their native language and call into Go for library code
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(business logic, code shared with a Go server, portable code).
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The Java entry point to the program is the file
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src/com/example/hello/MainActivity.java, where the statement
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Hi.Hello("world");
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is a call into Go code.
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The Go code is in a package called hi, the file is hi/hi.go, and it
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contains the function Hello:
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func Hello(name string) {
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fmt.Printf("Hello, %s!\n", name)
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}
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Java language bindings are generated for this package using the gobind
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tool. There is a user guide for gobind at
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http://golang.org/x/mobile/cmd/gobind
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The generated source has been included in the distribution. If you
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modify the exported interface of package hi, you have to run gobind
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manually before calling all.bash.
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Along with the gobind generated source, the app includes a main.go file
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to define the app entry point.
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make.bash builds the app, all.bash deploys it.
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The first step in building the app is to build the native shared
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library out of the Go code, and place it in
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libs/armeabi-v7a/libgojni.so.
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The second step is building the app with the standard Android build
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system by calling ant debug (also done in make.bash). Two extra Java
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files are included in the build by make.bash to support the language
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bindings. This produces an apk ready for running on a device.
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@ -1,15 +0,0 @@
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#!/usr/bin/env bash
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# Copyright 2014 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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# Script to build and launch the app on an android device.
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set -e
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./make.bash
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adb install -r bin/Hello-debug.apk
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adb shell am start -a android.intent.action.MAIN \
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-n com.example.hello/com.example.hello.MainActivity
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@ -1,16 +0,0 @@
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:: Copyright 2014 The Go Authors. All rights reserved.
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:: Use of this source code is governed by a BSD-style
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:: license that can be found in the LICENSE file.
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@echo off
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setlocal
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echo # building libhello
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call make.bat
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echo # installing bin/Hello-debug.apk
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adb install -r bin/Hello-debug.apk >nul
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echo # starting com.example.hello.MainActivity
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adb shell am start -a android.intent.action.MAIN -n com.example.hello/com.example.hello.MainActivity >nul
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@ -1,15 +0,0 @@
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<?xml version="1.0" encoding="utf-8"?>
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<!--
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Copyright 2014 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file.
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-->
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<project name="Hello" default="help">
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<property name="target" value="android-19" />
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<property environment="env" />
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<condition property="sdk.dir" value="${env.ANDROID_HOME}">
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<isset property="env.ANDROID_HOME" />
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</condition>
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<fail message="missing ANDROID_HOME env variable" unless="sdk.dir" />
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<import file="${sdk.dir}/tools/ant/build.xml" />
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</project>
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@ -1,19 +0,0 @@
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// Package go_hi is an autogenerated binder stub for package hi.
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// gobind -lang=go golang.org/x/mobile/example/libhello/hi
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//
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// File is generated by gobind. Do not edit.
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package go_hi
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import (
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"golang.org/x/mobile/bind/seq"
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"golang.org/x/mobile/example/libhello/hi"
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)
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func proxy_Hello(out, in *seq.Buffer) {
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param_name := in.ReadUTF16()
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hi.Hello(param_name)
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}
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func init() {
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seq.Register("hi", 1, proxy_Hello)
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}
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@ -1,8 +0,0 @@
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// Package hi provides a function for saying hello.
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package hi
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import "fmt"
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func Hello(name string) {
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fmt.Printf("Hello, %s!\n", name)
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}
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@ -1,20 +0,0 @@
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// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
|
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// license that can be found in the LICENSE file.
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// This is the Go entry point for the libhello app.
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// It is invoked from Java.
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//
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// See README for details.
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package main
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import (
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"golang.org/x/mobile/app"
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"golang.org/x/mobile/bind/java"
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_ "golang.org/x/mobile/example/libhello/hi/go_hi"
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)
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func main() {
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app.Run(app.Callbacks{Start: java.Init})
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}
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@ -1,20 +0,0 @@
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#!/usr/bin/env bash
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# Copyright 2014 The Go Authors. All rights reserved.
|
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# Use of this source code is governed by a BSD-style
|
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# license that can be found in the LICENSE file.
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set -e
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if [ ! -f make.bash ]; then
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echo 'make.bash must be run from $GOPATH/src/golang.org/x/mobile/example/libhello'
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exit 1
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fi
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mkdir -p libs/armeabi-v7a src/go/hi
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ANDROID_APP=$PWD
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(cd ../.. && ln -sf $PWD/app/*.java $ANDROID_APP/src/go)
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(cd ../.. && ln -sf $PWD/bind/java/Seq.java $ANDROID_APP/src/go)
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CGO_ENABLED=1 GOOS=android GOARCH=arm GOARM=7 \
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go build -ldflags="-shared" .
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mv -f libhello libs/armeabi-v7a/libgojni.so
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ant debug
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@ -1,46 +0,0 @@
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:: Copyright 2014 The Go Authors. All rights reserved.
|
||||
:: Use of this source code is governed by a BSD-style
|
||||
:: license that can be found in the LICENSE file.
|
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|
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@echo off
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setlocal
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|
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if not exist make.bat goto error-invalid-path
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|
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:go-build
|
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if not exist libs\armeabi-v7a mkdir libs\armeabi-v7a
|
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if not exist src\go\hi mkdir src\go\hi
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if not exist jni\armeabi mkdir jni\armeabi
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|
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set CGO_ENABLED=1
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set GOOS=android
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set GOARCH=arm
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set GOARM=7
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set ANDROID_APP=%CD%
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|
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xcopy /y ..\..\app\*.java %ANDROID_APP%\src\go >nul
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copy /y ..\..\bind\java\Seq.java %ANDROID_APP%\src\go\Seq.java >nul
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|
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go build -ldflags="-shared" .
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if errorlevel 1 goto error-go-build
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|
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move /y libhello libs\armeabi-v7a\libgojni.so >nul
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|
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if defined ANT_HOME goto ant-build
|
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echo ANT_HOME path not defined
|
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goto end
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|
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:ant-build
|
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call %ANT_HOME%\bin\ant.bat debug >nul
|
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goto end
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|
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:error-invalid-path
|
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echo make.bat must be run from example\libhello
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goto end
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|
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:error-go-build
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echo Error building go lib
|
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goto end
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|
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:end
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|
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@ -1,29 +0,0 @@
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/*
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* Copyright 2014 The Go Authors. All rights reserved.
|
||||
* Use of this source code is governed by a BSD-style
|
||||
* license that can be found in the LICENSE file.
|
||||
*/
|
||||
|
||||
package com.example.hello;
|
||||
|
||||
import go.Go;
|
||||
import go.hi.Hi;
|
||||
import android.app.Activity;
|
||||
import android.os.Bundle;
|
||||
|
||||
/*
|
||||
* MainActivity is the entry point for the libhello app.
|
||||
*
|
||||
* From here, the Go runtime is initialized and a Go function is
|
||||
* invoked via gobind language bindings.
|
||||
*
|
||||
* See example/libhello/README for details.
|
||||
*/
|
||||
public class MainActivity extends Activity {
|
||||
@Override
|
||||
protected void onCreate(Bundle savedInstanceState) {
|
||||
super.onCreate(savedInstanceState);
|
||||
Go.init(getApplicationContext());
|
||||
Hi.Hello("world");
|
||||
}
|
||||
}
|
||||
|
|
@ -1,20 +0,0 @@
|
|||
// Java Package hi is a proxy for talking to a Go program.
|
||||
//
|
||||
// File is generated by gobind. Do not edit.
|
||||
package go.hi;
|
||||
|
||||
import go.Seq;
|
||||
|
||||
public abstract class Hi {
|
||||
private Hi() {} // uninstantiable
|
||||
|
||||
public static void Hello(String name) {
|
||||
go.Seq _in = new go.Seq();
|
||||
go.Seq _out = new go.Seq();
|
||||
_in.writeUTF16(name);
|
||||
Seq.send(DESCRIPTOR, CALL_Hello, _in, _out);
|
||||
}
|
||||
|
||||
private static final int CALL_Hello = 1;
|
||||
private static final String DESCRIPTOR = "hi";
|
||||
}
|
||||
|
|
@ -1,9 +0,0 @@
|
|||
// Copyright 2014 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package demo;
|
||||
|
||||
public class Demo {
|
||||
public static native void hello(String name);
|
||||
}
|
||||
|
|
@ -1,27 +0,0 @@
|
|||
// Copyright 2014 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build android
|
||||
|
||||
// See main.go for commentary.
|
||||
|
||||
#include <android/log.h>
|
||||
#include <jni.h>
|
||||
#include <limits.h>
|
||||
#include "_cgo_export.h"
|
||||
|
||||
JNIEXPORT void JNICALL
|
||||
Java_demo_Demo_hello(JNIEnv* env, jclass clazz, jstring jname) {
|
||||
// Turn Java's UTF16 string into (almost) UTF8.
|
||||
const char *name = (*env)->GetStringUTFChars(env, jname, 0);
|
||||
|
||||
GoString go_name;
|
||||
go_name.p = (char*)name;
|
||||
go_name.n = (*env)->GetStringUTFLength(env, jname);
|
||||
|
||||
// Call into Go.
|
||||
LogHello(go_name);
|
||||
|
||||
(*env)->ReleaseStringUTFChars(env, jname, name);
|
||||
}
|
||||
|
|
@ -1,27 +0,0 @@
|
|||
// Copyright 2014 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build android
|
||||
|
||||
package main
|
||||
|
||||
// #cgo LDFLAGS: -llog
|
||||
// #include <android/log.h>
|
||||
// #include <string.h>
|
||||
import "C"
|
||||
import (
|
||||
"fmt"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
//export LogHello
|
||||
func LogHello(name string) {
|
||||
fmt.Printf("Hello, %s!\n", name)
|
||||
|
||||
ctag := C.CString("Go")
|
||||
cstr := C.CString(fmt.Sprintf("Printing hello message for %q", name))
|
||||
C.__android_log_write(C.ANDROID_LOG_INFO, ctag, cstr)
|
||||
C.free(unsafe.Pointer(ctag))
|
||||
C.free(unsafe.Pointer(cstr))
|
||||
}
|
||||
|
|
@ -1,30 +0,0 @@
|
|||
// Copyright 2014 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
/*
|
||||
This example program compiles to a gojni.so shared library, that can
|
||||
be loaded from an android application. Build it by configuring a cross
|
||||
compiler (see go.mobile/README) and then running:
|
||||
|
||||
ANDROID_APP=/path/to/Myapp/app ./make.bash
|
||||
|
||||
This program expects app/Go.java to be included in the Android
|
||||
project, along with a Java class named Demo defining
|
||||
|
||||
public static native void hello();
|
||||
|
||||
calling hello prints "Hello, world!" to logcat.
|
||||
|
||||
This is a very early example program that does not represent the
|
||||
intended development model for Go on Android. A language binding
|
||||
generator will follow, as will gradle build system integration.
|
||||
The result will be no make.bash, and no need to write C.
|
||||
*/
|
||||
package main
|
||||
|
||||
import "golang.org/x/mobile/app"
|
||||
|
||||
func main() {
|
||||
app.Run(app.Callbacks{})
|
||||
}
|
||||
|
|
@ -1,27 +0,0 @@
|
|||
#!/usr/bin/env bash
|
||||
# Copyright 2014 The Go Authors. All rights reserved.
|
||||
# Use of this source code is governed by a BSD-style
|
||||
# license that can be found in the LICENSE file.
|
||||
|
||||
# See main.go for commentary.
|
||||
|
||||
set -e
|
||||
|
||||
if [ ! -f make.bash ]; then
|
||||
echo 'make.bash must be run from $GOPATH/src/golang.org/x/mobile/example/libhellojni'
|
||||
exit 1
|
||||
fi
|
||||
if [ -z "$ANDROID_APP" ]; then
|
||||
echo 'ERROR: Environment variable ANDROID_APP is unset.'
|
||||
exit 1
|
||||
fi
|
||||
|
||||
mkdir -p $ANDROID_APP/src/main/jniLibs/armeabi \
|
||||
$ANDROID_APP/src/main/java/go \
|
||||
$ANDROID_APP/src/main/java/demo
|
||||
(cd ../.. && ln -sf $PWD/app/*.java $ANDROID_APP/src/main/java/go)
|
||||
(cd ../.. && ln -sf $PWD/bind/java/*.java $ANDROID_APP/src/main/java/go)
|
||||
ln -sf $PWD/*.java $ANDROID_APP/src/main/java/demo
|
||||
CGO_ENABLED=1 GOOS=android GOARCH=arm GOARM=7 \
|
||||
go build -ldflags="-shared" .
|
||||
mv libhellojni $ANDROID_APP/src/main/jniLibs/armeabi/libgojni.so
|
||||
|
|
@ -1,39 +0,0 @@
|
|||
:: Copyright 2014 The Go Authors. All rights reserved.
|
||||
:: Use of this source code is governed by a BSD-style
|
||||
:: license that can be found in the LICENSE file.
|
||||
|
||||
@echo off
|
||||
|
||||
setlocal
|
||||
|
||||
if not exist make.bat goto error-invalid-path
|
||||
|
||||
set CGO_ENABLED=1
|
||||
set GOOS=android
|
||||
set GOARCH=arm
|
||||
set GOARM=7
|
||||
set ANDROID_APP=%CD%
|
||||
|
||||
if not exist src\main\jniLibs\armeabi mkdir src\main\jniLibs\armeabi
|
||||
if not exist src\main\java\go mkdir src\main\java\go
|
||||
if not exist src\main\java\demo mkdir src\main\java\demo
|
||||
|
||||
xcopy /y ..\..\app\*.java %ANDROID_APP%\src\main\java\go >nul
|
||||
xcopy /y ..\..\bind\java\*.java %ANDROID_APP%\src\main\java\go >nul
|
||||
xcopy /y %CD%\*.java %ANDROID_APP%\src\main\java\demo >nul
|
||||
|
||||
go build -ldflags="-shared" .
|
||||
if errorlevel 1 goto error-go-build
|
||||
|
||||
move /y libhellojni %ANDROID_APP%\src\main\jniLibs\armeabi\libgojni.so >nul
|
||||
goto end
|
||||
|
||||
:error-invalid-path
|
||||
echo make.bat must be run from example\libhellojni
|
||||
goto end
|
||||
|
||||
:error-go-build
|
||||
echo Error building go lib
|
||||
goto end
|
||||
|
||||
:end
|
||||
Loading…
Reference in New Issue