Working version of pgp example before restructuring.

.gitignore

@@ -1,9 +1,11 @@
 *.ast
 *.apk
-*.jar
 *.dex
 *.class
+examples/jni/AClass.jar
+examples/pgp/PgpConnect.jar
 examples/sensors/sensors
 examples/jni/jni
 examples/dex/dex
+examples/pgp/pgp
 examples/permissions/permissions

examples/pgp/PgpConnect.java

@@ -0,0 +1,61 @@
+package st.wow.git.pgp;
+
+import java.lang.Runnable;
+import java.lang.String;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import android.os.Handler;
+import java.io.InputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.UnsupportedEncodingException;
+import org.openintents.openpgp.OpenPgpError;
+import org.openintents.openpgp.OpenPgpSignatureResult;
+import org.openintents.openpgp.util.OpenPgpApi;
+import org.openintents.openpgp.util.OpenPgpServiceConnection;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+import android.app.Activity;
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.app.FragmentTransaction;
+import android.app.PendingIntent;
+import android.content.IntentSender;
+import android.content.IntentSender.OnFinished;
+import android.content.IntentSender.SendIntentException;
+import android.os.Bundle;
+
+public class PgpConnect {
+	//OpenPgpServiceConnection mServiceConnection;
+	Activity act;
+	Context ctx;
+	Handler handler;
+	PgpFragment frag;
+
+	PgpConnect(Activity act) {
+		act = act;
+		ctx = act.getApplicationContext();
+		this.handler = new Handler(ctx.getMainLooper());
+		//this.mServiceConnection = new OpenPgpServiceConnection(ctx, "org.sufficientlysecure.keychain");
+		//this.mServiceConnection.bindToService();
+
+		final FragmentManager fm = act.getFragmentManager();
+		frag = new PgpFragment();
+		handler.post(new Runnable() {
+			public void run() {
+				FragmentTransaction ft = fm.beginTransaction();
+				ft.add(frag, "PgpFragment");
+				ft.commitNow();
+			}
+		});
+	}
+
+	public String Decrypt(byte[] dat, int chint) {
+		return frag.Decrypt(dat, chint);
+	}
+
+	public String Encrypt(byte[] id, byte[] dat, int chint) {
+		return frag.Encrypt(id, dat, chint);
+	}
+}

examples/pgp/PgpFragment.java

@@ -0,0 +1,170 @@
+package st.wow.git.pgp;
+
+import android.util.Log;
+import android.content.Context;
+import android.app.Fragment;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.io.InputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.StandardCharsets;
+import org.openintents.openpgp.OpenPgpError;
+import org.openintents.openpgp.OpenPgpSignatureResult;
+import org.openintents.openpgp.util.OpenPgpApi;
+import org.openintents.openpgp.util.OpenPgpServiceConnection;
+import android.content.Intent;
+import android.app.PendingIntent;
+import android.content.IntentSender;
+import android.content.IntentSender.SendIntentException;
+import android.os.Handler;
+
+public class PgpFragment extends Fragment {
+	OpenPgpServiceConnection mServiceConnection;
+	Context ctx;
+	Handler handler;
+
+	@Override public void onAttach(Context ctx) {
+		super.onAttach(ctx);
+		this.ctx = ctx;
+		this.handler = new Handler(ctx.getMainLooper());
+		Log.d("PgpFragment", "onAttach()");
+		mServiceConnection = new OpenPgpServiceConnection(ctx, "org.sufficientlysecure.keychain");
+		mServiceConnection.bindToService();
+	}
+
+	@Override public void onActivityResult(int requestCode, int resultCode, Intent data) {
+		Log.d("PgpFragment", "onActivityResult(" + requestCode + "): " + resultCode);
+		super.onActivityResult(requestCode, resultCode, data);
+		activityResult(requestCode, resultCode);
+	}
+
+	public String Decrypt(byte []dat, int chint) {
+		if (handler == null) {
+			return "";
+		}
+		final BlockingQueue<String> q = new LinkedBlockingQueue<String>();
+		handler.post(new Runnable() {
+			public void run() {
+				try {
+					q.put(_decrypt(dat, chint));
+				} catch (InterruptedException e) {
+					Log.e("gio", "InterruptedException", e);
+				}
+			}
+		});
+		try {
+			return q.take();
+		} catch (InterruptedException e) {
+			Log.e("gio", "InterruptedException", e);
+		}
+		return "";
+	}
+
+	private String _decrypt(byte []dat, int chint) {
+		String ret = "";
+		Intent data = new Intent();
+		data.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
+		InputStream is = new ByteArrayInputStream(dat);
+		ByteArrayOutputStream os = new ByteArrayOutputStream();
+		OpenPgpApi api = new OpenPgpApi(this.ctx, mServiceConnection.getService());
+		Intent result = api.executeApi(data, is, os);
+		switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
+			case OpenPgpApi.RESULT_CODE_SUCCESS: {
+				try {
+					ret = os.toString("UTF-8");
+					Log.d(OpenPgpApi.TAG, "output: " + ret);
+				} catch (UnsupportedEncodingException e) {
+					ret = "";
+					Log.e("gio", "UnsupportedEncodingException", e);
+				}
+				break;
+			}
+			case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED: {
+				PendingIntent pi = result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
+				try {
+					startIntentSenderForResult(pi.getIntentSender(), chint, null, 0, 0, 0, null);
+				} catch (IntentSender.SendIntentException e) {
+					Log.e("gio", "SendIntentException", e);
+				}
+				break;
+			}
+			case OpenPgpApi.RESULT_CODE_ERROR: {
+				OpenPgpError error = result.getParcelableExtra(OpenPgpApi.RESULT_ERROR);
+				break;
+			}
+		}
+		return ret;
+	}
+
+	public String Encrypt(byte[] id, byte[] dat, int chint) {
+		if (handler == null) {
+			return "";
+		}
+		final BlockingQueue<String> q = new LinkedBlockingQueue<String>();
+		handler.post(new Runnable() {
+			public void run() {
+				try {
+					q.put(_encrypt(id, dat, chint));
+				} catch (InterruptedException e) {
+					Log.e("gio", "InterruptedException", e);
+				}
+			}
+		});
+		try {
+			return q.take();
+		} catch (InterruptedException e) {
+			Log.e("gio", "InterruptedException", e);
+		}
+		return "";
+	}
+
+	private String _encrypt(byte[] id, byte[] dat, int chint) {
+		String ret = "";
+		Intent data = new Intent();
+		data.setAction(OpenPgpApi.ACTION_ENCRYPT);
+		data.putExtra(OpenPgpApi.EXTRA_USER_IDS, new String[]{new String(id)});
+		data.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
+		InputStream is = new ByteArrayInputStream(dat);
+		ByteArrayOutputStream os = new ByteArrayOutputStream();
+		OpenPgpApi api = new OpenPgpApi(this.ctx, mServiceConnection.getService());
+		Intent result = api.executeApi(data, is, os);
+		switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
+			case OpenPgpApi.RESULT_CODE_SUCCESS: {
+				try {
+					ret = os.toString("UTF-8");
+					Log.d(OpenPgpApi.TAG, "output: " + ret);
+				} catch (UnsupportedEncodingException e) {
+					Log.e("gio", "UnsupportedEncodingException", e);
+				}
+
+				if (result.hasExtra(OpenPgpApi.RESULT_SIGNATURE)) {
+					OpenPgpSignatureResult sigResult
+							= result.getParcelableExtra(OpenPgpApi.RESULT_SIGNATURE);
+				}
+				break;
+			}
+			case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED: {
+				PendingIntent pi = result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
+				try {
+					IntentSender sender = pi.getIntentSender();
+					Log.d("PgpConnect", "IntentSender:" + sender.toString());
+					startIntentSenderForResult(sender, chint, null, 0, 0, 0, null);
+				} catch (IntentSender.SendIntentException e) {
+					Log.e("gio", "SendIntentException", e);
+				}
+				break;
+			}
+			case OpenPgpApi.RESULT_CODE_ERROR: {
+				OpenPgpError error = result.getParcelableExtra(OpenPgpApi.RESULT_ERROR);
+				break;
+			}
+		}
+		return ret;
+	}
+
+	static private native void activityResult(int requestCode, int resultCode);
+	static private native void stringResult(int requestCode, String result);
+}

examples/pgp/jni_android.c

@@ -0,0 +1,143 @@
+
+#include <stdlib.h>
+#include <jni.h>
+#include <android/log.h>
+#include "jni_android.h"
+#include "_cgo_export.h"
+
+static jobject gClassLoader;
+static jmethodID gFindClassMethod;
+
+void
+SetLoader(JNIEnv* env, jobject context) {
+	jclass cclass = (*env)->GetObjectClass(env, context);
+	jmethodID gcl_id = (*env)->GetMethodID(env, cclass, "getClassLoader", "()Ljava/lang/ClassLoader;");
+	jobject loader = (*env)->CallObjectMethod(env, context, gcl_id);
+	gClassLoader = (*env)->NewGlobalRef(env, loader);
+	jclass lclass = (*env)->GetObjectClass(env, loader);
+	gFindClassMethod = (*env)->GetMethodID(env, lclass, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;");
+}
+
+jclass
+FindClass(JNIEnv* env, char* name) {
+	jstring strClassName = (*env)->NewStringUTF(env, name);
+	return (*env)->CallObjectMethod(env, gClassLoader, gFindClassMethod, strClassName);
+}
+
+jobject
+CreateObject(JNIEnv* env, jclass cls) {
+	jmethodID init = (*env)->GetMethodID(env, cls, "<init>", "()V");
+	return (*env)->NewObject(env, cls, init);
+}
+
+void
+AddFragment(JNIEnv* env, jobject act, jobject frag) {
+	jclass cls = (*env)->GetObjectClass(env, act);
+	jmethodID mid = (*env)->GetMethodID(env, cls, "getFragmentManager", "()Landroid/app/FragmentManager;");
+	jobject fm = (*env)->CallObjectMethod(env, act, mid);
+	cls = (*env)->GetObjectClass(env, fm);
+	mid = (*env)->GetMethodID(env, cls, "beginTransaction", "()Landroid/app/FragmentTransaction;");
+	jobject ft = (*env)->CallObjectMethod(env, fm, mid);
+	cls = (*env)->GetObjectClass(env, ft);
+	mid = (*env)->GetMethodID(env, cls, "add", "(Landroid/app/Fragment;)V");
+	(*env)->CallVoidMethod(env, ft, mid, frag);
+	mid = (*env)->GetMethodID(env, cls, "commitNow", "()V");
+	(*env)->CallVoidMethod(env, ft, mid);
+
+	cls = (*env)->GetObjectClass(env, frag);
+	static const JNINativeMethod fragMethods[] = {
+		{
+			.name = "activityResult",
+			.signature = "(II)V",
+			.fnPtr = activityResult
+		},
+		{
+			.name = "stringResult",
+			.signature = "(ILjava/lang/String;)V",
+			.fnPtr = stringResult
+		},
+	};
+
+	(*env)->RegisterNatives(env, cls, fragMethods, sizeof(fragMethods)/sizeof(fragMethods[0]));
+}
+
+jobject
+NewPgpConnect(JNIEnv* env, jobject act) {
+	jclass cls = FindClass(env, "st/wow/git/pgp/PgpConnect");
+	jmethodID init = (*env)->GetMethodID(env, cls, "<init>", "(Landroid/app/Activity;)V");
+	jobject ret = (*env)->NewObject(env, cls, init, act);
+
+	cls = FindClass(env, "st/wow/git/pgp/PgpFragment");
+	static const JNINativeMethod actMethods[] = {
+		{
+			.name = "activityResult",
+			.signature = "(II)V",
+			.fnPtr = activityResult
+		},
+		{
+			.name = "stringResult",
+			.signature = "(ILjava/lang/String;)V",
+			.fnPtr = stringResult
+		},
+	};
+
+	(*env)->RegisterNatives(env, cls, actMethods, sizeof(actMethods)/sizeof(actMethods[0]));
+
+	return (*env)->NewGlobalRef(env, ret);
+}
+
+const char*
+Decrypt(JNIEnv* env, jobject p, char* cdata, int datalen, int chint) {
+	jbyteArray data = (*env)->NewByteArray(env, datalen);
+	(*env)->SetByteArrayRegion(env, data, 0, datalen, cdata);
+	jclass cls = (*env)->GetObjectClass(env, p);
+	jmethodID mid = (*env)->GetMethodID(env, cls, "Decrypt", "([BI)Ljava/lang/String;");
+	jstring ret = (*env)->CallObjectMethod(env, p, mid, data, chint);
+	return (*env)->GetStringUTFChars(env, ret, NULL);
+}
+
+void stringResult(JNIEnv* env, jclass cls, jint requestCode, jobject response) {
+	char* str = (*env)->GetStringUTFChars(env, response, NULL);
+	goStringResult(env, cls, requestCode, str);
+}
+
+const char*
+Encrypt(JNIEnv* env, jobject p, char* cid, int idlen, char* cdata, int datalen, int chint) {
+	jbyteArray id = (*env)->NewByteArray(env, idlen);
+	(*env)->SetByteArrayRegion(env, id, 0, idlen, cid);
+	jbyteArray data = (*env)->NewByteArray(env, datalen);
+	(*env)->SetByteArrayRegion(env, data, 0, datalen, cdata);
+	jclass cls = (*env)->GetObjectClass(env, p);
+	jmethodID mid = (*env)->GetMethodID(env, cls, "Encrypt", "([B[BI)Ljava/lang/String;");
+	jstring ret = (*env)->CallObjectMethod(env, p, mid, id, data, chint);
+	return (*env)->GetStringUTFChars(env, ret, NULL);
+}
+
+void CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID) {
+	(*env)->CallVoidMethod(env, obj, methodID);
+}
+
+void CallVoidMethod1(JNIEnv *env, jobject obj, jmethodID methodID, jobject arg) {
+	(*env)->CallVoidMethod(env, obj, methodID, arg);
+}
+
+jint CallIntMethod(JNIEnv *env, jobject obj, jmethodID methodID) {
+	return (*env)->CallIntMethod(env, obj, methodID);
+}
+
+jmethodID GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
+	return (*env)->GetMethodID(env, clazz, name, sig);
+}
+
+jint GetEnv(JavaVM *vm, JNIEnv **env, jint version) {
+	return (*vm)->GetEnv(vm, (void **)env, version);
+}
+
+jint AttachCurrentThread(JavaVM *vm, JNIEnv **p_env, void *thr_args) {
+	return (*vm)->AttachCurrentThread(vm, p_env, thr_args);
+}
+
+jint DetachCurrentThread(JavaVM *vm) {
+	return (*vm)->DetachCurrentThread(vm);
+}
+

examples/pgp/jni_android.go

@@ -0,0 +1,158 @@
+package main
+
+/*
+#cgo LDFLAGS: -landroid
+
+#include <stdlib.h>
+#include "jni_android.h"
+*/
+import "C"
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"runtime"
+	"unsafe"
+	"sync"
+)
+
+var theJVM *C.JavaVM
+type JNIEnv = C.JNIEnv
+
+func SetJVM(jvm, context uintptr) {
+	log.Print("set theJVM")
+	theJVM = (*C.JavaVM)(unsafe.Pointer(jvm))
+	RunInJVM(func(env *C.JNIEnv) {
+		C.SetLoader(env, (C.jobject)(context))
+	})
+}
+
+func FindClass(env *C.JNIEnv, name string) C.jclass {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	return C.FindClass((*C.JNIEnv)(env), cname)
+}
+
+func AddFragment(env *C.JNIEnv, act C.jobject, frag C.jobject) {
+	C.AddFragment(env, act, frag);
+}
+
+func JniCallVoidMethod(env *C.JNIEnv, obj C.jobject, methodID C.jmethodID) {
+	C.CallVoidMethod(env, obj, methodID)
+}
+
+func JniCallVoidMethod1(env *C.JNIEnv, obj C.jobject, methodID C.jmethodID, arg uintptr) {
+	C.CallVoidMethod1(env, obj, methodID, C.jobject(unsafe.Pointer(arg)))
+}
+
+func JniCallIntMethod(env *C.JNIEnv, obj C.jobject, methodID C.jmethodID) int {
+	return (int)(C.CallIntMethod(env, obj, methodID))
+}
+
+func JniGetMethodID(env *C.JNIEnv, cls C.jclass, name, sig string) C.jmethodID {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	csig := C.CString(sig)
+	defer C.free(unsafe.Pointer(csig))
+	return C.GetMethodID(env, cls, cname, csig)
+}
+
+func CreateObject(env *C.JNIEnv, cls C.jclass) C.jobject {
+	return C.CreateObject(env, (C.jclass)(cls))
+}
+
+type PGP C.jobject
+
+func NewPgpConnect(env *C.JNIEnv, act uintptr) PGP {
+	return (PGP)(C.NewPgpConnect(env, (C.jobject)(unsafe.Pointer(act))))
+}
+
+var (
+	fragChans map[int]chan string
+	chmux sync.Mutex
+	chint int
+)
+
+func (p PGP) Decrypt(data string) string {
+	ch := make(chan string)
+	chmux.Lock()
+	if fragChans == nil {
+		fragChans = make(map[int]chan string)
+	}
+	fragChans[chint] = ch
+	curint := chint
+	chint++
+	chmux.Unlock()
+
+	cdata := C.CString(data)
+	defer C.free(unsafe.Pointer(cdata))
+	var ret string
+	RunInJVM(func(env *JNIEnv) {
+		retc := C.Decrypt(env, (C.jobject)(p), (*C.char)(unsafe.Pointer(cdata)), (C.int)(len(data)), C.int(curint))
+		defer C.free(unsafe.Pointer(retc))
+		ret = C.GoString(retc)
+	})
+	return ret
+}
+
+func (p PGP) Encrypt(id, data string) string {
+	ch := make(chan string)
+	chmux.Lock()
+	if fragChans == nil {
+		fragChans = make(map[int]chan string)
+	}
+	fragChans[chint] = ch
+	curint := chint
+	chint++
+	chmux.Unlock()
+
+	cid := C.CString(id)
+	defer C.free(unsafe.Pointer(cid))
+	cdata := C.CString(data)
+	defer C.free(unsafe.Pointer(cdata))
+	var ret string
+	RunInJVM(func(env *JNIEnv) {
+		retc := C.Encrypt(env, (C.jobject)(p), (*C.char)(unsafe.Pointer(cid)), (C.int)(len(id)), (*C.char)(unsafe.Pointer(cdata)), (C.int)(len(data)), C.int(curint))
+		defer C.free(unsafe.Pointer(retc))
+		ret = C.GoString(retc)
+	})
+	return ret
+}
+
+func RunInJVM(f func(env *C.JNIEnv)) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	var env *C.JNIEnv
+	var detach bool
+	if res := C.GetEnv(theJVM, &env, C.JNI_VERSION_1_6); res != C.JNI_OK {
+		if res != C.JNI_EDETACHED {
+			panic(fmt.Errorf("JNI GetEnv failed with error %d", res))
+		}
+		if C.AttachCurrentThread(theJVM, &env, nil) != C.JNI_OK {
+			panic(errors.New("runInJVM: AttachCurrentThread failed"))
+		}
+		detach = true
+	}
+
+	if detach {
+		defer func() {
+			C.DetachCurrentThread(theJVM)
+		}()
+	}
+	f(env)
+}
+
+//export activityResult
+func activityResult(env *C.JNIEnv, class C.jclass, request, result C.jint) {
+	log.Printf("activityResult (%d): %d", request, result)
+}
+
+//export goStringResult
+func goStringResult(env *C.JNIEnv, class C.jclass, request C.jint, str *C.char) {
+	fragChans[int(request)] <- C.GoString(str)
+	C.free(unsafe.Pointer(str))
+	chmux.Lock()
+	delete(fragChans, int(request))
+	chmux.Unlock()
+}

examples/pgp/jni_android.h

@@ -0,0 +1,17 @@
+#include <jni.h>
+
+void SetLoader(JNIEnv* env, jobject context);
+jclass FindClass(JNIEnv* env, char* name);
+jobject CreateObject(JNIEnv* env, jclass cls);
+void AddFragment(JNIEnv* env, jobject act, jobject frag);
+jobject NewPgpConnect(JNIEnv* env, jobject act);
+const char* Decrypt(JNIEnv* env, jobject p, char* cdata, int datalen, int chint);
+const char* Encrypt(JNIEnv* env, jobject p, char* cid, int idlen, char* cdata, int datalen, int chint);
+void stringResult(JNIEnv* env, jclass cls, jint requestCode, jobject response);
+void CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID);
+void CallVoidMethod1(JNIEnv *env, jobject obj, jmethodID methodID, jobject arg);
+jint CallIntMethod(JNIEnv *env, jobject obj, jmethodID methodID);
+jmethodID GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig);
+jint GetEnv(JavaVM *vm, JNIEnv **env, jint version);
+jint AttachCurrentThread(JavaVM *vm, JNIEnv **p_env, void *thr_args);
+jint DetachCurrentThread(JavaVM *vm);

examples/pgp/main.go

@@ -0,0 +1,79 @@
+// +build darwin linux
+
+package main
+
+import (
+	"log"
+
+	"gioui.org/app"
+	"gioui.org/io/system"
+	"gioui.org/layout"
+	"gioui.org/unit"
+	"gioui.org/widget/material"
+
+	"gioui.org/font/gofont"
+)
+
+var (
+	labchan chan string
+)
+
+func main() {
+	labchan = make(chan string)
+	log.Print("Staring event loop")
+	go eventloop()
+	app.Main()
+	log.Print("app.Main() returned")
+}
+
+func eventloop() {
+	gofont.Register()
+	w := app.NewWindow(
+		app.Size(unit.Dp(400), unit.Dp(400)),
+		app.Title("Hello"))
+	th := material.NewTheme()
+	gtx := &layout.Context{Queue: w.Queue()}
+
+	sysinset := &layout.Inset{}
+	margin := layout.UniformInset(unit.Dp(10))
+	labels := []material.Label{}
+	list := &layout.List{Axis: layout.Vertical}
+
+	resetSysinset := func(x system.Insets) {
+		sysinset.Top = x.Top
+		sysinset.Bottom = x.Bottom
+		sysinset.Left = x.Left
+		sysinset.Right = x.Right
+	}
+	go func() {
+		labchan <- "Starting"
+		callJni()
+	}()
+	for {
+		select {
+		case x := <-labchan:
+			labels = append(labels, th.Body1(x))
+			w.Invalidate()
+		case e := <-w.Events():
+			switch e := e.(type) {
+			case system.DestroyEvent:
+				return
+			case system.FrameEvent:
+				gtx.Reset(e.Config, e.Size)
+				resetSysinset(e.Insets)
+				sysinset.Layout(gtx, func() {
+					margin.Layout(gtx, func() {
+						list.Layout(gtx, len(labels), func(i int) {
+							labels[i].Layout(gtx)
+						})
+					})
+				})
+				e.Frame(gtx.Ops)
+			case system.StageEvent:
+				log.Printf("stage event -- %s", e.Stage)
+			case *system.CommandEvent:
+				log.Print("command event")
+			}
+		}
+	}
+}

examples/pgp/os_android.go

@@ -0,0 +1,56 @@
+//go:generate mkdir -p classes
+//go:generate javac -bootclasspath $ANDROID_HOME/platforms/android-29/android.jar -classpath openpgp-api.jar -d classes PgpConnect.java PgpFragment.java
+//go:generate jar cf PgpConnect.jar -C classes .
+//go:generate rm -rf classes
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"gioui.org/app"
+)
+
+var (
+	h *app.Handle
+	connected bool
+	pgp PGP
+)
+
+
+func connect() {
+	if !connected {
+		log.Print("PlatformHandle()")
+		h = app.PlatformHandle()
+		log.Print("SetJVM()")
+		SetJVM(h.JVM, h.Activity)
+		log.Print("SetJVM() returned")
+		RunInJVM(func(env *JNIEnv) {
+			log.Print("NewPgpConnect()")
+			pgp = NewPgpConnect(env, h.Activity)
+		})
+		connected = true
+	}
+}
+
+func checkPermission() bool {
+	connect()
+	//return pgp.CheckPermission(env)
+	return false
+}
+
+func callJni() {
+	connect()
+	labchan <- fmt.Sprintf("JVM = %d", h.JVM)
+	labchan <- fmt.Sprintf("Activity = %d", h.Activity)
+	time.Sleep(time.Second / 5)
+
+	val := pgp.Encrypt("greg_pomerantz@yahoo.com", "hi there")
+	//val := pgp.Encrypt("root@example.com", "hi there")
+	log.Print("val = ", val)
+	val2 := pgp.Decrypt(val)
+	labchan <- "result = " + val2
+}
+

examples/pgp/os_other.go

@@ -0,0 +1,7 @@
+// +build !android
+
+package main
+
+func callJni() {
+}
+