Implement counter app

emidoots · Jan 10, 2023 · 9324dee · 9324dee
1 parent b09c072
commit 9324dee
Show file tree

Hide file tree

Showing 2 changed files with 22 additions and 8 deletions.
diff --git a/examples/invocationhandler/main.zig b/examples/invocationhandler/main.zig
@@ -16,16 +16,33 @@ comptime {
     _ = @import("root").log;
 }
 
-pub fn timerInvoke(_: ?*anyopaque, jni: android.jni.JNI, method: android.jobject, args: android.jobjectArray) android.jobject {
+const ButtonData = struct {
+    count: usize = 0,
+};
+
+pub fn timerInvoke(data: ?*anyopaque, jni: android.jni.JNI, method: android.jobject, args: android.jobjectArray) android.jobject {
+    var btn_data = @ptrCast(*ButtonData, @alignCast(@alignOf(*ButtonData), data));
+    btn_data.count += 1;
     std.log.info("Running invoke!", .{});
-    _ = method;
+    const method_name = android.jni.JNI.String.init(jni, jni.callObjectMethod(method, "getName", "()Ljava/lang/String;", .{}));
+    defer method_name.deinit(jni);
+    std.log.info("Method {}", .{std.unicode.fmtUtf16le(method_name.slice)});
+
     const length = jni.invokeJni(.GetArrayLength, .{args});
     var i: i32 = 0;
     while (i < length) : (i += 1) {
         const object = jni.invokeJni(.GetObjectArrayElement, .{ args, i });
         const string = android.jni.JNI.String.init(jni, jni.callObjectMethod(object, "toString", "()Ljava/lang/String;", .{}));
         defer string.deinit(jni);
         std.log.info("Arg {}: {}", .{ i, std.unicode.fmtUtf16le(string.slice) });
+
+        if (i == 0) {
+            const Button = jni.findClass("android/widget/Button");
+            const setText = jni.invokeJni(.GetMethodID, .{ Button, "setText", "(Ljava/lang/CharSequence;)V" });
+            var buf: [256:0]u8 = undefined;
+            const str = std.fmt.bufPrintZ(&buf, "Pressed {} times!", .{btn_data.count}) catch "formatting bug";
+            jni.invokeJni(.CallVoidMethod, .{ object, setText, jni.newString(str) });
+        }
     }
 
     return null;
@@ -53,6 +70,8 @@ pub const AndroidApp = struct {
     uiThreadLooper: *android.ALooper = undefined,
     uiThreadId: std.Thread.Id = undefined,
 
+    btn_data: ButtonData = .{},
+
     pub fn init(allocator: std.mem.Allocator, activity: *android.ANativeActivity, stored_state: ?[]const u8) !AndroidApp {
         _ = stored_state;
 
@@ -241,7 +260,7 @@ pub const AndroidApp = struct {
         self.invocation_handler = NativeInvocationHandler.init(jni, class);
 
         // Create a TimerTask invoker
-        const invocation_handler = try self.invocation_handler.createAlloc(jni, self.allocator, null, &timerInvoke);
+        const invocation_handler = try self.invocation_handler.createAlloc(jni, self.allocator, &self.btn_data, &timerInvoke);
 
         std.log.info("Creating Interface array", .{});
         const interface_array = jni.invokeJni(.NewObjectArray, .{

diff --git a/src/native-invocation-handler.zig b/src/native-invocation-handler.zig
@@ -6,11 +6,6 @@ class: android.jobject,
 initFn: android.jmethodID,
 
 pub fn init(jni: android.jni.JNI, class: android.jobject) Self {
-    // const native_invocation_handler_buffer = @embedFile("NativeInvocationHandler.dex");
-    // TODO: define class is not implemented on android
-    // const NativeInvocationHandler = jni.invokeJni(.DefineClass, .{ "NativeInvocationHandler", class_loader, @ptrCast([*]const i8, &native_invocation_handler_buffer), native_invocation_handler_buffer.len });
-    // const NativeInvocationHandler = jni.findClass("NativeInvocationHandler");
-    // const NativeInvocationHandler = jni.findClass("net/random_projects/zig_android_template/NativeInvocationHandler");
     const methods = [_]android.JNINativeMethod{
         .{
             .name = "invoke0",