new example native activity

examples/native-activity/README.md

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+# NativeActivity
+
+Ported from https://github.com/android/ndk-samples/tree/main/native-activity .
+
+This example demonstrates the use of native_app_glue and android_main.
+
+## std.log override
+
+```zig
+_ = c.__android_log_write(priority, "ZIG", &buf.buffer);
+```
+
+You can display the logs filtered by "ZIG" in color by following the steps below.
+
+```
+$ adb logcat -s "ZIG" -v color
+```

examples/native-activity/android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:tools="http://schemas.android.com/tools"
+  package="com.zig.native_activity">
+
+  <application
+    android:icon="@mipmap/ic_launcher"
+    android:label="@string/app_name"
+    android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+    android:hasCode="false"
+    tools:targetApi="31">
+    <activity
+      android:name="android.app.NativeActivity"
+      android:exported="true"
+      android:label="@string/app_name">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>

examples/native-activity/android/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Pretty name of your app -->
+    <string name="app_name">Zig NativeActivity</string>
+    <!-- 
+    This is required for the APK name. This identifies your app, Android will associate
+    your signing key with this identifier and will prevent updates if the key changes.
+    -->
+    <string name="package_name">com.zig.native_activity</string>
+</resources>

examples/native-activity/build.zig

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+const std = @import("std");
+const builtin = @import("builtin");
+const android = @import("android");
+
+pub fn build(b: *std.Build) void {
+
+    // const target = b.standardTargetOptions(.{});
+    const target = b.resolveTargetQuery(.{
+        .cpu_arch = .aarch64,
+        .os_tag = .linux,
+        .abi = .android,
+    });
+    const optimize = b.standardOptimizeOption(.{});
+
+    const android_sdk = android.Sdk.create(b, .{});
+    const apk = android_sdk.createApk(.{
+        .api_level = .android15,
+        .build_tools_version = "35.0.1",
+        .ndk_version = "29.0.13113456",
+    });
+    const key_store_file = android_sdk.createKeyStore(.example);
+    apk.setKeyStore(key_store_file);
+    apk.setAndroidManifest(b.path("android/AndroidManifest.xml"));
+    apk.addResourceDirectory(b.path("android/res"));
+
+    const exe = b.addSharedLibrary(.{
+        .name = "native-activity",
+        .target = target,
+        .optimize = optimize,
+        .root_source_file = b.path("src/main.zig"),
+        .link_libc = true,
+    });
+    b.installArtifact(exe);
+
+    exe.addIncludePath(.{ .cwd_relative = b.fmt("{s}/sources/android/native_app_glue", .{apk.ndk.path}) });
+    exe.addCSourceFile(.{
+        .file = .{ .cwd_relative = b.fmt("{s}/sources/android/native_app_glue/android_native_app_glue.c", .{apk.ndk.path}) },
+    });
+    exe.addCSourceFile(.{
+        .file = b.path("src/helper.cpp"),
+    });
+    // exe.target_link_options(${TARGET_NAME} PUBLIC -u ANativeActivity_onCreate)
+    const libs = [_][]const u8{
+        "android",
+        "EGL",
+        "GLESv1_CM",
+        "log",
+    };
+    for (libs) |lib| {
+        exe.linkSystemLibrary(lib);
+    }
+
+    const android_dep = b.dependency("android", .{
+        .optimize = optimize,
+        .target = target,
+    });
+    exe.root_module.addImport("android", android_dep.module("android"));
+
+    apk.addArtifact(exe);
+
+    const installed_apk = apk.addInstallApk();
+    b.getInstallStep().dependOn(&installed_apk.step);
+
+    const run_step = b.step("run", "Install and run the application on an Android device");
+    const adb_install = android_sdk.addAdbInstall(installed_apk.source);
+    const adb_start = android_sdk.addAdbStart("com.zig.native_activity/android.app.NativeActivity");
+    adb_start.step.dependOn(&adb_install.step);
+    run_step.dependOn(&adb_start.step);
+}

examples/native-activity/build.zig.zon

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+.{
+    .name = .native_activity,
+    .version = "0.0.0",
+    .fingerprint = 0xe31e7fb5499884f3, // Changing this has security and trust implications.
+    .minimum_zig_version = "0.14.1",
+    .dependencies = .{
+        .android = .{ .path = "../.." },
+    },
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "src",
+    },
+}

examples/native-activity/src/c.zig

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+pub usingnamespace @cImport({
+    @cInclude("EGL/egl.h");
+    @cInclude("GLES/gl.h");
+    @cInclude("android/choreographer.h");
+    @cInclude("android/log.h");
+    @cInclude("android/sensor.h");
+    @cInclude("android/set_abort_message.h");
+    @cInclude("android_native_app_glue.h");
+    // #include <jni.h>
+});

examples/native-activity/src/helper.cpp

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+#include <android_native_app_glue.h>
+#include <android/sensor.h>
+
+extern "C" {
+
+void call_souce_process(android_app *state, android_poll_source *s) {
+  s->process(state, s);
+}
+
+const float* get_acceleration(const ASensorEvent *event)
+{
+  return &event->acceleration.x;
+}
+
+}