Merge #17227: Qt: Add Android packaging support

246774e264 depends: fix Qt precompiled headers bug (Igor Cota)
8e7ad4146d depends: disable Qt Vulkan support on Android (Igor Cota)
ba46adaa1a CI: add Android APK build to cirrus (Igor Cota)
7563720e30 CI: add Android APK build script (Igor Cota)
ebfb10cb75 Qt: add Android packaging support (Igor Cota)

Pull request description:

  ![bitcoin-qt](https://user-images.githubusercontent.com/762502/67396157-62f3d000-f5a7-11e9-8a6f-9425823fcd6c.gif)
  This PR is the third and final piece of the basic Android support puzzle - it depends on https://github.com/bitcoin/bitcoin/pull/16110 and is related to https://github.com/bitcoin/bitcoin/pull/16883. It introduces an `android` directory under `qt` and a simple way to build an Android package of `bitcoin-qt`:

  1. Build depends for Android as described in the [README](https://github.com/bitcoin/bitcoin/blob/master/depends/README.md)
  2. Configure with one of the resulting prefixes
  3. Run `make && make apk` in `src/qt`

  The resulting APK files will be in `android/build/outputs/apk`. You can install them manually or with [adb](https://developer.android.com/studio/command-line/adb). One can also open the `android` directory in Android Studio for that integrated development and debugging experience. `BitcoinQtActivity` is your starting point.

  Under the hood makefile `apk` target:

  1. Renames the `bitcoin-qt` binary to `libbitcoin-qt.so` and copies it over to a folder under `android/libs` depending on which prefix and corresponding [ABI](https://developer.android.com/ndk/guides/abis.html#sa) `bitcoin-qt` was built for
  2. Takes `libc++_shared.so` from the Android NDK and puts in the same place. It [must be included](https://developer.android.com/ndk/guides/cpp-support) in the APK
  3. Extracts Qt for Android Java support files from the `qtbase` archive in `depends/sources` to `android/src`

  There is also just a tiny bit of `ifdef`'d code to make the Qt Widgets menus usable. It's not pretty but it works and is a stepping stone towards https://github.com/bitcoin/bitcoin/pull/16883.

ACKs for top commit:
  MarcoFalke:
    cr ACK 246774e264
  laanwj:
    Code review ACK 246774e264

Tree-SHA512: ba30a746576a167545223c35a51ae60bb0838818779fc152c210f5af1413961b2a6ab6af520ff92cbc8dcd5dcb663e81ca960f021218430c1f76397ed4cead6c

src/Makefile.qt.include

@@ -378,6 +378,20 @@ bitcoin_qt_clean: FORCE
 
 bitcoin_qt : qt/bitcoin-qt$(EXEEXT)
 
+APK_LIB_DIR = qt/android/libs/$(ANDROID_ARCH)
+QT_BASE_PATH = $(shell find ../depends/sources/ -maxdepth 1 -type f -regex ".*qtbase.*\.tar.xz")
+QT_BASE_TLD = $(shell tar tf $(QT_BASE_PATH) --exclude='*/*')
+
+bitcoin_qt_apk: FORCE
+	mkdir -p $(APK_LIB_DIR)
+	cp $(dir $(CC))../sysroot/usr/lib/$(host_alias)/libc++_shared.so $(APK_LIB_DIR)
+	tar xf $(QT_BASE_PATH) -C qt/android/src/ $(QT_BASE_TLD)src/android/jar/src --strip-components=5
+	tar xf $(QT_BASE_PATH) -C qt/android/src/ $(QT_BASE_TLD)src/android/java/src --strip-components=5
+	tar xf $(QT_BASE_PATH) -C qt/android/res/ $(QT_BASE_TLD)src/android/java/res --strip-components=5
+	cp qt/bitcoin-qt $(APK_LIB_DIR)/libbitcoin-qt.so
+	cd qt/android && gradle wrapper --gradle-version=6.6.1
+	cd qt/android && ./gradlew build
+
 ui_%.h: %.ui
 	@test -f $(UIC)
 	@$(MKDIR_P) $(@D)

src/qt/Makefile

@@ -7,3 +7,5 @@ check: FORCE
 	$(MAKE) -C .. test_bitcoin_qt_check
 bitcoin-qt bitcoin-qt.exe: FORCE
 	 $(MAKE) -C .. bitcoin_qt
+apk: FORCE
+	$(MAKE) -C .. bitcoin_qt_apk

src/qt/android/AndroidManifest.xml

@@ -0,0 +1,38 @@
+<?xml version='1.0' encoding='utf-8'?>
+<manifest package="org.bitcoincore.qt" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="1.0" android:versionCode="1" android:installLocation="auto">
+    <uses-sdk android:targetSdkVersion="24"/>
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <uses-feature android:glEsVersion="0x00020000" android:required="true" />
+
+    <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
+
+    <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="Bitcoin Core">
+        <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density"
+                  android:name="org.bitcoincore.qt.BitcoinQtActivity"
+                  android:label="Bitcoin Core"
+                  android:icon="@drawable/bitcoin"
+                  android:screenOrientation="unspecified"
+                  android:launchMode="singleTop">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+
+            <meta-data android:name="android.app.arguments" android:value="-testnet"/>
+            <meta-data android:name="android.app.lib_name" android:value="bitcoin-qt"/>
+            <meta-data android:name="android.app.repository" android:value="default"/>
+            <meta-data android:name="android.app.bundle_local_qt_libs" android:value="1"/>
+            <meta-data android:name="android.app.use_local_qt_libs" android:value="1"/>
+            <meta-data android:name="android.app.libs_prefix" android:value="/data/local/tmp/qt/"/>
+            <meta-data android:name="android.app.system_libs_prefix" android:value="/system/lib/"/>
+            <meta-data android:name="android.app.background_running" android:value="true"/>
+            <meta-data android:name="android.app.auto_screen_scale_factor" android:value="true"/>
+            <meta-data android:name="android.app.extract_android_style" android:value="default"/>
+    </activity>
+
+    </application>
+</manifest>

src/qt/android/build.gradle

@@ -0,0 +1,52 @@
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.1.0'
+    }
+}
+
+repositories {
+    google()
+    jcenter()
+}
+
+apply plugin: 'com.android.application'
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+}
+
+android {
+    compileSdkVersion androidCompileSdkVersion.toInteger()
+
+    buildToolsVersion androidBuildToolsVersion
+
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = [qt5AndroidDir + '/src', 'src', 'java']
+            aidl.srcDirs = [qt5AndroidDir + '/src', 'src', 'aidl']
+            res.srcDirs = [qt5AndroidDir + '/res', 'res']
+            resources.srcDirs = ['src']
+            renderscript.srcDirs = ['src']
+            assets.srcDirs = ['assets']
+            jniLibs.srcDirs = ['libs']
+       }
+    }
+
+    lintOptions {
+        abortOnError false
+    }
+
+    dexOptions {
+        javaMaxHeapSize '4g'
+    }
+
+    defaultConfig {
+        minSdkVersion 24
+    }
+}

src/qt/android/gradle.properties

@@ -0,0 +1,4 @@
+androidBuildToolsVersion=28.0.3
+androidCompileSdkVersion=28
+qt5AndroidDir=new File(".").absolutePath
+org.gradle.jvmargs=-Xmx4608M

src/qt/android/src/org/bitcoincore/qt/BitcoinQtActivity.java

@@ -0,0 +1,29 @@
+package org.bitcoincore.qt;
+
+import android.os.Bundle;
+import android.system.ErrnoException;
+import android.system.Os;
+
+import org.qtproject.qt5.android.bindings.QtActivity;
+
+import java.io.File;
+
+public class BitcoinQtActivity extends QtActivity
+{
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        final File bitcoinDir = new File(getFilesDir().getAbsolutePath() + "/.bitcoin");
+        if (!bitcoinDir.exists()) {
+            bitcoinDir.mkdir();
+        }
+
+        try {
+            Os.setenv("QT_QPA_PLATFORM", "android", true);
+        } catch (ErrnoException e) {
+            e.printStackTrace();
+        }
+
+        super.onCreate(savedInstanceState);
+    }
+}

src/qt/bitcoin.cpp

@@ -466,6 +466,12 @@ int GuiMain(int argc, char* argv[])
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
+#if defined(QT_QPA_PLATFORM_ANDROID)
+    QApplication::setAttribute(Qt::AA_DontUseNativeMenuBar);
+    QApplication::setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
+    QApplication::setAttribute(Qt::AA_DontUseNativeDialogs);
+#endif
+
     BitcoinApplication app;
     QFontDatabase::addApplicationFont(":/fonts/monospace");