Merge #17227: Qt: Add Android packaging support

246774e26459cb3652e308880abdd140e8e9d204 depends: fix Qt precompiled headers bug (Igor Cota)
8e7ad4146d55f472e3d1dacaabb6b7dee704a896 depends: disable Qt Vulkan support on Android (Igor Cota)
ba46adaa1abd51798394b5bad3799021adc237d2 CI: add Android APK build to cirrus (Igor Cota)
7563720e30a3052b7ee390f1b3d2874856fd073a CI: add Android APK build script (Igor Cota)
ebfb10cb75adb704418d08197681c1e742e63bd5 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 246774e26459cb3652e308880abdd140e8e9d204

Tree-SHA512: ba30a746576a167545223c35a51ae60bb0838818779fc152c210f5af1413961b2a6ab6af520ff92cbc8dcd5dcb663e81ca960f021218430c1f76397ed4cead6c

1 files changed, 14 insertions, 0 deletions

diff --git a/src/Makefile.qt.include b/src/Makefile.qt.include
index 59cfdb9839..399a8430ef 100644
--- a/src/Makefile.qt.include
+++ b/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)