build, test, doc: Temporarily remove Android-related stuff

Previously, our Android builds were geared towards generating APKs,
which relied on Qt. However, after migrating to C++20, compiling for
Android became unfeasible due to Qt 5.15's compatibility limitations
with NDK only up to r25, which includes an outdated embedded libc++.

All removed stuff will be reinstated after migrating the build system to
CMake and upgrading Qt to version 6.x."

12 files changed, 0 insertions, 139 deletions

diff --git a/src/qt/android/.gitignore b/src/qt/android/.gitignore
deleted file mode 100644
index c090a2e98e..0000000000
--- a/src/qt/android/.gitignore
+++ /dev/null
@@ -1,7 +0,0 @@
-/.gradle
-/build
-/gradle
-/gradlew*
-/libs
-/src/org/kde
-/src/org/qtproject
diff --git a/src/qt/android/AndroidManifest.xml b/src/qt/android/AndroidManifest.xml
deleted file mode 100644
index 41615294e0..0000000000
--- a/src/qt/android/AndroidManifest.xml
+++ /dev/null
@@ -1,39 +0,0 @@
-<?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"/>
-            <meta-data android:name="android.app.load_local_libs_resource_id" android:resource="@array/load_local_libs"/>
-        </activity>
-
-    </application>
-</manifest>
diff --git a/src/qt/android/build.gradle b/src/qt/android/build.gradle
deleted file mode 100644
index 4c36e79db8..0000000000
--- a/src/qt/android/build.gradle
+++ /dev/null
@@ -1,52 +0,0 @@
-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
-    }
-}
diff --git a/src/qt/android/gradle.properties b/src/qt/android/gradle.properties
deleted file mode 100644
index 468f4757c0..0000000000
--- a/src/qt/android/gradle.properties
+++ /dev/null
@@ -1,4 +0,0 @@
-androidBuildToolsVersion=30.0.3
-androidCompileSdkVersion=30
-qt5AndroidDir=new File(".").absolutePath
-org.gradle.jvmargs=-Xmx4608M
diff --git a/src/qt/android/res/drawable-hdpi/bitcoin.png b/src/qt/android/res/drawable-hdpi/bitcoin.png
deleted file mode 100644
index 31a556a35f..0000000000
--- a/src/qt/android/res/drawable-hdpi/bitcoin.png
+++ /dev/null
diff --git a/src/qt/android/res/drawable-ldpi/bitcoin.png b/src/qt/android/res/drawable-ldpi/bitcoin.png
deleted file mode 100644
index 76d80d4196..0000000000
--- a/src/qt/android/res/drawable-ldpi/bitcoin.png
+++ /dev/null
diff --git a/src/qt/android/res/drawable-mdpi/bitcoin.png b/src/qt/android/res/drawable-mdpi/bitcoin.png
deleted file mode 100644
index c2aeab851a..0000000000
--- a/src/qt/android/res/drawable-mdpi/bitcoin.png
+++ /dev/null
diff --git a/src/qt/android/res/drawable-xhdpi/bitcoin.png b/src/qt/android/res/drawable-xhdpi/bitcoin.png
deleted file mode 100644
index 2bd5e3defc..0000000000
--- a/src/qt/android/res/drawable-xhdpi/bitcoin.png
+++ /dev/null
diff --git a/src/qt/android/res/drawable-xxhdpi/bitcoin.png b/src/qt/android/res/drawable-xxhdpi/bitcoin.png
deleted file mode 100644
index d236cf2132..0000000000
--- a/src/qt/android/res/drawable-xxhdpi/bitcoin.png
+++ /dev/null
diff --git a/src/qt/android/res/drawable-xxxhdpi/bitcoin.png b/src/qt/android/res/drawable-xxxhdpi/bitcoin.png
deleted file mode 100644
index bb1dbc3554..0000000000
--- a/src/qt/android/res/drawable-xxxhdpi/bitcoin.png
+++ /dev/null
diff --git a/src/qt/android/res/values/libs.xml b/src/qt/android/res/values/libs.xml
deleted file mode 100644
index b4b77b1c7b..0000000000
--- a/src/qt/android/res/values/libs.xml
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <array name="load_local_libs">
-        <item>
-            arm64-v8a;libbitcoin-qt_arm64-v8a.so
-        </item>
-        <item>
-            armeabi-v7a;libbitcoin-qt_armeabi-v7a.so
-        </item>
-        <item>
-            x86_64;libbitcoin-qt_x86_64.so
-        </item>
-    </array>
-</resources>
diff --git a/src/qt/android/src/org/bitcoincore/qt/BitcoinQtActivity.java b/src/qt/android/src/org/bitcoincore/qt/BitcoinQtActivity.java
deleted file mode 100644
index 2cba489242..0000000000
--- a/src/qt/android/src/org/bitcoincore/qt/BitcoinQtActivity.java
+++ /dev/null
@@ -1,23 +0,0 @@
-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();
-        }
-
-        super.onCreate(savedInstanceState);
-    }
-}