Initial Commit

AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+ package="coffee.source.helloworld"
+ versionCode="0"
+ versionName="0">
+    <uses-sdk android:minSdkVersion="19"/>
+    <application android:label="Hello World">
+        <activity android:name=".HelloWorld">
+             <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+             </intent-filter>
+        </activity>
+    </application>
+</manifest>

Makefile

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+ANDROIDSDK=/usr/lib/android-sdk/build-tools/debian
+PLATFORM=/usr/lib/android-sdk/platforms/android-23/android.jar
+MINSDK=19
+APP=src/coffee/source/helloworld
+
+CLASSES=$(patsubst %.java,%.class,$(wildcard $(APP)/*.java))
+
+# Resources:
+# https://www.hanshq.net/command-line-android.html
+
+helloworld.apk: helloworld.aligned.apk keystore.jks
+	apksigner sign --ks keystore.jks --ks-key-alias androidkey --ks-pass pass:android --key-pass pass:android --out $@ $<
+
+keystore.jks:
+	keytool -genkeypair -keystore $@ -alias androidkey -validity 10000 -keyalg RSA -keysize 2048 -storepass android -keypass android
+
+helloworld.aligned.apk: helloworld.unsigned.apk
+	zipalign -f -p 4 $< $@
+
+helloworld.unsigned.apk: dex/classes.dex AndroidManifest.xml
+	aapt package -f -v -F $@ -I $(PLATFORM) -M AndroidManifest.xml -S res dex
+
+dex/classes.dex: $(CLASSES)
+	[ -e dex ] || mkdir dex
+	$(ANDROIDSDK)/dx --dex --verbose --min-sdk-version=$(MINSDK) --output=$@ src
+
+$(APP)/HelloWorld.class: $(APP)/*.java $(APP)/R.java
+	javac -bootclasspath $(PLATFORM) -classpath src -source 1.7 -target 1.7 $^
+
+$(APP)/R.java: AndroidManifest.xml res/*
+	aapt package -f -m -J src -S res -M AndroidManifest.xml -I $(PLATFORM)
+
+clean:
+	rm -vf	$(APP)/R.java \
+		$(APP)/*.class \
+		*.unsigned.apk \
+		*.aligned.apk \
+		dex/*.dex
+
+distclean: clean
+	[ ! -d dex ] || rmdir dex
+	rm -vf *.apk
+
+squeaky-clean: distclean
+	@echo 'Warning! This will remove your signing keys!'
+	@echo 'You have 5 seconds to press CTRL-C'
+	@sleep 5
+	rm -vf *.jks

res/layout/activity_main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center"
+    android:orientation="vertical">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:id="@+id/my_text"/>
+</LinearLayout>

src/coffee/source/helloworld/HelloWorld.java

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+package coffee.source.helloworld;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.TextView;
+
+public class HelloWorld extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        TextView text = (TextView)findViewById(R.id.my_text);
+        text.setText("Hello, world!");
+    }
+}