init

.gitignore

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+bin/
+gen/
+*.keystore

AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="org.er2.fireplace"
+  android:versionCode="1"
+  android:versionName="1.0"
+  >
+
+  <uses-sdk
+    android:minSdkVersion="19"
+    android:targetSdkVersion="32"
+    />
+
+  <!-- if want on TV:
+    android:banner="@drawable/banner"
+  -->
+  <application
+    android:icon="@drawable/icon"
+    android:label="Fireplace"
+    >
+    <activity android:hardwareAccelerated="true"
+      android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+      android:screenOrientation="landscape"
+      android:name=".MainActivity"
+      >
+
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+        <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+      </intent-filter>
+    </activity>
+
+    <service
+      android:name=".Dream"
+      android:exported="true"
+      android:permission="android.permission.BIND_DREAM_SERVICE"
+      >
+      <intent-filter>
+        <action android:name="android.service.dreams.DreamService" />
+        <category android:name="android.intent.category.DEFAULT" />
+      </intent-filter>
+    </service>
+  </application>
+
+</manifest>
+

Makefile

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+NAME = Fireplace
+PROJ = org.er2.fireplace
+
+ifeq ($TV,1)
+  SDK_VER = 24
+  SDK     = 24.0.3
+else
+  SDK_VER = 19
+  SDK     = 19.1.0
+endif
+
+SDK_ROOT = ~/Android/Sdk
+JAVA_HOME:=$(if $(JAVA_HOME),$(JAVA_HOME),/usr/lib/jvm/java-1.11.0-openjdk-amd64)
+
+VEDBASE = $(SDK_ROOT)/platforms/android-$(SDK_VER)/android.jar
+
+ADB  = $(SDK_ROOT)/platform-tools/adb
+AAPT = $(SDK_ROOT)/build-tools/$(SDK)/aapt
+DX   = $(SDK_ROOT)/build-tools/$(SDK)/dx
+ZIPALIGN=$(SDK_ROOT)/build-tools/$(SDK)/zipalign
+JAVAC     = $(JAVA_HOME)/bin/javac
+JARSIGNER = $(JAVA_HOME)/bin/jarsigner
+
+PWD=$(shell pwd)
+
+OUT=$(PWD)/bin
+GEN=$(PWD)/gen
+RES=$(PWD)/res
+SRC=$(PWD)/src
+#ASS=$(PWD)/assets
+
+SRCS=$(shell find $(SRC) -name '*.java')
+CLSS=$(SRCS:$(SRC)/%.java=$(GEN)/%.class)
+
+KEY_PATH ?= debug.keystore
+KEY_NAME ?= androiddebugkey
+KEY_PASS ?= android
+
+all: debug
+
+debug:
+	@$(MAKE) DEBUG=true -C $(PWD) build
+
+release:
+	@$(MAKE) -C $(PWD) build
+
+APK=$(OUT)/$(NAME).apk
+CDX=$(OUT)/classes.dex
+
+build: $(APK)
+$(APK): $(CDX) package sign zip
+	@if [ ! -f "$(APK)" ]; then mv $(OUT)/$(NAME).ap_ $(APK); fi
+	@$(RM) $(OUT)/$(NAME).ap_
+
+prepare: clean
+	@mkdir -p $(OUT) $(GEN)
+	@$(AAPT) > /dev/null 2>&1; if ! [ $$? -ne 0 ]; then echo YOU NEED TO install lib32stdc++6 lib32z1; exit 1; fi
+	@$(AAPT) p $(if $(DEBUG),--debug-mode,) -I $(VEDBASE) -fm -M $(PWD)/AndroidManifest.xml -J $(GEN) -S $(RES)
+
+$(CDX):
+#	dependencies is here to not re-build on every make
+	@make -C $(PWD) prepare $(CLSS)
+	@$(DX) --dex --output=$@ $(GEN)
+
+$(GEN)/%.class: $(SRC)/%.java
+	-@echo Recompiling $@
+	@$(JAVAC) $(if $(DEBUG),-g,) -classpath $(VEDBASE) -sourcepath 'src:$(GEN)' -d '$(GEN)' -target 1.7 -source 1.7 $<
+
+package: $(CDX) AndroidManifest.xml
+	@$(AAPT) p $(if $(DEBUG),--debug-mode,) -I $(VEDBASE) -f -M $(PWD)/AndroidManifest.xml -S $(RES) -F $(OUT)/$(NAME).ap_ # -A $(ASS)
+	@cd $(OUT) && $(AAPT) a $(NAME).ap_ classes.dex
+	
+sign: package $(KEY_PATH)
+	@$(JARSIGNER) -keystore $(KEY_PATH) -storepass '$(KEY_PASS)' $(OUT)/$(NAME).ap_ $(KEY_NAME)
+
+zip: package
+	@$(ZIPALIGN) -f 4 $(OUT)/$(NAME).ap_ $(APK)
+
+$(KEY_PATH):
+	@yes | keytool -genkey -v -keystore $(KEY_PATH) -storepass '$(KEY_PASS)' -alias $(KEY_NAME) -keypass $(KEY_PASS) -keyalg RSA -keysize 2048 -validity 10000
+
+clean:
+	@rm -rf $(OUT) $(GEN)
+
+run: $(OUT)/$(NAME).apk
+	-@$(ADB) uninstall $(PROJ)
+	@$(ADB) install $^
+	@$(ADB) shell monkey -p $(PROJ) -c android.intent.category.LAUNCHER 1
+

readme.org

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+* Fireplace
+
+This is a matrix-like fireplace for Android!
+
+It was written unoptimized, so it can be benchmark.
+
+Also you can compile it for TV
+and even use as screensaver!

res/layout/dream.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<FrameLayout
+  xmlns:android="http://schemas.android.com/apk/res/android"
+  android:layout_width="fill_parent"
+  android:layout_height="fill_parent"
+  >
+  <org.er2.fireplace.FireplaceView
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    />
+
+  <!-- Yes clock only for dream -->
+  <TextClock
+    android:textSize="32sp"
+    android:textColor="#fff"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:gravity="end"
+    android:layout_marginEnd="32dp"
+    android:layout_marginTop="32dp"
+    />
+</FrameLayout>
+

res/layout/main.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<org.er2.fireplace.FireplaceView
+  xmlns:android="http://schemas.android.com/apk/res/android"
+  android:layout_width="match_parent"
+  android:layout_height="match_parent"
+  />

src/org/er2/fireplace/Dream.java

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+package org.er2.fireplace;
+
+import android.service.dreams.DreamService;
+import android.widget.TextView;
+
+public class Dream extends DreamService {
+  @Override
+  public void onAttachedToWindow() {
+    super.onAttachedToWindow();
+    setInteractive(false);
+    setFullscreen(true);
+    setContentView(R.layout.dream);
+  }
+}

src/org/er2/fireplace/Fireplace.java

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+package org.er2.fireplace;
+
+import java.util.Random;
+import java.util.ArrayList;
+
+public class Fireplace {
+  private static String chr = "!\"#$%&*+,./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\\^_`~ ";
+  private static int[] cols = {
+    0xFFfdcf58,
+    0xFFf27d0c,
+    0xFFf07f13,
+    0xFF800909,
+  };
+
+  int fsize;
+  public int w, h, col;
+  ArrayList<Integer> fire;
+  Random rand;
+
+  int ind;
+  int cid;
+  int hid;
+
+  public Fireplace() {
+    fire = new ArrayList<Integer>();
+    rand = new Random();
+    ind = -1;
+    cid = 0;
+    hid = 0;
+    fire.add(0);
+  }
+
+  public void row() {
+    ind = -1;
+    next();
+  }
+  public void next() {
+    if(ind + 1 >= fire.size()) return;
+    ind++;
+    if(fire.get(ind) * fsize > h / 7
+    && rand.nextInt(6) == 2)
+      fire.set(ind, 0);
+    else fire.set(ind, fire.get(ind) + 1);
+    cid = rand.nextInt(cols.length);
+    hid = rand.nextInt(chr.length());
+  }
+  public int[] getXY() {
+    int[] c = new int[2];
+    c[0] = ind * fsize;
+    c[1] = h - fire.get(ind) * fsize;
+    return c;
+  }
+  public int getCol() {
+    return cols[cid];
+  }
+  public char getChr() {
+    return chr.charAt(hid);
+  }
+
+  public void setSize(int w, int h) {
+    this.w = w;
+    this.h = h;
+
+    fsize = Math.min(w, h) / 32;
+    col = w / fsize + 1;
+    for(int i = 0; i < col; i++)
+      if(i >= fire.size()) fire.add(0);
+  }
+}
+

src/org/er2/fireplace/FireplaceView.java

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+package org.er2.fireplace;
+
+import android.view.View;
+import android.graphics.Canvas;
+import android.graphics.Bitmap;
+import android.graphics.Paint;
+import android.content.Context;
+import android.util.AttributeSet;
+
+import android.util.Log;
+
+public class FireplaceView extends View {
+  Paint paint;
+  Fireplace fpl;
+  Bitmap bmp;
+
+  public FireplaceView(Context ctx, AttributeSet attrs) {
+    super(ctx, attrs);
+    paint = new Paint();
+    fpl = new Fireplace();
+    bmp = Bitmap.createBitmap(1, 1, Bitmap.Config.ALPHA_8);
+  }
+
+  public void drawFire(Canvas canv) {
+    canv.drawBitmap(bmp, 0, 0, null);
+    paint.setColor(0x1E000000);
+    canv.drawRect(0, 0, getWidth(), getHeight(), paint);
+    for(int i = 0; i < fpl.col; i++) {
+      fpl.next();
+      paint.setColor(fpl.getCol());
+      int[] xy = fpl.getXY();
+      canv.drawText("" + fpl.getChr(),
+        xy[0], xy[1], paint);
+    }
+    fpl.row();
+    //postInvalidateDelayed(60);
+    invalidate();
+  }
+
+  @Override
+  public void onDraw(Canvas c) {
+    Bitmap bip = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
+    Canvas canv = new Canvas(bip);
+    drawFire(canv);
+    bmp.recycle();
+    bmp = bip;
+    c.drawBitmap(bmp, 0, 0, null);
+  }
+  
+  @Override
+  protected void onSizeChanged(int w, int h, int ow, int oh) {
+    fpl.setSize(w, h);
+  }
+}
+

src/org/er2/fireplace/MainActivity.java

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+package org.er2.fireplace;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class MainActivity extends Activity {
+  @Override
+  public void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.main);
+  }
+}