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Simple hello world activity

src/com/celer/hello/Main.java

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+/* Copyright CelerSMS, 2020
+ * https://www.celersms.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package com.celer.hello;
+
+import android.os.Bundle;
+import android.app.Activity;
+import android.graphics.Color;
+import android.view.*;
+import android.widget.*;
+
+// A "Hello World" activity
+public final class Main extends Activity{
+
+   @Override
+   public final void onCreate(Bundle bb){
+      super.onCreate(bb);
+
+      // Create a simple vertical layout, add an image and a static text:
+      LinearLayout vertLayOut = new LinearLayout(this);
+      vertLayOut.setOrientation(LinearLayout.VERTICAL);
+      vertLayOut.setGravity(Gravity.CENTER_HORIZONTAL);
+      vertLayOut.setBackgroundColor(Color.BLACK);
+      vertLayOut.setLayoutParams(
+         new LinearLayout.LayoutParams(
+            ViewGroup.LayoutParams.FILL_PARENT,
+            ViewGroup.LayoutParams.FILL_PARENT
+         )
+      );
+      ImageView logo = new ImageView(this);
+      logo.setPadding(20, 20, 20, 20);
+      logo.setImageResource(R.mipmap.icon);
+      vertLayOut.addView(logo);
+      TextView txt = new TextView(this);
+      txt.setPadding(20, 20, 20, 20);
+      txt.setTextColor(Color.WHITE);
+      txt.setText("Hello World!");
+      txt.setGravity(Gravity.CENTER_HORIZONTAL);
+      vertLayOut.addView(txt);
+      setContentView(vertLayOut);
+   }
+}