update with comments

added readme

README.md

@@ -0,0 +1,7 @@
+# ExamCodes
+Example codes
+
+
+## Unit
+
+[Download APK here](https://github.com/Vaek/ExamCodes/blob/master/Unit/app-debug.apk)

Unit/app/src/main/java/cz/vaek/unit/MainActivity.java

@@ -1,15 +1,21 @@
 package cz.vaek.unit;
 
+import android.os.AsyncTask;
 import android.support.annotation.StringRes;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
+import android.widget.Button;
 import android.widget.TextView;
 
 /**
- * Exam code.
+ * <h1>Storyous exam code</h1>
  *
- * Find mistake :-D
+ * <p>Find mistake(s) :-D</p>
+ * <p>Checkout on Github:
+ * <a href="https://github.com/Vaek/ExamCodes/tree/master/Unit">here</a></p>
+ * <p>or Download app:
+ * <a href="https://github.com/Vaek/ExamCodes/raw/master/Unit/app-debug.apk">here</a></p>
  */
 public class MainActivity extends AppCompatActivity {
 
@@ -27,19 +33,61 @@ public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
+        this.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         repaintCubeValue();
     }
 
+    /**
+     * Call when click on button in layout.
+     * @param view  Button in layout.
+     */
     public void cubeThrow(View view) {
-        mLastCubeValue += (int) (Math.random() * 6.1);
-        repaintCubeValue();
+        new CubeValueGenerator().execute();
+    }
+
+    /**
+     * Enable button to throw.
+     * @param enabled   {@link Boolean#TRUE} if button is enabled, {@link Boolean#FALSE} otherwise.
+     */
+    private void enableButton(boolean enabled) {
+        Button button = (Button) findViewById(R.id.button);
+        button.setEnabled(enabled);
     }
 
+    /**
+     * Repaint value of cube in {@link TextView} with id {@link cz.vaek.unit.R.id#text}.
+     * @param mLastCubeValue  Last value of cube.
+     */
     private void repaintCubeValue() {
         TextView textView = (TextView) findViewById(R.id.text);
         textView.setText(CUBE_VALUES[mLastCubeValue]);
     }
 
+    private class CubeValueGenerator extends AsyncTask<Object, Object, Integer> {
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            enableButton(false);
+        }
+
+        @Override
+        protected Integer doInBackground(Object... params) {
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            return (int) (Math.random() * 6.1);
+        }
+
+        @Override
+        protected void onPostExecute(Integer cubeValue) {
+            super.onPostExecute(cubeValue);
+            mLastCubeValue += cubeValue;
+            repaintCubeValue();
+            enableButton(true);
+        }
+    }
+
 }

Unit/gradle.properties

@@ -15,4 +15,6 @@
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
+# org.gradle.parallel=true
+
+com.android.build.gradle.overridePathCheck=true