🚧 Add 4 Grid Sudoku and support level selection

Now we have 4 and 9 Sudoku avaliable and also support level selection for 9

Author: HUSTERGS

SudokuApp-GS/Sudoku/app/src/main/AndroidManifest.xml

@@ -9,7 +9,9 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".SudokuNine"></activity>
+        <activity android:name=".ChooseLevel"></activity>
+        <activity android:name=".SudokuFour" />
+        <activity android:name=".SudokuNine" />
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

SudokuApp-GS/Sudoku/app/src/main/java/com/example/sudoku/ChooseLevel.java

@@ -0,0 +1,67 @@
+package com.example.sudoku;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.media.Image;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+
+public class ChooseLevel extends AppCompatActivity {
+
+    private int i = 0;
+
+    private void disableButtons() {
+        LinearLayout easy = (LinearLayout) findViewById(R.id.easylevel);
+        LinearLayout medium = (LinearLayout) findViewById(R.id.mediumlevel);
+        LinearLayout hard = (LinearLayout) findViewById(R.id.hardlevel);
+        LinearLayout devil = (LinearLayout) findViewById(R.id.devil_level);
+        easy.setClickable(false);
+        easy.setFocusable(false);
+        medium.setClickable(false);
+        medium.setFocusable(false);
+        hard.setClickable(false);
+        hard.setFocusable(false);
+        devil.setClickable(false);
+        devil.setFocusable(false);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_choose_level);
+        LinearLayout easy = findViewById(R.id.easylevel);
+        LinearLayout medium = findViewById(R.id.mediumlevel);
+        LinearLayout hard = findViewById(R.id.hardlevel);
+        LinearLayout devil = findViewById(R.id.devil_level);
+
+        LinearLayout[] layouts = new LinearLayout[]{easy, medium, hard, devil};
+        for (; i < layouts.length; i++) {
+            final int value = i * 10 + 20;
+            layouts[i].setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    disableButtons();
+                    Intent intent = new Intent(ChooseLevel.this, SudokuNine.class);
+                    intent.putExtra("level", value);
+                    startActivity(intent);
+                }
+            });
+            LinearLayout subLinear = (LinearLayout) layouts[i].getChildAt(1);
+            for (int t = 0; t < subLinear.getChildCount(); t++) {
+                ImageButton imageButton = (ImageButton) subLinear.getChildAt(t);
+                imageButton.setOnClickListener(new View.OnClickListener() {
+                    @Override
+                    public void onClick(View v) {
+                        disableButtons();
+                        Intent intent = new Intent(ChooseLevel.this, SudokuNine.class);
+                        intent.putExtra("level", value);
+                        startActivity(intent);
+                    }
+                });
+            }
+        }
+    }
+}

SudokuApp-GS/Sudoku/app/src/main/java/com/example/sudoku/MainActivity.java

@@ -20,7 +20,8 @@ protected void onCreate(Bundle savedInstanceState) {
         startTextView.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                Intent intent = new Intent(MainActivity.this, SudokuNine.class);
+                Intent intent = new Intent(MainActivity.this, ChooseLevel.class);
+//                intent.putExtra("level", 10);
                 startActivity(intent);
             }
         });