Whac Mole

MainActivity

package com.yojiokisoft.whacmole.app;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;


public class MainActivity extends ActionBarActivity {
    private Button[][] mButton = new Button[5][4]; // [行][列]

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mButton[0][0] = (Button) findViewById(R.id.Button1A);
        mButton[0][1] = (Button) findViewById(R.id.Button1B);
        mButton[0][2] = (Button) findViewById(R.id.Button1C);
        mButton[0][3] = (Button) findViewById(R.id.Button1D);

        mButton[1][0] = (Button) findViewById(R.id.Button2A);
        mButton[1][1] = (Button) findViewById(R.id.Button2B);
        mButton[1][2] = (Button) findViewById(R.id.Button2C);
        mButton[1][3] = (Button) findViewById(R.id.Button2D);

        mButton[2][0] = (Button) findViewById(R.id.Button3A);
        mButton[2][1] = (Button) findViewById(R.id.Button3B);
        mButton[2][2] = (Button) findViewById(R.id.Button3C);
        mButton[2][3] = (Button) findViewById(R.id.Button3D);

        mButton[3][0] = (Button) findViewById(R.id.Button4A);
        mButton[3][1] = (Button) findViewById(R.id.Button4B);
        mButton[3][2] = (Button) findViewById(R.id.Button4C);
        mButton[3][3] = (Button) findViewById(R.id.Button4D);

        mButton[4][0] = (Button) findViewById(R.id.Button5A);
        mButton[4][1] = (Button) findViewById(R.id.Button5B);
        mButton[4][2] = (Button) findViewById(R.id.Button5C);
        mButton[4][3] = (Button) findViewById(R.id.Button5D);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    protected void onResume() {
        super.onResume();
        printMole();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void printMole() {
        int row = (int) (Math.random() * 5);
        int col = (int) (Math.random() * 4);
        mButton[row][col].setBackgroundResource(R.drawable.mole);
    }
}