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Main Activity of the Countdown Math Game for the SSaurel's Channel
package com.ssaurel.countdowngame;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.ssaurel.countdowngame.operations.Add;
import com.ssaurel.countdowngame.operations.Divide;
import com.ssaurel.countdowngame.operations.Multiply;
import com.ssaurel.countdowngame.operations.Operation;
import com.ssaurel.countdowngame.operations.Subtract;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private static final Operation[] OPERATIONS = {new Add(), new Subtract(), new Divide(), new Multiply()};
private ArrayList<String> solution = new ArrayList<>();
private EditText numbers, target;
private Button solve;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
numbers = (EditText) findViewById(R.id.numbers);
target = (EditText) findViewById(R.id.target);
solve = (Button) findViewById(R.id.solve);
solve.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String str = numbers.getText().toString();
String[] tmp = str.split(" ");
int[] numbers = new int[tmp.length];
for (int i = 0; i < tmp.length; i++) {
numbers[i] = Integer.parseInt(tmp[i]);
}
int total = Integer.parseInt(target.getText().toString());
solution.clear();
if (findSolution(numbers, numbers.length, total)) {
printSolution();
} else {
new AlertDialog.Builder(MainActivity.this).setTitle("Solution").
setMessage("Sorry, no solution").
show();
}
}
});
}
public boolean findSolution(int[] t, int nb, int total) {
for (int i = 0; i < nb; i++) {
if (t[i] == total) {
return true;
}
for (int j = i + 1; j < nb; j++) {
for (int k = 0; k < OPERATIONS.length; k++) {
int res = OPERATIONS[k].eval(t[i], t[j]);
if (res != 0) {
int savei = t[i], savej = t[j];
t[i] = res;
t[j] = t[nb - 1];
if (findSolution(t, nb - 1, total)) {
solution.add(Math.max(savei, savej) + " " +
OPERATIONS[k].symbol() + " " +
Math.min(savei, savej) + " = " + res);
return true;
}
t[i] = savei;
t[j] = savej;
}
}
}
}
return false;
}
public void printSolution() {
StringBuilder builder = new StringBuilder();
for (int i = solution.size() - 1; i >= 0; i--) {
builder.append(solution.get(i)).append("\n");
}
new AlertDialog.Builder(this).setTitle("Solution").
setMessage(builder.toString()).
show();
}
}
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