Android Open Source - MathApp Activity Arithmetic

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Back to project page MathApp.

License

The source code is released under:

MIT License

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Java Source Code

package ie.lc.mathApp;
/*from w  w w.  j a  va2 s .c o  m*/
import ie.lc.R;
import android.os.Bundle;
import android.view.Menu;
import android.widget.*;





public class ActivityArithmetic extends ActivityGameBase
{
  private Operator gameOperator;
  private double   gameOperandLeft;
  private double   gameOperandRight;
  
  
  
  
  
  protected void onSaveInstanceState( Bundle out ) {
    super.onSaveInstanceState( out );
    out.putSerializable( "gameOperator",     gameOperator     );
    out.putDouble      ( "gameOperandLeft",  gameOperandLeft  );
    out.putDouble      ( "gameOperandRight", gameOperandRight );
  }
  
  
  
  
  
  protected void onRestoreInstanceState( Bundle in ) {
    super.onRestoreInstanceState( in );
    gameOperator     = (Operator) in.getSerializable( "gameOperator"     );
    gameOperandLeft  =            in.getDouble      ( "gameOperandLeft"  );
    gameOperandRight =            in.getDouble      ( "gameOperandRight" );
    updateUI();
  }
  
  
  
  
  
  protected void onCreate( Bundle savedInstanceState ) {
    super.onCreate( savedInstanceState, R.layout.activity_arithmetic );
  }
  
  
  
  
  
  protected void setupGameActions() {
    setupAnswerActions(
      R.id.arithFieldAnswer,
      R.id.arithButtAnswer
    );
  }
  
  
  
  
  
  protected void setupNavActions() {
    setupNavActions(
      R.id.arithButtWave,  ActivityWave.class,
      R.id.arithButtSqrt,  ActivitySqrt.class
    );
  }
  
  
  
  
  
  protected void updateUI() {
    EditText fieldOpLeft  = (EditText) findViewById( R.id.arithFieldOperandLeft  );
    EditText fieldOpRight = (EditText) findViewById( R.id.arithFieldOperandRight );
    TextView textOperator = (TextView) findViewById( R.id.arithTextOperator      );
    EditText fieldAnswer  = (EditText) findViewById( R.id.arithFieldAnswer       );
    
    fieldOpLeft .setText( "" + (int) gameOperandLeft  );
    fieldOpRight.setText( "" + (int) gameOperandRight );
    textOperator.setText( "" +       gameOperator     );
    fieldAnswer .setText( "" );
  }
  
  
  
  
  
  protected void gameReset() {    
    gameOperandLeft  = Util.randomIntRange( 1, 10 );
    gameOperandRight = Util.randomIntRange( 1, 10 );
    gameOperator     = Operator.random();
    
    if (gameOperator == Operator.divide) // Keep it simple
      gameOperandLeft = gameOperandRight * Util.randomIntRange( 2, 10 );
    
    updateUI();
  }
  
  
  
  
  
  protected boolean isAnswerCorrect() {
    try {
      EditText fieldAnswer = (EditText) findViewById( R.id.arithFieldAnswer );
      double   userAnswer  = Double.parseDouble( fieldAnswer.getText().toString() );
      double   rightAnswer = gameOperator.evaluate( gameOperandLeft, gameOperandRight );
      return (userAnswer == rightAnswer);
    }
    catch (NumberFormatException ex) {
      return false;
    }
  }
}

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