Android Open Source - interdroid-swan New Math Expression Dialog

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License

The source code is released under:

Copyright (c) 2008-2011 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

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Java Source Code

package interdroid.swan.ui;
//from w ww  .ja va2s.  com
import interdroid.swan.R;
import interdroid.swan.swansong.Expression;
import interdroid.swan.swansong.ExpressionFactory;
import interdroid.swan.swansong.ExpressionParseException;
import interdroid.swan.swansong.HistoryReductionMode;
import interdroid.swan.swansong.MathOperator;
import interdroid.swan.swansong.MathValueExpression;
import interdroid.swan.swansong.ValueExpression;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class NewMathExpressionDialog extends Activity {

  public static final int LEFT = 1;
  public static final int RIGHT = 2;
  public static final int OPERATOR = 3;

  boolean leftActive = false;
  boolean rightActive = false;
  boolean operatorActive = false;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setResult(RESULT_CANCELED);

    setContentView(R.layout.expression_builder_new_math_dialog);

    findViewById(R.id.left).setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View v) {
        startActivityForResult(new Intent(getApplicationContext(),
            SelectTypedValueDialog.class), LEFT);
      }
    });

    findViewById(R.id.right).setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View v) {
        startActivityForResult(new Intent(getApplicationContext(),
            SelectTypedValueDialog.class), RIGHT);
      }
    });

    findViewById(R.id.operator).setOnClickListener(
        new View.OnClickListener() {

          @Override
          public void onClick(View v) {
            startActivityForResult(new Intent(
                getApplicationContext(),
                SelectOperatorDialog.class), OPERATOR);
          }
        });

    findViewById(R.id.ok).setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View v) {
        // check whether we have a left and a right
        // value and an operator, create a new
        // comparator expression out of it, then add
        // it to the list of expressions.
        try {
          Expression left = ExpressionFactory
              .parse(((Button) findViewById(R.id.left)).getText()
                  .toString());
          Expression right = ExpressionFactory
              .parse(((Button) findViewById(R.id.right))
                  .getText().toString());
          MathOperator operator = MathOperator
              .parse(((Button) findViewById(R.id.operator))
                  .getText().toString());
          // TODO get a configurable history reduction mode instead of
          // default
          Expression newExpression = new MathValueExpression(
              Expression.LOCATION_SELF, (ValueExpression) left,
              operator, (ValueExpression) right,
              HistoryReductionMode.DEFAULT_MODE);
          Intent result = new Intent();
          result.putExtra("Expression", newExpression.toParseString());
          // if (name != null && !name.equals("")) {
          // result.putExtra("name", name);
          // }
          setResult(RESULT_OK, result);
          finish();
        } catch (ExpressionParseException e) {
          // TODO: improve this
          Toast.makeText(getApplicationContext(), "Failed!",
              Toast.LENGTH_LONG).show();
        }

      }
    });

  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
      switch (requestCode) {
      case LEFT:
        ((Button) findViewById(R.id.left)).setText(data
            .getStringExtra("Expression"));
        leftActive = true;
        break;
      case RIGHT:
        ((Button) findViewById(R.id.right)).setText(data
            .getStringExtra("Expression"));
        rightActive = true;
        break;
      case OPERATOR:
        ((Button) findViewById(R.id.operator)).setText(data
            .getStringExtra("Operator"));
        operatorActive = true;
        break;
      default:
        break;
      }
      findViewById(R.id.ok).setEnabled(
          leftActive && rightActive && operatorActive);
    }
  }

}

Java Source Code List