WingLoadCalculatorActivity.java :  » App » skydiveapp-4-android » org » skydiveapp » Android Open Source

package org.skydiveapp;

import java.text.MessageFormat;

import org.skydiveapp.util.CalculatorType;
import org.skydiveapp.repository.SettingsRepository;
import org.skydiveapp.data.WeightUnit;
import org.skydiveapp.ui.CalculatorTypeAdapter;
import org.skydiveapp.ui.FormatUtility;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;

public class WingLoadCalculatorActivity extends Activity
{
  // data
  private float result = 0;
  
  // settings repository
  private SettingsRepository settingsRepo = new SettingsRepository(this);
  
  // listeners
  private OnClickListener cancelClickListener = new OnClickListener()
  {
    @Override
    public void onClick(View view)
    {
      finish();
    }
  };
  private OnItemSelectedListener typeSelectedListener = new OnItemSelectedListener()
  {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
    {
      updateUI();
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent)
    {
      updateUI();
    }
  };
  private TextWatcher textChangeListener = new TextWatcher()
  {
    @Override
    public void onTextChanged(CharSequence text, int arg1, int arg2, int arg3)
    {
      // recalculate
      calculate();
    }
    
    @Override
    public void beforeTextChanged(CharSequence text, int arg1, int arg2,
        int arg3)
    {
    }
    
    @Override
    public void afterTextChanged(Editable editable)
    {
    }
  };
  
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    
    // initialize UI
    initUI();
    
    // update UI
    updateUI();
  }
  
  private void initUI()
  {
    // show view
    setContentView(R.layout.wing_load_calculator);
    
    // set cancel button text
    Button cancelButton = (Button)findViewById(R.id.EditHeaderCancelButton);
    cancelButton.setOnClickListener(cancelClickListener);
    cancelButton.setText(R.string.back_button);
    
    // hide save button
    Button saveButton = (Button)findViewById(R.id.EditHeaderSaveButton);
    saveButton.setVisibility(View.GONE);
    
    // set header
    TextView headerTextView = (TextView)findViewById(R.id.EditHeaderTextView);
    headerTextView.setText(R.string.wing_load_calculator_label);
    
    // load type spinner
    Spinner typeSpinner = (Spinner)findViewById(R.id.WingLoadCalculateTypeSpinner);
    typeSpinner.setAdapter(new CalculatorTypeAdapter(this));
    typeSpinner.setOnItemSelectedListener(typeSelectedListener);
    
    // get weight unit
    WeightUnit weightUnit = settingsRepo.getSettings().getWeightUnit();
    
    // set labels
    TextView yourWeightLabel = (TextView)findViewById(R.id.WingLoadYourWeightLabel);
    yourWeightLabel.setText(getString(R.string.wing_load_your_weight_label));
    
    TextView equipWeightLabel = (TextView)findViewById(R.id.WingLoadEquipmentWeightLabel);
    equipWeightLabel.setText(getString(R.string.wing_load_rig_weight_label));

    // add text change listeners
    EditText yourWeightField = (EditText)findViewById(R.id.WingLoadYourWeightField);
    yourWeightField.setHint(weightUnit.getResourceId());
    yourWeightField.addTextChangedListener(textChangeListener);
    
    EditText equipWeightField = (EditText)findViewById(R.id.WingLoadEquipmentWeightField);
    equipWeightField.setHint(weightUnit.getResourceId());
    equipWeightField.addTextChangedListener(textChangeListener);
    
    EditText canopySizeField = (EditText)findViewById(R.id.WingLoadCanopySizeField);
    canopySizeField.addTextChangedListener(textChangeListener);
    
    EditText wingLoadingField = (EditText)findViewById(R.id.WingLoadDesiredWingLoadingField);
    wingLoadingField.addTextChangedListener(textChangeListener);
  }
  
  private void updateUI()
  {
    // get fields
    Spinner typeSpinner = (Spinner)findViewById(R.id.WingLoadCalculateTypeSpinner);
    TableRow canopySizeRow = (TableRow)findViewById(R.id.WingLoadCanopySizeRow);
    TableRow wingLoadRow = (TableRow)findViewById(R.id.WingLoadDesiredWingLoadingRow);

    // get calculator type
    CalculatorType type = (CalculatorType)typeSpinner.getSelectedItem();
    
    // update based on selected type
    if (type == CalculatorType.WingLoading)
    {
      canopySizeRow.setVisibility(View.VISIBLE);
      wingLoadRow.setVisibility(View.GONE);
    }
    else if (type == CalculatorType.CanopySize)
    {
      canopySizeRow.setVisibility(View.GONE);
      wingLoadRow.setVisibility(View.VISIBLE);
    }
    else if (type == CalculatorType.ExtraWeight)
    {
      canopySizeRow.setVisibility(View.VISIBLE);
      wingLoadRow.setVisibility(View.VISIBLE);
    }
    
    // recalculate
    calculate();
  }
  
  private void calculate()
  {
    // get fields
    Spinner typeSpinner = (Spinner)findViewById(R.id.WingLoadCalculateTypeSpinner);
    EditText yourWeightField = (EditText)findViewById(R.id.WingLoadYourWeightField);
    EditText equipWeightField = (EditText)findViewById(R.id.WingLoadEquipmentWeightField);
    EditText canopySizeField = (EditText)findViewById(R.id.WingLoadCanopySizeField);
    EditText wingLoadingField = (EditText)findViewById(R.id.WingLoadDesiredWingLoadingField);
    TextView resultTextView = (TextView)findViewById(R.id.WingLoadResultField);

    // get calculator type
    CalculatorType type = (CalculatorType)typeSpinner.getSelectedItem();
    
    // get values
    float yourWeight = getValue(yourWeightField);    
    float equipWeight = getValue(equipWeightField);
    float canopySizeSqFt = getValue(canopySizeField);
    float wingLoadLbsSqFt = getValue(wingLoadingField);
    
    // get preferred metrics
    WeightUnit weightUnit = settingsRepo.getSettings().getWeightUnit();

    // calculate result
    this.result = CalculatorType.calculate(
        type,
        yourWeight, equipWeight, weightUnit,
        canopySizeSqFt, wingLoadLbsSqFt);
    
    // get result label format
    String resultStrFormat = getString(R.string.wing_load_result_format);
    String resultUnit = "";
    if (type == CalculatorType.WingLoading)
    {
      resultUnit = getString(R.string.wing_load_unit);
    }
    else if (type == CalculatorType.CanopySize)
    {
      resultUnit = getString(R.string.area_unit_square_feet);
    }
    else if (type == CalculatorType.ExtraWeight)
    {
      resultUnit = getString(weightUnit.getResourceId());
    }
    
    // set result
    resultTextView.setText(MessageFormat.format(resultStrFormat,
        FormatUtility.toNumericString(result),
        resultUnit));
  }
  
  private float getValue(TextView textView)
  {
    String text = textView.getText().toString();
    
    if (FormatUtility.isEmptyOrNull(text))
    {
      return 0;
    }
    
    return new Float(text);
  }
}