Android Open Source - humiditytracker Take Reading Activity

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Back to project page humiditytracker.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
This file is part of leafdigital Humidity tracker.
/*  w  w w .j av a2 s  .  c  o  m*/
Humidity tracker is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Humidity tracker is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Humidity tracker. If not, see <http://www.gnu.org/licenses/>.

Copyright 2010 Samuel Marshall.
*/
package com.leafdigital.humidity;

import android.app.Activity;
import android.content.*;
import android.os.Bundle;
import android.text.*;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

import static com.leafdigital.humidity.HumidityActivity.*;

public class TakeReadingActivity extends Activity
{
  private final static String DECIMAL_REGEX = "[0-9]+(\\.[0-9]+)?";

  private final static String PREFS_TEMP_ERROR = "tempError",
    PREFS_HUMIDITY_ERROR = "humidityError";

  private Button ok;
  private EditText tempEdit, humidityEdit, tempErrorEdit, humidityErrorEdit;

  /**
   * Rounds a value for display. This rounds to two decimal places, but then
   * discards the decimal places if not used, so that it can display results
   * of the form 0.97, 0.9, and 0.
   * @param value Value
   * @return String
   */
  private static String roundValue(float value)
  {
    String s = String.format("%.2f", value);
    while(s.endsWith("0"))
    {
      s = s.substring(0, s.length() - 1);
    }
    if(s.endsWith("."))
    {
      s = s.substring(0, s.length() - 1);
    }
    return s;
  }

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.takereading);

    ok = (Button)findViewById(R.id.ok);
    tempEdit = (EditText)findViewById(R.id.temp);
    tempErrorEdit = (EditText)findViewById(R.id.temperror);
    humidityEdit = (EditText)findViewById(R.id.humidity);
    humidityErrorEdit = (EditText)findViewById(R.id.humidityerror);

    // Set default error values
    SharedPreferences prefs = getSharedPreferences("com.leafdigital.humidity",MODE_PRIVATE);
    tempErrorEdit.setText(roundValue(prefs.getFloat(PREFS_TEMP_ERROR, 1.0f)));
    humidityErrorEdit.setText(roundValue(prefs.getFloat(PREFS_HUMIDITY_ERROR, 4.0f)));

    TextWatcher watcher = new TextWatcher()
    {
      @Override
      public void afterTextChanged(Editable arg0)
      {
        textChanged();
      }

      @Override
      public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
        int arg3)
      {
      }

      @Override
      public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
      {
      }
    };
    tempEdit.addTextChangedListener(watcher);
    tempErrorEdit.addTextChangedListener(watcher);
    humidityEdit.addTextChangedListener(watcher);
    humidityErrorEdit.addTextChangedListener(watcher);

    ok.setOnClickListener(new OnClickListener()
    {
      @Override
      public void onClick(View v)
      {
        // User has entered a reading
        double temp = Double.parseDouble(tempEdit.getText().toString());
        double humidity = Double.parseDouble(humidityEdit.getText().toString());

        float tempError = Float.parseFloat(tempErrorEdit.getText().toString());
        float humidityError = Float.parseFloat(humidityErrorEdit.getText().toString());

        // Update preferences to track the error
        SharedPreferences prefs = getSharedPreferences("com.leafdigital.humidity",MODE_PRIVATE);
        if(prefs.getFloat(PREFS_TEMP_ERROR, 1.0f) != tempError
          || prefs.getFloat(PREFS_HUMIDITY_ERROR, 1.0f) != humidityError)
        {
          SharedPreferences.Editor editor = prefs.edit();
          editor.putFloat(PREFS_TEMP_ERROR, tempError);
          editor.putFloat(PREFS_HUMIDITY_ERROR, humidityError);
          editor.commit();
        }

        Intent intent = new Intent(TakeReadingActivity.this, ShowReadingActivity.class);
        intent.putExtra(EXTRA_TEMP, temp);
        intent.putExtra(EXTRA_TEMP_ERROR, tempError);
        intent.putExtra(EXTRA_HUMIDITY, humidity);
        intent.putExtra(EXTRA_HUMIDITY_ERROR, humidityError);

        startActivityForResult(intent, 0);
      }
    });
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data)
  {
    // Pass result data through, and finish
    if(resultCode == RESULT_OK)
    {
      setResult(resultCode, data);
      finish();
    }
  }

  private void textChanged()
  {
    String tempString = tempEdit.getText().toString();
    String tempErrorString = tempErrorEdit.getText().toString();
    String humidityString = humidityEdit.getText().toString();
    String humidityErrorString = humidityErrorEdit.getText().toString();
    ok.setEnabled(
      tempString.matches(DECIMAL_REGEX)
      && tempErrorString.matches(DECIMAL_REGEX)
      && humidityString.matches(DECIMAL_REGEX)
      && humidityErrorString.matches(DECIMAL_REGEX)
      && Double.parseDouble(tempString) <= 40.0
      && Double.parseDouble(tempErrorString) <= 10.0
      && Double.parseDouble(humidityString) <= 100.0
      && Double.parseDouble(humidityString) >= 1.0
      && Double.parseDouble(humidityErrorString) <= 10.0);
  }
}

Java Source Code List

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