Calcs.java :  » Tools » engtools » com » BinarySheep » eTools » Android Open Source

package com.BinarySheep.eTools;

import java.text.DecimalFormat;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

public class Calcs extends Activity {
  
  private int calcMode =0;
  
  // Handles
  private Spinner mCalcMode = null;  
  private RelativeLayout mRow1 = null;
  private RelativeLayout mRow2 = null;
  private RelativeLayout mRow3 = null;  
  private TextView mLabel1 = null;
  private TextView mLabel2 = null;
  private TextView mLabel3 = null;
  private EditText mInput1 = null;
  private EditText mInput2 = null;
  private EditText mInput3 = null;
  private TextView mUnit1 = null;
  private TextView mUnit2 = null;
  private TextView mUnit3 = null;
  private TextView mResult = null;
  private ImageView mFormula = null;

  
  @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.calcs);
        
        // Get handles
        mCalcMode = (Spinner)findViewById(R.id.calcmode);
        mRow1 = (RelativeLayout)findViewById(R.id.row1);
        mRow2 = (RelativeLayout)findViewById(R.id.row2);
        mRow3 = (RelativeLayout)findViewById(R.id.row3);
        mLabel1 = (TextView)findViewById(R.id.label1);
        mLabel2 = (TextView)findViewById(R.id.label2);
        mLabel3 = (TextView)findViewById(R.id.label3);        
        mInput1 = (EditText)findViewById(R.id.input1);
        mInput2 = (EditText)findViewById(R.id.input2);
        mInput3 = (EditText)findViewById(R.id.input3);        
        mUnit1 = (TextView)findViewById(R.id.unit1);
        mUnit2 = (TextView)findViewById(R.id.unit2);
        mUnit3 = (TextView)findViewById(R.id.unit3);
        mResult = (TextView)findViewById(R.id.result);
        mFormula = (ImageView)findViewById(R.id.formula);
        
        // Attach handler to text inputs
        mInput1.setOnKeyListener(textInputHandler);
        mInput2.setOnKeyListener(textInputHandler);
        mInput3.setOnKeyListener(textInputHandler);
        
        // Populate mCalcMode spinner
        ArrayAdapter adapter = ArrayAdapter.createFromResource(
            this, R.array.calcmodes, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mCalcMode.setAdapter(adapter);
        mCalcMode.setOnItemSelectedListener(spnCalcModeListener);
  }  
  
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
      boolean result = super.onCreateOptionsMenu(menu);
      MenuInflater inflater = getMenuInflater();
      inflater.inflate(R.menu.menu_led, menu);
      return result;
    }
    
    public boolean onOptionsItemSelected(MenuItem item) {
      switch (item.getItemId()) {
      case R.id.tools:
        finish();
        return true;
      case R.id.about:
        showAbout();
        return true;
      case R.id.help:
        showHelp();
        return true;
      }
      return super.onOptionsItemSelected(item);
    }
    
    protected void showHelp() {
        View messageView = getLayoutInflater().inflate(R.layout.help_resistor, null, false);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.help_resistor_title);
        builder.setView(messageView);
        builder.setPositiveButton("Done", null);
        builder.create();
        builder.show();
    }
    
    protected void showAbout() {
        // Inflate the about message contents
        View messageView = getLayoutInflater().inflate(R.layout.about, null, false);
        
        // When linking text, force to always use default color. This works
        // around a pressed color state bug.
        TextView textView = (TextView) messageView.findViewById(R.id.about_credits);
        int defaultColor = textView.getTextColors().getDefaultColor();
        textView.setTextColor(defaultColor);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setIcon(R.drawable.icon);
        builder.setTitle(R.string.app_name_short);
        builder.setView(messageView);
        builder.setPositiveButton("Done", null);
        builder.create();
        builder.show();
    }
  
    // Input TextView handler
    private View.OnKeyListener textInputHandler =
      new View.OnKeyListener() {
      public boolean onKey(View v, int keyCode, KeyEvent event) {
        switch(calcMode) {
        case 0:
          calc_LED();
          break;        
        case 1:
          calc_InductReact();
          break;        
        case 2:
          calc_CapReact();
          break;        
        }        
      return false;
      }
    };
    
    // mCalcMode Spinner handler
  private Spinner.OnItemSelectedListener spnCalcModeListener =
    new Spinner.OnItemSelectedListener() {
    public void onItemSelected(AdapterView parent, View v, int position, long id) {
      // Update UI based on selected spinner item      
      calcMode = parent.getSelectedItemPosition();
      switch(calcMode) {
      case 0:
        calcUI_LED();
        break;
      case 1:
        calcUI_InductReact();
        break;
      case 2:
        calcUI_CapReact();
        break;
      }
    }
    public void onNothingSelected(AdapterView parent) { }
  };
    
  // LED/Resistor calc UI
  private void calcUI_LED() {
    // Row1: Source Voltage (V)
    mRow1.setVisibility(View.VISIBLE);
    mLabel1.setText("Source Voltage:");
    mUnit1.setText("V");
    
    // Row2: Diode Forward Voltage (V) 
    mRow2.setVisibility(View.VISIBLE);    
    mLabel2.setText("Forward Voltage:");
    mUnit2.setText("V");
    
    // Row3: Diode Forward Current (mA)
    mRow3.setVisibility(View.VISIBLE);    
    mLabel3.setText("Forward Current:");
    mUnit3.setText("mA");
    
    // Formula Image
    mFormula.setImageResource(R.drawable.form1);
    
    // Do first calc
    calc_LED();
  }
  
  // LED/Resistor Calculator
  private void calc_LED() {    
    double Vsrc;
    double Vdiode;
    double Idiode;
    
    // Conversion
    try {
      Vsrc = Double.parseDouble(mInput1.getText().toString());
      Vdiode = Double.parseDouble(mInput2.getText().toString());
      Idiode = Double.parseDouble(mInput3.getText().toString());
      // Idiode is in mA
      Idiode *= 0.001;
    } catch (NumberFormatException e) {
      mResult.setText("invalid");
      return;
    }
    
    // Input tests
    if (Vdiode > Vsrc) {
      mResult.setText("Vdiode > Vsrc");
      return;
    }

    // Calculation: R = (Vsrc - Vdiode) / Idiode 
    double result = (Vsrc - Vdiode) / Idiode;
    
    // Result
    DecimalFormat df = new DecimalFormat("0.0");
    mResult.setText("R = " + df.format(result) + "\u2126");
  }

  // Inductive Reactance calc UI
  private void calcUI_InductReact() {
    // Row1: Frequency (f-Hz)
    mRow1.setVisibility(View.VISIBLE);
    mLabel1.setText("Frequency:");
    mUnit1.setText("f-Hz");
    
    // Row2: Inductance (L-mH)
    mRow2.setVisibility(View.VISIBLE);    
    mLabel2.setText("Inductance:");
    mUnit2.setText("L-mH");

    // Row3: Hidden
    mRow3.setVisibility(View.GONE);    

    // Formula Image
    mFormula.setImageResource(R.drawable.form2);
    
    // Do first calc
    calc_InductReact();
  }
  
  // Inductive Reactance Calculator
  private void calc_InductReact() {    
    double freq;
    double induct;
    
    // Conversion
    try {
      freq = Double.parseDouble(mInput1.getText().toString());
      induct = Double.parseDouble(mInput2.getText().toString());
      // Inductance is in mH
      induct *= 0.001;
    } catch (NumberFormatException e) {
      mResult.setText("invalid");
      return;
    }

    // Calculation: X = 2 * pi * f * I
    double result = 2 * Math.PI * freq * induct;
    
    // Result
    DecimalFormat df = new DecimalFormat("0.00");
    mResult.setText(df.format(result) + "\u2126");
  }
  
  // Capacitive Reactance calc UI
  private void calcUI_CapReact() {
    // Row1: Frequency (f-Hz)
    mRow1.setVisibility(View.VISIBLE);
    mLabel1.setText("Frequency:");
    mUnit1.setText("f-Hz");
    
    // Row2: Inductance (L-mH)
    mRow2.setVisibility(View.VISIBLE);    
    mLabel2.setText("Capacitance:");
    mUnit2.setText("C-\u00B5F");

    // Row3: Hidden
    mRow3.setVisibility(View.GONE);
    
    // Formula Image
    mFormula.setImageResource(R.drawable.form3);
    
    // Do first calc
    calc_CapReact();
  }
  
  // Capacitive Reactance Calculator
  private void calc_CapReact() {    
    double freq;
    double cap;
    
    // Conversion
    try {
      freq = Double.parseDouble(mInput1.getText().toString());
      cap = Double.parseDouble(mInput2.getText().toString());
      // Capacitance is in uF
      cap *= 0.000001;
    } catch (NumberFormatException e) {
      mResult.setText("invalid");
      return;
    }

    // Calculation: X = 1 / ( 2 * pi * f * C )
    double result = 1 / (2 * Math.PI * freq * cap);
    
    // Result
    DecimalFormat df = new DecimalFormat("0.00");
    mResult.setText(df.format(result) + "\u2126");
  }
  
}