Simple Zakat Calculator

This is a simple Zakat Calculator that do some calculation.

Provided in the source is the Java source. It contains sample code on how to ;

• alert user is input is null
• handle calculation
• show OK dialog box
• numerical value parse from string
• invoke sharing intent
• admob, etc

Screen shots

The complete source - https://docs.google.com/file/d/0B34ZxOOoeSDdeURRSVFKek81Q2M/edit?usp=sharing

The APK in the Google Store (Taksiran Zakat Emas Kalkulator)

The Java code

package net.kerul.kirazakatemas;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;

import com.google.ads.AdRequest;
import com.google.ads.AdView;

public class KiraZakatEmas extends Activity implements OnClickListener {

    private AdView adView;
    private EditText txtberat, txtharga, txtnisab, txtnilai, txtkira;
    private Button btnkira;
    private ImageButton btninfo, btnshare;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_kira_zakat_emas);
        
        //UI
        txtberat=(EditText)findViewById(R.id.txtberatemas);
        txtberat.setGravity(Gravity.RIGHT);
        txtharga=(EditText)findViewById(R.id.txthargaemas);
        txtharga.setGravity(Gravity.RIGHT);
        txtnisab=(EditText)findViewById(R.id.txtnisab);
        txtnisab.setGravity(Gravity.RIGHT);
        txtnilai=(EditText)findViewById(R.id.txtnilai);
        txtnilai.setEnabled(false);
        txtnilai.setGravity(Gravity.RIGHT);
        txtkira=(EditText)findViewById(R.id.txtkira);
        txtkira.setEnabled(false);
        txtkira.setGravity(Gravity.RIGHT);
        
        //button
        btnkira=(Button)findViewById(R.id.btnkira);
        btnkira.setOnClickListener(this);
        btnshare=(ImageButton)findViewById(R.id.btnshare);
        btnshare.setOnClickListener(this);
        btninfo=(ImageButton)findViewById(R.id.btninfo);
        btninfo.setOnClickListener(this);
        
        //admob widget
        adView = (AdView)findViewById(R.id.ad);
        adView.loadAd(new AdRequest());
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_kira_zakat_emas, menu);
        return true;
    }
    
    public boolean onOptionsItemSelected(MenuItem item){
        
        switch (item.getItemId()){
        case R.id.mkongsi:
            invokesharing();
            break;
        case R.id.minfo:
            displayinfo();
            break;
        }
        return true;
    }

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        double berat, harga, nilai, nisab, kira;
        if (arg0.getId()==R.id.btnkira){
            
            if (txtberat.getText().toString().equals("")){
                AlertDialog.Builder dlgAlert  = new AlertDialog.Builder(this);

                dlgAlert.setMessage("Sila masukkan berat emas (gram)");
                dlgAlert.setTitle("Zakat Emas Kalkulator");
                dlgAlert.setPositiveButton("Ok",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                              //dismiss the dialog  
                            }
                        });
                dlgAlert.setCancelable(true);
                dlgAlert.create().show();
                txtberat.requestFocus();
            }
            else if (txtharga.getText().toString().equals("")){
                AlertDialog.Builder dlgAlert  = new AlertDialog.Builder(this);

                dlgAlert.setMessage("Sila masukkan harga emas semasa(per gram)");
                dlgAlert.setTitle("Zakat Emas Kalkulator");
                dlgAlert.setPositiveButton("Ok",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                              //dismiss the dialog  
                            }
                        });
                dlgAlert.setCancelable(true);
                dlgAlert.create().show();
                txtharga.requestFocus();
            }
            else{
                berat=Double.parseDouble(txtberat.getText().toString());
                harga=Double.parseDouble(txtharga.getText().toString());
                nisab=Double.parseDouble(txtnisab.getText().toString());
                
                nilai=berat*harga;
                //nisab=txtnisab.getText().toString());
                if(berat>85){//boleh dikena zakan
                    
                    kira=(berat-85)*harga*0.025;
                    txtnilai.setText(String.valueOf(nilai));
                    txtkira.setText(String.valueOf(kira));
                }
                else {//tak zakat
                    txtnilai.setText(String.valueOf(nilai));
                    txtkira.setText("Tidak wajib zakat.");
                }
            }
        }//btnkira
        else if (arg0.getId()==R.id.btnshare){
            invokesharing();
        }//btnshare
        else if (arg0.getId()==R.id.btninfo){
            displayinfo();
        }//btnshare
        
    }
    
    public void displayinfo(){ //fucntion to display OK dialog box
        AlertDialog.Builder dlgAlert  = new AlertDialog.Builder(this);

        dlgAlert.setMessage("Dibangunkan oleh IT Zakat Pulau Pinang. " +
                "Maklumat lanjut http://zakatpenang.com");
        dlgAlert.setTitle("Zakat Emas Kalkulator");
        dlgAlert.setPositiveButton("Ok",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                      //dismiss the dialog  
                    }
                });
        dlgAlert.setCancelable(true);
        dlgAlert.create().show();
    }
    public void invokesharing(){ //function to invoke sharing intent
        Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
        sharingIntent.setType("text/plain");
        String shareBody = "Apps Taksir Zakat Emas muat turun di Google Store...\n";
        shareBody=shareBody+"http://zakatpenang.com #zakatkalkulator";
        sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Apps Taksir Zakat Emas");
        sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
        startActivity(Intent.createChooser(sharingIntent, "Kongsikan melalui:"));
    }

}