Android: calculate price from clicked items in listview. App crashes in total activity logcat:invalid float: “”

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Im a noob in this so please bear with me. I have a listview of food and drinks with price then a proceed button which will show the order summary and total amount in other activity. After I click some items then click the proceed button, the app crash "Unfortunately appname has stopped." But when I click proceed button without clicking any items it displays the layout of the order summary. Therefore the error occurs in the passing of data. In logcat I noticed first Invalid float: "" I have no idea how to fix this.

What I have tried:

package edu.sti.snapchit;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.StringTokenizer;
import java.lang.String;


public class TotalsActivity extends AppCompatActivity{

MyApp mApp;
EditText et_summary;
TextView tv_total;
Button btn_code;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.totals);
    btn_code = (Button) findViewById(R.id.btn_code);
    mApp=((MyApp)getApplicationContext());
    et_summary = (EditText) findViewById(R.id.et_summary);
    tv_total = (TextView) findViewById(R.id.tv_total);
    et_summary.setText(mApp.getGlobalVarValue());
    String str = mApp.getGlobalVarValue();
    StringTokenizer st = new StringTokenizer(str,"Php");
    String test="";
    float total=0;
    int count =0;

    while(st.hasMoreElements())
    {
        test = st.nextElement().toString().substring(0,1);
        if(count>0)
            total += Float.parseFloat(test);
        count++;
    }

    tv_total.setText("Total:" + total+"");
    mApp.setGlobalClear();
    btn_code.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent intent = new Intent(TotalsActivity.this, GeneratorActivity.class);
            startActivity(intent);
        }
    });

}


public boolean isFloat(String input)
{

    try
    {
        Float.parseFloat(input);
        return true;
    }
    catch(Exception e)
    {
        return false;
    }
}

}

Code for Food Activity which contains the listview

package edu.sti.snapchit;

import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import java.util.HashMap;

public class NewFoodsActivity extends AppCompatActivity {

MyApp mApp;
private HashMap<String, Location> locations;
ListView listView1;
SQLiteDatabase db;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
db=openOrCreateDatabase("Foods_DB", Context.MODE_PRIVATE, null);
setContentView(R.layout.new_foods);
locations = loadLocationData();
addListenerButton();
initializeUI();
}
public void initializeUI()
{
String[] foodies = getFoodNames();
ArrayAdapter<string> adapter = new ArrayAdapter<string>
(this,android.R.layout.simple_list_item_1, foodies);
listView1.setAdapter(adapter);
}
private String[] getFoodNames()
{
String[] foodies = new String[locations.size()];
foodies = locations.keySet().toArray(foodies);
return foodies;
}
private void displaySelectedFoodInfo(String foodName)
{

}
public void showMessage(String title,String message)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(message);
builder.show();
}
private HashMap<String, Location>loadLocationData()
{
HashMap<String, Location>locations = new HashMap<String, Location>();
Cursor c=db.rawQuery("SELECT * FROM table_foods order by food_id
asc",null);
StringBuffer buffer = new StringBuffer();
while(c.moveToNext())
{
locations.put("- "+c.getString(1).toString()+" [Php
"+c.getString(2).toString()+"]", new Location(Integer.parseInt(c.getString(0)),c.getString(1).toString(),Double.parseDouble(c.getString(2))));

}
return locations;
}
public void addListenerButton()
{
final Context context = this;
Button btnAdd = (Button)findViewById(R.id.btn_add);
Button btnProceed = (Button)findViewById(R.id.btnProceed);
Button btn_drinks = (Button)findViewById(R.id.btn_drinks);
Button btn_foods = (Button)findViewById(R.id.btn_foods);
listView1 = (ListView) findViewById(R.id.listView1);
listView1.setOnItemClickListener(
new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> Arg0, View view, int
position, long id) {
Object o = listView1.getItemAtPosition(position);
String pen = o.toString();

mApp=((MyApp)getApplicationContext());
mApp.setGlobalVarValue(pen);
Toast.makeText(getApplicationContext(), "Item Added" +
""+ pen, Toast.LENGTH_LONG).show();

}
}
);
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(context, NewAddFoods.class);

startActivity(intent);
}
});
btnProceed.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(context, TotalsActivity.class);

startActivity(intent);
}
});
btn_foods.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(context, NewFoodsActivity.class);

startActivity(intent);
}
});
btn_drinks.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(context, NewDrinksActivity.class);

startActivity(intent);
}
});
}
}

This is the colored red text in LOGCAT

02-20 04:37:23.624 1447-1447/edu.sti.snapchit E/AndroidRuntime: FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{edu.sti.snapchit/edu.sti.snapchit.TotalsActivity}: java.lang.NumberFormatException: Invalid float: "" at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) at android.app.ActivityThread.access$600(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5103) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NumberFormatException: Invalid float: "" at java.lang.StringToReal.invalidReal(StringToReal.java:63) at java.lang.StringToReal.parseFloat(StringToReal.java:289) at java.lang.Float.parseFloat(Float.java:300) at edu.sti.snapchit.TotalsActivity.onCreate(TotalsActivity.java:40) at android.app.Activity.performCreate(Activity.java:5133) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)

02-20 04:37:29.372 1494-1494/edu.sti.snapchit E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering

02-20 04:37:30.592 1494-1494/edu.sti.snapchit E/OpenGLRenderer: Getting MAX_TEXTURE_SIZE from GradienCache 02-20 04:37:30.616 1494-1494/edu.sti.snapchit E/OpenGLRenderer: Getting MAX_TEXTURE_SIZE from Caches::initConstraints()

Ps. Yes I did followed a youtube tutorial in making this app. The app in vid is working perfectly while mine crashes. Either I missed something but I checked the code like 10 times or either there are parts of the vid been skipped. The uploader havent respond for days :(

I almost forgot there might also another reason that caused this. In TotalsActivity the method isFloat is never used.

Posted 20-Feb-18 1:45am

JohnRolston777

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Comments

David Crow 20-Feb-18 12:17pm

You'd be better served by asking this type/length of question in the actual Android forum. The Q&A forum is for short questions and answers, not lengthy code dumps.

David Crow 20-Feb-18 12:22pm

The NumberFormatException says it all. You are calling parseFloat() with an invalid string (e.g., empty perhaps). Single step through the code to find out why.

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JohnRolston777 · Answer 1 · 2018-02-20T01:48:00

UPDATE
I CHANGE THE CODE IN Totals Activity to this. but still nothing change. no luck

package edu.sti.snapchit;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.StringTokenizer;
import java.lang.String;


public class TotalsActivity extends AppCompatActivity{

    MyApp mApp;
    EditText et_summary;
    TextView tv_total;
    Button btn_code;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.totals);
        btn_code = (Button) findViewById(R.id.btn_code);
        mApp=((MyApp)getApplicationContext());
        et_summary = (EditText) findViewById(R.id.et_summary);
        tv_total = (TextView) findViewById(R.id.tv_total);
        et_summary.setText(mApp.getGlobalVarValue());
        String str = mApp.getGlobalVarValue();
        StringTokenizer st = new StringTokenizer(str,"Php");
        String test="";
        float total=0;
        int count =0;

        while(st.hasMoreElements())
        {
            test = st.nextElement().toString().substring(0,1);
            if(count>0 && test !=null && !test.isEmpty()){
                total += Float.parseFloat(test);
            }
            count++;
        }

        tv_total.setText("Total:" + total+"");
        mApp.setGlobalClear();
        btn_code.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intent = new Intent(TotalsActivity.this, GeneratorActivity.class);
                startActivity(intent);
            }
        });

    }


    public boolean isFloat(String input)
    {

        if(input.isEmpty() || input == null)
            return false;

        try
        {
            Float.parseFloat(input);
            return true;
        }
        catch(Exception e)
        {
            return false;
        }
    }

}