I have quite a simple application. However, after I clik on the button, app crashes. Tried to debug it and the problem seems to be in first 3 row of the onClick method. Once I tried to get there values manually, not via those edit boxes, everything went smoothly. Any ideas please?
public class MainActivity extends AppCompatActivity {
EditText editText_pocetKM;
EditText editText_spotreba;
EditText editText_cenaPHM;
TextView textView_spotrebaO;
TextView textView_cenaO;
DecimalFormat df = new DecimalFormat("0.00##");
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText_pocetKM = (EditText) findViewById(R.id.editText1_pocetKM);
editText_spotreba = (EditText) findViewById(R.id.editText_Spotreba);
editText_cenaPHM = (EditText) findViewById(R.id.editText1_cenaPHM);
textView_spotrebaO = (TextView) findViewById(R.id.textView_spotrebaO);
textView_cenaO = (TextView) findViewById(R.id.textView_cenaO);
}
public void onClick(View v) {
Double pocetKm = Double.parseDouble(editText_pocetKM.getText().toString());
Double spotreba = Double.parseDouble(editText_spotreba.getText().toString());
Double cenaPHM = Double.parseDouble(editText_cenaPHM.getText().toString());
Double spotrebaO = spotreba * pocetKm / 100;
Double cenaO = spotrebaO * cenaPHM;
textView_cenaO.setText("Cena za spotřebované palivo bude "+ df.format(cenaO) + " Kč");
textView_spotrebaO.setText("Celkem bude spotřebováno "+ df.format(spotrebaO) + " litrů paliva");
}
}
You didn't provide the logcat of your crash report. If the logcat was provided we could be certain of your exact problem. But anyway, as you've got rid of your crash by removing the first three lines of your onClick function, I suppose you're setting invalid inputs in your EditText.
You're parsing the text entered in the EditText to double which will fail if the input is not a valid double string. For example, it'll parse 11.01 fine when it'll throw an exception while parsing Hello.
So to check if the application is crashing for a parsing error, you might consider surrounding them with a try/catch block like this.
try {
Double pocetKm = Double.parseDouble(editText_pocetKM.getText().toString());
Double spotreba = Double.parseDouble(editText_spotreba.getText().toString());
Double cenaPHM = Double.parseDouble(editText_cenaPHM.getText().toString());
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "Parsing error", Toast.LENGTH_LONG).show();
}
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