I am not able to do this check already tried everything, but it always gives me this error:
java.lang.NumberFormatException: Invalid double: ""
If anyone can help, thank you.
package com.calculadora;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.AppCompatEditText;
import android.support.v7.widget.AppCompatTextView;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private Button btncalc, btnlimpar;
private AppCompatEditText edn1, edn2;
private AppCompatTextView txtResult;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
btncalc = (Button) findViewById(R.id.calcular);
btnlimpar = (Button) findViewById(R.id.limpar);
edn1 = (AppCompatEditText)findViewById(R.id.n1);
edn2 = (AppCompatEditText)findViewById(R.id.n2);
txtResult = (AppCompatTextView)findViewById(R.id.result);
btncalc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
double n1 = Double.parseDouble(edn1.getText().toString());
double n2 = Double.parseDouble(edn2.getText().toString());
double res = (n1*2 + n2*3) / 5;
if(res >= 6){
txtResult.setText("Voce Foi Aprovado Parabens Sua nota é: " + res);
txtResult.setTextColor(Color.parseColor("#3F51B5"));
edn1.setText("");
edn2.setText("");
}else if(res < 6){
txtResult.setText("Voce Foi Reprovado Estude Mais da Próxima Sua nota é: " + res);
txtResult.setTextColor(Color.parseColor("#F44336"));
edn1.setText("");
edn2.setText("");
/*Linha Com Erro é essa*/ }else if(TextUtils.isEmpty(edn1.getText().toString()) && TextUtils.isEmpty(edn2.getText().toString())) {
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setTitle("Aviso");
dialog.setMessage("Campo Vazio!");
dialog.setNeutralButton("OK", null);
dialog.show();
}
}
});
btnlimpar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
edn1.setText("");
edn2.setText("");
txtResult.setText("");
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == R.id.action_sobre){
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("Sobre o App");
dialog.setMessage(R.string.mensage);
dialog.setNeutralButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent it = new Intent();
it.setData(Uri.parse("http://www.facebook.com/diogosilvam"));
startActivity(it);
}
});
dialog.show();
}
return super.onOptionsItemSelected(item);
}
}
XML:
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/toolbar"
android:padding="10dp">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="320dp"
android:layout_marginTop="50dp"
app:cardBackgroundColor="#fff"
app:cardCornerRadius="4dp"
app:cardElevation="4dp">
<ImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:src="@drawable/logo" />
<android.support.v7.widget.AppCompatTextView
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:paddingLeft="48dp"
android:text="Preencha as suas notas para calcular sua média"
android:textColor="#000"
android:textSize="18sp" />
<android.support.v7.widget.AppCompatTextView
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="60dp"
android:paddingLeft="14dp"
android:text="N1 (0-10)"
android:textColor="#000"
android:textSize="18sp" />
<android.support.v7.widget.AppCompatEditText
android:textStyle="bold"
android:id="@+id/n1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="90dp"
android:hint="0.0"
android:numeric="decimal"
android:paddingLeft="14dp"
android:textColor="#000"
android:textColorHint="#919191"
android:maxLength="3"/>
<android.support.v7.widget.AppCompatTextView
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="130dp"
android:paddingLeft="14dp"
android:text="N2 (0-10)"
android:textColor="#000"
android:textSize="18sp" />
<android.support.v7.widget.AppCompatEditText
android:textStyle="bold"
android:maxLength="3"
android:isScrollContainer="false"
android:id="@+id/n2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="160dp"
android:hint="0.0"
android:numeric="decimal"
android:paddingLeft="14dp"
android:textColor="#000"
android:windowSoftInputMode="adjustPan"
android:textColorHint="#919191" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:textStyle="bold"
android:id="@+id/calcular"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="12dp"
android:layout_marginTop="210dp"
android:layout_weight="1"
android:background="@color/colorPrimary"
android:elevation="4dp"
android:stateListAnimator="@anim/btn_anim"
android:text="Calcular" />
<Button
android:textStyle="bold"
android:id="@+id/limpar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="12dp"
android:layout_marginTop="210dp"
android:layout_weight="1"
android:background="@color/colorPrimary"
android:elevation="4dp"
android:stateListAnimator="@anim/btn_anim"
android:text="Limpar" />
</LinearLayout>
<android.support.v7.widget.AppCompatTextView
android:textStyle="bold"
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="270dp"
android:paddingLeft="14dp"
android:text="Resultado"
android:textColor="#000"
android:textSize="18sp" />
</android.support.v7.widget.CardView>
</LinearLayout>