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my xml `
<android.support.design.widget.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="0dp"
tools:ignore="MissingConstraints">
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.CardView
android:id="@+id/cardfejaum"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:layout_marginTop="20dp"
android:elevation="50dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/appBarLayout">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
<ImageView
android:id="@+id/fejaum"
android:layout_width="386dp"
android:layout_height="200dp"
android:background="@drawable/fejaum"
android:padding="4dp"
android:src="@color/transparencia"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="200dp" />
<android.support.design.widget.TextInputLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:textColorHint="#fff"
tools:layout_editor_absoluteX="168dp"
tools:layout_editor_absoluteY="205dp">
<android.support.design.widget.TextInputEditText
android:id="@+id/edt"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:backgroundTint="#fff"
android:hint="Comprado:"
android:inputType="number" />
</android.support.design.widget.TextInputLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="150dp"
android:text="No estoque"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Feijão"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff"
android:textSize="32sp" />
<SeekBar
android:id="@+id/seekBar"
android:layout_width="110dp"
android:layout_height="15dp"
android:layout_marginLeft="160dp"
android:layout_marginTop="158dp"
android:layout_weight="1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:max="4"
android:progressDrawable="@drawable/custom_seek_bar"
android:progress="6"/>
<TextView
android:id="@+id/tvseek"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="280dp"
android:layout_marginTop="150dp"
android:text="0"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff" />
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="120dp"
android:layout_marginTop="150dp"
android:text="0"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff" />
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ok"
android:textColor="#fff"
android:layout_marginTop="110dp"
android:layout_marginLeft="200dp"
android:background="@null"/>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/cardarroz"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:elevation="50dp"
app:layout_constraintEnd_toEndOf="@id/cardfejaum"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="@id/cardfejaum"
app:layout_constraintTop_toBottomOf="@+id/cardfejaum">
<ImageView
android:id="@+id/arroz"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="@drawable/arrozbranco"
android:padding="4dp"
android:src="@color/transparencia" />
<android.support.design.widget.TextInputLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="160dp"
android:layout_marginTop="130dp"
android:textColorHint="#fff"
tools:layout_editor_absoluteX="168dp"
tools:layout_editor_absoluteY="205dp">
<android.support.design.widget.TextInputEditText
android:id="@+id/edtarroz"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:backgroundTint="#fff"
android:hint="Usado:"
android:inputType="number" />
</android.support.design.widget.TextInputLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="150dp"
android:text="Restante"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff" />
<TextView
android:id="@+id/tvarroz"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="100dp"
android:layout_marginTop="150dp"
android:text="0"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Arroz"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff"
android:textSize="32sp" />
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/cardaçucar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="208dp"
android:elevation="50dp"
app:layout_constraintEnd_toEndOf="@id/cardfejaum"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="@id/cardfejaum"
app:layout_constraintTop_toBottomOf="@+id/cardfejaum">
<ImageView
android:id="@+id/açucar"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="@drawable/acucarrefinado"
android:padding="4dp"
android:src="@color/transparencia" />
<android.support.design.widget.TextInputLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="160dp"
android:layout_marginTop="130dp"
android:textColorHint="#fff"
tools:layout_editor_absoluteX="168dp"
tools:layout_editor_absoluteY="205dp">
<android.support.design.widget.TextInputEditText
android:id="@+id/edtaçucar"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:backgroundTint="#fff"
android:hint="Usado:"
android:inputType="number" />
</android.support.design.widget.TextInputLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="150dp"
android:text="Restante"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff" />
<TextView
android:id="@+id/tvaçucar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="100dp"
android:layout_marginTop="150dp"
android:text="0"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Açucar Refinado"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textColor="#fff"
android:textSize="32sp" />
</android.support.v7.widget.CardView>
My java code
`package org.lucas.aplicativo;
import android.support.design.widget.TextInputEditText;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.CardView;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
public class Principal extends AppCompatActivity {
CardView cardfejaum, cardarroz, cardaçucar;
TextInputEditText edtarroz, edtaçucar, edt;
TextView tv , tvarroz, tvaçucar, tvseek;
SeekBar seekBar;
Button btn;
int progresso;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_principal);
cardfejaum = findViewById(R.id.cardfejaum);
cardarroz = findViewById(R.id.cardarroz);
cardaçucar = findViewById(R.id.cardaçucar);
edt = findViewById(R.id.edt);
edtarroz = findViewById(R.id.edtarroz);
edtaçucar = findViewById(R.id.edtaçucar);
tv = findViewById(R.id.tv);
tvarroz = findViewById(R.id.tvarroz);
tvaçucar = findViewById(R.id.tvaçucar);
seekBar = findViewById(R.id.seekBar);
tvseek = findViewById(R.id.tvseek);
btn = findViewById(R.id.btn);
seekBar.setProgress(0);
seekBar.setMax(15);
calcular();
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int prog, boolean b) {
progresso = prog;
tvseek.setText(" "+prog);
calcular();
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
tvseek.setText(" "+progresso);
calcular();
}
});
tv.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
public void calcular() {
int sub = Integer.parseInt(edt.getText().toString());
int sub2 = Integer.parseInt(tvseek.getText().toString());
int calc = sub - sub2;
tv.setText(String.valueOf(calc));
}
}`
What problem? where it occurs? we need more details, do not ask the whole question in the statement
– GabrielLocalhost
I’m sorry I’m new here so...
– Lucas Santos Silva
@Lucassantossilva click on edit and add more information to your question
– igventurelli
Related: How to consider an empty Edittext as "0"
– ramaral