Просто вылетает при нажатии на кнопку "8 class, хотя должен переходить на новое активити. Контроллер в котором нажимается кнопка:
public class MainActivity extends AppCompatActivity {
public Button sevenb, eightb, nineb, tenb, elevenb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sevenb = findViewById(R.id.button1);
eightb = findViewById(R.id.button2);
nineb = findViewById(R.id.button3);
tenb = findViewById(R.id.button4);
elevenb = findViewById(R.id.button5);
}
public void seven(View view) {
//setContentView(R.layout.seven);
Intent intent = new Intent(getApplicationContext(), SevenControl.class);
startActivity(intent);
}
public void eight(View view) {
//setContentView(R.layout.eight);
Intent intent = new Intent(getApplicationContext(), EightController.class);
startActivity(intent);
}
public void nine(View view) {
System.out.println("--");
}
public void ten(View view) {
System.out.println("--");
}
public void eleven(View view) {
System.out.println("--");
}
}
Контроллер активити "8 class"
public class EightController extends AppCompatActivity {
public Button b;
public Intent intent;
public TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.eight);
b=findViewById(R.id.button8);
tv=findViewById(R.id.textView8);
final Spinner spinner = (Spinner)findViewById(R.id.spinner8);
ArrayAdapter<?> adapter =
ArrayAdapter.createFromResource(this, R.array.eightClass, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@SuppressLint("SetTextI18n")
public void onItemSelected(AdapterView<?> parent, View itemSelected, int selectedItemPosition, long selectedId) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
public void back8(View view) {
}
}
xml активити "8 class"
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".EightController"
>
<Spinner
android:id="@+id/spinner8"
android:layout_width="0dp"
android:layout_height="82dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:entries="@array/eightClass"
/>
<TextView
android:id="@+id/textView8"
android:layout_width="366dp"
android:layout_height="508dp"
android:layout_marginTop="28dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/spinner8" />
<Button
android:id="@+id/button8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginBottom="16dp"
android:onClick="back8"
android:text="@string/back"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
