Configura el tema de tu aplicacion con tema claro y oscuro y guarda el estado del tema con SharedPreferences
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<resources xmlns:tools="http://schemas.android.com/tools">
<!-- Base application theme. -->
<style name="Base.Theme.Tema" parent="Theme.Material3.Dark.NoActionBar">
<item name="android:textColor">@color/white</item>
<item name="android:statusBarColor">#292727</item>
</style>
<style name="diseño_boton" parent="Widget.Material3.Button">
<item name="backgroundTint">@color/white</item>
<item name="android:textColor">@color/black</item>
</style>
</resources><resources xmlns:tools="http://schemas.android.com/tools">
<!-- Base application theme. -->
<style name="Base.Theme.Tema" parent="Theme.Material3.Light.NoActionBar">
<!-- Customize your light theme here. -->
<item name="backgroundTint">@color/white</item>
<item name="android:statusBarColor">@color/white</item>
</style>
<style name="diseño_boton" parent="Widget.Material3.Button">
<item name="backgroundTint">@color/black</item>
<item name="android:textColor">@color/white</item>
</style>
</resources>
public class MainActivity extends AppCompatActivity {
Boolean guarda_estado;
SharedPreferences sharedPreferences_leer;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button_activity=findViewById(R.id.button);
textView =findViewById(R.id.textView);
button_activity.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent hh = new Intent(MainActivity.this,MainActivity2.class);
startActivity(hh);
}
});
}
@Override
protected void onResume() {
super.onResume();
sharedPreferences_leer =getSharedPreferences("guardar_tema", Context.MODE_PRIVATE);
guarda_estado=sharedPreferences_leer.getBoolean("guarda_estado",false);
if (guarda_estado == true) {
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
textView.setText("TEMA OSCURO");
}
if (guarda_estado == false) {
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
textView.setText("TEMA CLARO");
}
}
}
public class MainActivity2 extends AppCompatActivity {
SharedPreferences sharedPreferences_insertar;
SharedPreferences sharedPreferences_leer;
Boolean guarda_estado;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
MaterialSwitch on = findViewById(R.id.switch_indeter);
sharedPreferences_leer =getSharedPreferences("guardar_tema", Context.MODE_PRIVATE);
guarda_estado=sharedPreferences_leer.getBoolean("guarda_estado",false);
MaterialSwitch on2=findViewById(R.id.switch_indeter);
if (guarda_estado == true) {
on2.setChecked(true);
}
if (guarda_estado == false) {
on2.setChecked(false);
}
on.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean activo) {
sharedPreferences_insertar =getSharedPreferences("guardar_tema", Context.MODE_PRIVATE);
SharedPreferences.Editor editor= sharedPreferences_insertar.edit();
editor.putBoolean("guarda_estado",activo);
if (activo == true) {
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
}
if (activo == false) {
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
}
editor.commit();
}
});
}
}
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="HOLA MUNDO"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button"
style="@style/diseño_boton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Actividad Configuracion"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
app:layout_constraintVertical_bias="0.79" />
</androidx.constraintlayout.widget.ConstraintLayout>
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity2">
<com.google.android.material.materialswitch.MaterialSwitch
android:id="@+id/switch_indeter"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="675dp"
android:layout_weight="1"
android:text="Modo oscuro"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>