Store Color Setting | Store Theme Setting | Storing User Data By SharedPreferences

Step 01: Make A Menu.xml 

<item android:title="Red" android:id="@+id/redMenuID" app:showAsAction="never" /> <item android:title="Green" android:id="@+id/greenMenuID" app:showAsAction="never" /> <item android:title="Blue" android:id="@+id/blueMenuID" app:showAsAction="never" />

Step 02: Make A LinearLayout For Test The Changing Of Color MainActivity.xml

<linearlayout 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" android:id="@+id/line1" tools:context="com.example.rupom.mycolor.MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> </LinearLayout>

Step 03 : Now Follow The JAVA Codes MainActivity.JAVA

public class MainActivity extends AppCompatActivity { private LinearLayout linearLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); linearLayout=(LinearLayout) findViewById(R.id.line1); if(loadColor()!=getResources().getColor(R.color.colorPrimary)) { linearLayout.setBackgroundColor(loadColor()); } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater menuInflater=getMenuInflater(); menuInflater.inflate(R.menu.menu_layout,menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { if(item.getItemId()==R.id.redMenuID) { linearLayout.setBackgroundColor(getResources().getColor(R.color.redColor)); storeColor(getResources().getColor(R.color.redColor)); } if(item.getItemId()==R.id.greenMenuID) { linearLayout.setBackgroundColor(getResources().getColor(R.color.greenColor)); storeColor(getResources().getColor(R.color.greenColor)); } if(item.getItemId()==R.id.blueMenuID) { linearLayout.setBackgroundColor(getResources().getColor(R.color.blueColor)); storeColor(getResources().getColor(R.color.blueColor)); } return super.onOptionsItemSelected(item); } private void storeColor(int color) { SharedPreferences sharedPreferences=getSharedPreferences("My Data", Context.MODE_PRIVATE); SharedPreferences.Editor editor=sharedPreferences.edit(); editor.putInt("myColor",color); editor.commit(); } private int loadColor() { SharedPreferences sharedPreferences=getSharedPreferences("My Data", Context.MODE_PRIVATE); int selectedColor=sharedPreferences.getInt("myColor",getResources().getColor(R.color.colorPrimary)); return selectedColor; } }