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@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
    super.onCreate(savedInstanceState);
But it is messy to write this code in every screen. Have any way to declare it in manifest application or any where.
                AFAIK the only attribute available is android:windowSoftInputMode which will set SoftInput flag . So you need to set WindowManager's Flags at runtime .
– ADM
                Aug 29, 2018 at 9:10
Create a BaseActivity for your app and make all the other Activities extend it.
public class BaseActivity extends AppCompatActivity {
   @Override
   protected void onCreate(@Nullable Bundle savedInstanceState) {
       getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
       super.onCreate(savedInstanceState);
Then you create your activities like this:
public class MyActivity extends BaseActivity {
       @Override
       protected void onCreate(@Nullable Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           // Your code
        
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