You just need to add this line in the activity

getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE,
   WindowManager.LayoutParams.FLAG_SECURE);

you can see this example

package com.codeplaners;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.WindowManager;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE,
				WindowManager.LayoutParams.FLAG_SECURE);

    }
}

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