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  @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_answer);

   
        //getActionBar().setHomeButtonEnabled(true)
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

   
    }

    

    @Override
    public boolean onSupportNavigateUp() {
        onBackPressed(); // goto previous activity when actionbar backbutton clicked
        return super.onSupportNavigateUp();
    }