ABSActivity.java

package com.mjj.clickeffect;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;

public class ABSActivity extends AppCompatActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		getSupportActionBar().setDisplayHomeAsUpEnabled(true);
	}

	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		
		if(item.getItemId() == android.R.id.home){
			this.finish();
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}