title: Back button in android studio
body: <p>Hi guys i try to implement a back button in android studio that will bring me back to my previous activity.I manage to display the button on my app but when i press the button it just don't function .There is no error in my program. </p>
  
  <pre><code> package com.example.window8.myfriend;
  
  import android.app.ActionBar;
  import android.app.Activity;
  import android.content.Intent;
  import android.support.v7.app.ActionBarActivity;
  import android.os.Bundle;
  import android.view.Menu;
  import android.view.MenuItem;
  
  public class design extends ActionBarActivity {
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_design);
  android.support.v7.app.ActionBar actionBar = getSupportActionBar();
      actionBar.setLogo(R.drawable.images);
      actionBar.setDisplayUseLogoEnabled(true);
      actionBar.setDisplayShowHomeEnabled(true);
      actionBar.setDisplayHomeAsUpEnabled(true);
  
  }
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.menu_image, menu);
  
      return true;
  }
  
  public boolean onOptionsItemSelected(MenuItem item) {
      // Handle action bar item clicks here. The action bar will
      // automatically handle clicks on the Home/Up button, so long
      // as you specify a parent activity in AndroidManifest.xml.
      int id = item.getItemId();
  
  
      //noinspection SimplifiableIfStatement
      if (id == R.id.home) {
  
          Intent intent = new Intent(getApplicationContext(),Systemtime.class);
          startActivity(intent);
  
          return true;
  
  
      }
  
      return super.onOptionsItemSelected(item);
  }
  </code></pre>
  
  <p>}</p>