注册界面的优化之ActionBar组件的应用之（二）ActionBar组件的事件处理

 1 //Register_Activity.java
 2 
 3 public class Register_Activity extends AppCompatActivity {
 4     ......
 5     @Override
 6     public boolean onOptionsItemSelected(MenuItem item) {
 7         //判断系统回去的item
 8         switch (item.getItemId()) {
 9             case R.id.ab_return:
10 
11                 Intent intent = new Intent();
12                 intent.setClass(Register_Activity.this, LoginActivity.class);
13                 startActivity(intent);
14                 finish();  //通知系统将该界面从内存中的栈中清除
15                 break;
16             default:
17                 break;
18         }
19         return true;
20     }
21 }