content: package com.taobao.middleware;
  
  import android.content.Intent;
  import android.os.Bundle;
  import android.support.design.widget.FloatingActionButton;
  import android.support.design.widget.Snackbar;
  import android.support.v7.widget.Toolbar;
  import android.view.View;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.app.ActionBar;
  import android.support.v4.app.NavUtils;
  import android.view.MenuItem;
  
  /**
   * An activity representing a single Item detail screen. This
   * activity is only used narrow width devices. On tablet-size devices,
   * item details are presented side-by-side with a list of items
   * in a {@link ItemListActivity}.
   */
  public class ItemDetailActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_item_detail);
          Toolbar toolbar = (Toolbar) findViewById(R.id.detail_toolbar);
          setSupportActionBar(toolbar);
  
          FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
          fab.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  Snackbar.make(view, "Replace with your own detail action", Snackbar.LENGTH_LONG)
                          .setAction("Action", null).show();
              }
          });
  
          // Show the Up button in the action bar.
          ActionBar actionBar = getSupportActionBar();
          if (actionBar != null) {
              actionBar.setDisplayHomeAsUpEnabled(true);
          }
  
          // savedInstanceState is non-null when there is fragment state
          // saved from previous configurations of this activity
          // (e.g. when rotating the screen from portrait to landscape).
          // In this case, the fragment will automatically be re-added
          // to its container so we don't need to manually add it.
          // For more information, see the Fragments API guide at:
          //
          // http://developer.android.com/guide/components/fragments.html
          //
          if (savedInstanceState == null) {
              // Create the detail fragment and add it to the activity
              // using a fragment transaction.
              Bundle arguments = new Bundle();
              arguments.putString(ItemDetailFragment.ARG_ITEM_ID,
                      getIntent().getStringExtra(ItemDetailFragment.ARG_ITEM_ID));
              ItemDetailFragment fragment = new ItemDetailFragment();
              fragment.setArguments(arguments);
              getSupportFragmentManager().beginTransaction()
                      .add(R.id.item_detail_container, fragment)
                      .commit();
          }
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          int id = item.getItemId();
          if (id == android.R.id.home) {
              // This ID represents the Home or Up button. In the case of this
              // activity, the Up button is shown. Use NavUtils to allow users
              // to navigate up one level in the application structure. For
              // more details, see the Navigation pattern on Android Design:
              //
              // http://developer.android.com/design/patterns/navigation.html#up-vs-back
              //
              NavUtils.navigateUpTo(this, new Intent(this, ItemListActivity.class));
              return true;
          }
          return super.onOptionsItemSelected(item);
      }
  }
  