Android开发之ActionBar Item使用技巧

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.SearchView;
import android.widget.SearchView.OnQueryTextListener;
import android.widget.TextView;
import android.widget.Toast;
/**
 * This demonstrates idiomatic usage of the Action Bar. The default Honeycomb theme
 * includes the action bar by default and a menu resource is used to populate the
 * menu data itself. If you'd like to see how these things work under the hood, see
 * ActionBarMechanics.
 */
public class ActionBarUsageActivity extends Activity implements OnQueryTextListener {
  TextView mSearchText;
  int mSortMode = -1;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mSearchText = new TextView(this);
    setContentView(mSearchText);
  }
  //和加载传统的menu一样，重写onCreateOptionsMenu方法
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.actions, menu);
    SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
    searchView.setOnQueryTextListener(this);
    return true;
  }
  @Override
  public boolean onPrepareOptionsMenu(Menu menu) {
    if (mSortMode != -1) {
      Drawable icon = menu.findItem(mSortMode).getIcon();
      menu.findItem(R.id.action_sort).setIcon(icon);
    }
    return super.onPrepareOptionsMenu(menu);
  }
  //和相应传统的menu一样，重写onOptionsItemSelected方法
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    Toast.makeText(this, "Selected Item: " + item.getTitle(), Toast.LENGTH_SHORT).show();
    return true;
  }
  // This method is specified as an onClick handler in the menu xml and will
  // take precedence over the Activity's onOptionsItemSelected method.
  // See res/menu/actions.xml for more info.
  public void onSort(MenuItem item) {
    mSortMode = item.getItemId();
    // Request a call to onPrepareOptionsMenu so we can change the sort icon
    invalidateOptionsMenu();
  }
  // The following callbacks are called for the SearchView.OnQueryChangeListener
  // For more about using SearchView, see src/.../view/SearchView1.java and SearchView2.java
  public boolean onQueryTextChange(String newText) {
    newText = newText.isEmpty() ? "" : "Query so far: " + newText;
    mSearchText.setText(newText);
    return true;
  }
  public boolean onQueryTextSubmit(String query) {
    Toast.makeText(this, "Searching for: " + query + "...", Toast.LENGTH_SHORT).show();
    return true;
  }
}