ActionBarUsage.java

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The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...

/*
 * Copyright (C) 2010 The Android开源工程
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.apis.app;

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;

import com.example.android.apis.R;

/**
 * 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 ActionBarUsage extends Activity implements OnQueryTextListener {
    TextView mSearchText;
    int mSortMode = -1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mSearchText = new TextView(this);
        setContentView(mSearchText);
    }

    @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);
    }

    @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;
    }
}