samples/Support7Demos/src/com/example/android/supportv7/app/ActionBarSettingsActionProviderActivity.java

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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.supportv7.app;

import com.example.android.supportv7.R;

import android.content.Context;
import android.content.Intent;
import android.provider.Settings;
import android.support.v4.view.ActionProvider;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;

/**
 * This activity demonstrates how to implement an {@link android.view.ActionProvider}
 * for adding functionality to the Action Bar. In particular this demo creates an
 * ActionProvider for launching the system settings and adds a menu item with that
 * provider.
 */
public class ActionBarSettingsActionProviderActivity extends AppCompatActivity {
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.action_bar_settings_action_provider, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // If this callback does not handle the item click, onPerformDefaultAction
        // of the ActionProvider is invoked. Hence, the provider encapsulates the
        // complete functionality of the menu item.
        Toast.makeText(this, R.string.action_bar_settings_action_provider_no_handling,
                Toast.LENGTH_SHORT).show();
        return false;
    }

    public static class SettingsActionProvider extends ActionProvider {
        /** An intent for launching the system settings. */
        private static final Intent sSettingsIntent = new Intent(Settings.ACTION_SETTINGS);

        /**
         * Creates a new instance.
         *
         * @param context Context for accessing resources.
         */
        public SettingsActionProvider(Context context) {
            super(context);
        }

        @Override
        public View onCreateActionView() {
            // Inflate the action view to be shown on the action bar.
            LayoutInflater layoutInflater = LayoutInflater.from(getContext());
            View view = layoutInflater.inflate(R.layout.action_bar_settings_action_provider, null);
            ImageButton button = (ImageButton) view.findViewById(R.id.button);
            // Attach a click listener for launching the system settings.
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    getContext().startActivity(sSettingsIntent);
                }
            });
            return view;
        }

        @Override
        public boolean onPerformDefaultAction() {
            // This is called if the host menu item placed in the overflow menu of the
            // action bar is clicked and the host activity did not handle the click.
            getContext().startActivity(sSettingsIntent);
            return true;
        }
    }
}