1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.apis.app; 18 19 import android.app.Activity; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.provider.Settings; 23 import android.view.ActionProvider; 24 import android.view.LayoutInflater; 25 import android.view.Menu; 26 import android.view.MenuItem; 27 import android.view.View; 28 import android.widget.ImageButton; 29 import android.widget.Toast; 30 31 import com.example.android.apis.R; 32 33 /** 34 * This activity demonstrates how to implement an {@link android.view.ActionProvider} 35 * for adding functionality to the Action Bar. In particular this demo creates an 36 * ActionProvider for launching the system settings and adds a menu item with that 37 * provider. 38 */ 39 public class ActionBarSettingsActionProviderActivity extends Activity { 40 41 /** 42 * {@inheritDoc} 43 */ 44 @Override 45 public boolean onCreateOptionsMenu(Menu menu) { 46 super.onCreateOptionsMenu(menu); 47 getMenuInflater().inflate(R.menu.action_bar_settings_action_provider, menu); 48 return true; 49 } 50 51 /** 52 * {@inheritDoc} 53 */ 54 @Override 55 public boolean onOptionsItemSelected(MenuItem item) { 56 // If this callback does not handle the item click, onPerformDefaultAction 57 // of the ActionProvider is invoked. Hence, the provider encapsulates the 58 // complete functionality of the menu item. 59 Toast.makeText(this, R.string.action_bar_settings_action_provider_no_handling, 60 Toast.LENGTH_SHORT).show(); 61 return false; 62 } 63 64 public static class SettingsActionProvider extends ActionProvider { 65 66 /** An intent for launching the system settings. */ 67 private static final Intent sSettingsIntent = new Intent(Settings.ACTION_SETTINGS); 68 69 /** Context for accessing resources. */ 70 private final Context mContext; 71 72 /** 73 * Creates a new instance. 74 * 75 * @param context Context for accessing resources. 76 */ 77 public SettingsActionProvider(Context context) { 78 super(context); 79 mContext = context; 80 } 81 82 /** 83 * {@inheritDoc} 84 */ 85 @Override 86 public View onCreateActionView() { 87 // Inflate the action view to be shown on the action bar. 88 LayoutInflater layoutInflater = LayoutInflater.from(mContext); 89 View view = layoutInflater.inflate(R.layout.action_bar_settings_action_provider, null); 90 ImageButton button = (ImageButton) view.findViewById(R.id.button); 91 // Attach a click listener for launching the system settings. 92 button.setOnClickListener(new View.OnClickListener() { 93 @Override 94 public void onClick(View v) { 95 mContext.startActivity(sSettingsIntent); 96 } 97 }); 98 return view; 99 } 100 101 /** 102 * {@inheritDoc} 103 */ 104 @Override 105 public boolean onPerformDefaultAction() { 106 // This is called if the host menu item placed in the overflow menu of the 107 // action bar is clicked and the host activity did not handle the click. 108 mContext.startActivity(sSettingsIntent); 109 return true; 110 } 111 } 112 } 113