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/*
* Copyright 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.actionbarcompat;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
/**
* An abstract class that handles some common action bar-related functionality in the app. This
* class provides functionality useful for both phones and tablets, and does not require any Android
* 3.0-specific features, although it uses them if available.
*
* Two implementations of this class are {@link ActionBarHelperBase} for a pre-Honeycomb version of
* the action bar, and {@link ActionBarHelperHoneycomb}, which uses the built-in ActionBar features
* in Android 3.0 and later.
*/
public abstract class ActionBarHelper {
protected Activity mActivity;
/**
* Factory method for creating {@link ActionBarHelper} objects for a
* given activity. Depending on which device the app is running, either a basic helper or
* Honeycomb-specific helper will be returned.
*/
public static ActionBarHelper createInstance(Activity activity) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
return new ActionBarHelperICS(activity);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
return new ActionBarHelperHoneycomb(activity);
} else {
return new ActionBarHelperBase(activity);
}
}
protected ActionBarHelper(Activity activity) {
mActivity = activity;
}
/**
* Action bar helper code to be run in {@link Activity#onCreate(android.os.Bundle)}.
*/
public void onCreate(Bundle savedInstanceState) {
}
/**
* Action bar helper code to be run in {@link Activity#onPostCreate(android.os.Bundle)}.
*/
public void onPostCreate(Bundle savedInstanceState) {
}
/**
* Action bar helper code to be run in {@link Activity#onCreateOptionsMenu(android.view.Menu)}.
*
* NOTE: Setting the visibility of menu items in <em>menu</em> is not currently supported.
*/
public boolean onCreateOptionsMenu(Menu menu) {
return true;
}
/**
* Action bar helper code to be run in {@link Activity#onTitleChanged(CharSequence, int)}.
*/
protected void onTitleChanged(CharSequence title, int color) {
}
/**
* Sets the indeterminate loading state of the item with ID {@link R.id.menu_refresh}.
* (where the item ID was menu_refresh).
*/
public abstract void setRefreshActionItemState(boolean refreshing);
/**
* Returns a {@link MenuInflater} for use when inflating menus. The implementation of this
* method in {@link ActionBarHelperBase} returns a wrapped menu inflater that can read
* action bar metadata from a menu resource pre-Honeycomb.
*/
public MenuInflater getMenuInflater(MenuInflater superMenuInflater) {
return superMenuInflater;
}
}
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