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/* * Copyright 2011 The Android Open Source Project *// w w w . j a v a2 s .co m * 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 org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import android.app.Activity; import android.content.Context; import android.content.res.XmlResourceParser; import android.os.Bundle; import android.view.InflateException; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ProgressBar; import android.widget.TextView; import java.io.IOException; import java.util.HashSet; import java.util.Set; /** * A class that implements the action bar pattern for pre-Honeycomb devices. */ public class ActionBarHelperBase extends ActionBarHelper { private static final String MENU_RES_NAMESPACE = "http://schemas.android.com/apk/res/android"; private static final String MENU_ATTR_ID = "id"; private static final String MENU_ATTR_SHOW_AS_ACTION = "showAsAction"; protected Set<Integer> mActionItemIds = new HashSet<Integer>(); protected ActionBarHelperBase(Activity activity) { super(activity); } /**{@inheritDoc}*/ @Override public void onCreate(Bundle savedInstanceState) { mActivity.requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); } /**{@inheritDoc}*/ @Override public void onPostCreate(Bundle savedInstanceState) { mActivity.getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.actionbar_compat); setupActionBar(); SimpleMenu menu = new SimpleMenu(mActivity); mActivity.onCreatePanelMenu(Window.FEATURE_OPTIONS_PANEL, menu); mActivity.onPrepareOptionsMenu(menu); for (int i = 0; i < menu.size(); i++) { MenuItem item = menu.getItem(i); if (mActionItemIds.contains(item.getItemId())) { addActionItemCompatFromMenuItem(item); } } } /** * Sets up the compatibility action bar with the given title. */ private void setupActionBar() { final ViewGroup actionBarCompat = getActionBarCompat(); if (actionBarCompat == null) { return; } LinearLayout.LayoutParams springLayoutParams = new LinearLayout.LayoutParams( 0, ViewGroup.LayoutParams.FILL_PARENT); springLayoutParams.weight = 1; // Add Home button SimpleMenu tempMenu = new SimpleMenu(mActivity); SimpleMenuItem homeItem = new SimpleMenuItem( tempMenu, android.R.id.home, 0, mActivity.getString(R.string.app_name)); homeItem.setIcon(R.drawable.ic_home); addActionItemCompatFromMenuItem(homeItem); // Add title text TextView titleText = new TextView(mActivity, null, R.attr.actionbarCompatTitleStyle); titleText.setLayoutParams(springLayoutParams); titleText.setText(mActivity.getTitle()); actionBarCompat.addView(titleText); } /**{@inheritDoc}*/ @Override public void setRefreshActionItemState(boolean refreshing) { View refreshButton = mActivity.findViewById(R.id.actionbar_compat_item_refresh); View refreshIndicator = mActivity.findViewById( R.id.actionbar_compat_item_refresh_progress); if (refreshButton != null) { refreshButton.setVisibility(refreshing ? View.GONE : View.VISIBLE); } if (refreshIndicator != null) { refreshIndicator.setVisibility(refreshing ? View.VISIBLE : View.GONE); } } /** * Action bar helper code to be run in {@link Activity#onCreateOptionsMenu(android.view.Menu)}. * * NOTE: This code will mark on-screen menu items as invisible. */ @Override public boolean onCreateOptionsMenu(Menu menu) { // Hides on-screen action items from the options menu. for (Integer id : mActionItemIds) { menu.findItem(id).setVisible(false); } return true; } /**{@inheritDoc}*/ @Override protected void onTitleChanged(CharSequence title, int color) { TextView titleView = (TextView) mActivity.findViewById(R.id.actionbar_compat_title); if (titleView != null) { titleView.setText(title); } } /** * Returns a {@link android.view.MenuInflater} that can read action bar metadata on * pre-Honeycomb devices. */ public MenuInflater getMenuInflater(MenuInflater superMenuInflater) { return new WrappedMenuInflater(mActivity, superMenuInflater); } /** * Returns the {@link android.view.ViewGroup} for the action bar on phones (compatibility action * bar). Can return null, and will return null on Honeycomb. */ private ViewGroup getActionBarCompat() { return (ViewGroup) mActivity.findViewById(R.id.actionbar_compat); } /** * Adds an action button to the compatibility action bar, using menu information from a {@link * android.view.MenuItem}. If the menu item ID is <code>menu_refresh</code>, the menu item's * state can be changed to show a loading spinner using * {@link com.example.android.actionbarcompat.ActionBarHelperBase#setRefreshActionItemState(boolean)}. */ private View addActionItemCompatFromMenuItem(final MenuItem item) { final int itemId = item.getItemId(); final ViewGroup actionBar = getActionBarCompat(); if (actionBar == null) { return null; } // Create the button ImageButton actionButton = new ImageButton(mActivity, null, itemId == android.R.id.home ? R.attr.actionbarCompatItemHomeStyle : R.attr.actionbarCompatItemStyle); actionButton.setLayoutParams(new ViewGroup.LayoutParams( (int) mActivity.getResources().getDimension( itemId == android.R.id.home ? R.dimen.actionbar_compat_button_home_width : R.dimen.actionbar_compat_button_width), ViewGroup.LayoutParams.FILL_PARENT)); if (itemId == R.id.menu_refresh) { actionButton.setId(R.id.actionbar_compat_item_refresh); } actionButton.setImageDrawable(item.getIcon()); actionButton.setScaleType(ImageView.ScaleType.CENTER); actionButton.setContentDescription(item.getTitle()); actionButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { mActivity.onMenuItemSelected(Window.FEATURE_OPTIONS_PANEL, item); } }); actionBar.addView(actionButton); if (item.getItemId() == R.id.menu_refresh) { // Refresh buttons should be stateful, and allow for indeterminate progress indicators, // so add those. ProgressBar indicator = new ProgressBar(mActivity, null, R.attr.actionbarCompatProgressIndicatorStyle); final int buttonWidth = mActivity.getResources().getDimensionPixelSize( R.dimen.actionbar_compat_button_width); final int buttonHeight = mActivity.getResources().getDimensionPixelSize( R.dimen.actionbar_compat_height); final int progressIndicatorWidth = buttonWidth / 2; LinearLayout.LayoutParams indicatorLayoutParams = new LinearLayout.LayoutParams( progressIndicatorWidth, progressIndicatorWidth); indicatorLayoutParams.setMargins( (buttonWidth - progressIndicatorWidth) / 2, (buttonHeight - progressIndicatorWidth) / 2, (buttonWidth - progressIndicatorWidth) / 2, 0); indicator.setLayoutParams(indicatorLayoutParams); indicator.setVisibility(View.GONE); indicator.setId(R.id.actionbar_compat_item_refresh_progress); actionBar.addView(indicator); } return actionButton; } /** * A {@link android.view.MenuInflater} that reads action bar metadata. */ private class WrappedMenuInflater extends MenuInflater { MenuInflater mInflater; public WrappedMenuInflater(Context context, MenuInflater inflater) { super(context); mInflater = inflater; } @Override public void inflate(int menuRes, Menu menu) { loadActionBarMetadata(menuRes); mInflater.inflate(menuRes, menu); } /** * Loads action bar metadata from a menu resource, storing a list of menu item IDs that * should be shown on-screen (i.e. those with showAsAction set to always or ifRoom). * @param menuResId */ private void loadActionBarMetadata(int menuResId) { XmlResourceParser parser = null; try { parser = mActivity.getResources().getXml(menuResId); int eventType = parser.getEventType(); int itemId; int showAsAction; boolean eof = false; while (!eof) { switch (eventType) { case XmlPullParser.START_TAG: if (!parser.getName().equals("item")) { break; } itemId = parser.getAttributeResourceValue(MENU_RES_NAMESPACE, MENU_ATTR_ID, 0); if (itemId == 0) { break; } showAsAction = parser.getAttributeIntValue(MENU_RES_NAMESPACE, MENU_ATTR_SHOW_AS_ACTION, -1); if (showAsAction == MenuItem.SHOW_AS_ACTION_ALWAYS || showAsAction == MenuItem.SHOW_AS_ACTION_IF_ROOM) { mActionItemIds.add(itemId); } break; case XmlPullParser.END_DOCUMENT: eof = true; break; } eventType = parser.next(); } } catch (XmlPullParserException e) { throw new InflateException("Error inflating menu XML", e); } catch (IOException e) { throw new InflateException("Error inflating menu XML", e); } finally { if (parser != null) { parser.close(); } } } } }