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Add ActionBarCompat sample (CL 1 of 2)

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Change-Id: Ie41aee3fc805bf73ef0cd673049fcb608b59275c
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Roman Nurik
2011-09-30 15:40:22 -07:00
parent e8916f1ec0
commit 7ee7d6d5d6
47 changed files with 1633 additions and 0 deletions
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samples/ActionBarCompat/src/com/example/android/actionbarcompat/ActionBarHelperBase.java Normal file
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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 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();
}
}
}
}
}