Java tutorial
/* 50AH-code ========= 50 Android Hacks (http://manning.com/sessa/) book source code Copyright (c) 2012 Manning Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* * Copyright (C) 2006 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.actionbarsherlock.internal.view.menu; import com.actionbarsherlock.R; import android.content.Context; import android.content.res.TypedArray; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RadioButton; import android.widget.TextView; /** * The item view for each item in the ListView-based MenuViews. */ public class ListMenuItemView extends LinearLayout implements MenuView.ItemView { private MenuItemImpl mItemData; private ImageView mIconView; private RadioButton mRadioButton; private TextView mTitleView; private CheckBox mCheckBox; private TextView mShortcutView; private Drawable mBackground; private int mTextAppearance; private Context mTextAppearanceContext; private boolean mPreserveIconSpacing; //UNUSED private int mMenuType; private LayoutInflater mInflater; private boolean mForceShowIcon; final Context mContext; public ListMenuItemView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs); mContext = context; TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SherlockMenuView, defStyle, 0); mBackground = a.getDrawable(R.styleable.SherlockMenuView_itemBackground); mTextAppearance = a.getResourceId(R.styleable.SherlockMenuView_itemTextAppearance, -1); mPreserveIconSpacing = a.getBoolean(R.styleable.SherlockMenuView_preserveIconSpacing, false); mTextAppearanceContext = context; a.recycle(); } public ListMenuItemView(Context context, AttributeSet attrs) { this(context, attrs, 0); } @Override protected void onFinishInflate() { super.onFinishInflate(); setBackgroundDrawable(mBackground); mTitleView = (TextView) findViewById(R.id.abs__title); if (mTextAppearance != -1) { mTitleView.setTextAppearance(mTextAppearanceContext, mTextAppearance); } mShortcutView = (TextView) findViewById(R.id.abs__shortcut); } public void initialize(MenuItemImpl itemData, int menuType) { mItemData = itemData; //UNUSED mMenuType = menuType; setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE); setTitle(itemData.getTitleForItemView(this)); setCheckable(itemData.isCheckable()); setShortcut(itemData.shouldShowShortcut(), itemData.getShortcut()); setIcon(itemData.getIcon()); setEnabled(itemData.isEnabled()); } public void setForceShowIcon(boolean forceShow) { mPreserveIconSpacing = mForceShowIcon = forceShow; } public void setTitle(CharSequence title) { if (title != null) { mTitleView.setText(title); if (mTitleView.getVisibility() != VISIBLE) mTitleView.setVisibility(VISIBLE); } else { if (mTitleView.getVisibility() != GONE) mTitleView.setVisibility(GONE); } } public MenuItemImpl getItemData() { return mItemData; } public void setCheckable(boolean checkable) { if (!checkable && mRadioButton == null && mCheckBox == null) { return; } if (mRadioButton == null) { insertRadioButton(); } if (mCheckBox == null) { insertCheckBox(); } // Depending on whether its exclusive check or not, the checkbox or // radio button will be the one in use (and the other will be otherCompoundButton) final CompoundButton compoundButton; final CompoundButton otherCompoundButton; if (mItemData.isExclusiveCheckable()) { compoundButton = mRadioButton; otherCompoundButton = mCheckBox; } else { compoundButton = mCheckBox; otherCompoundButton = mRadioButton; } if (checkable) { compoundButton.setChecked(mItemData.isChecked()); final int newVisibility = checkable ? VISIBLE : GONE; if (compoundButton.getVisibility() != newVisibility) { compoundButton.setVisibility(newVisibility); } // Make sure the other compound button isn't visible if (otherCompoundButton.getVisibility() != GONE) { otherCompoundButton.setVisibility(GONE); } } else { mCheckBox.setVisibility(GONE); mRadioButton.setVisibility(GONE); } } public void setChecked(boolean checked) { CompoundButton compoundButton; if (mItemData.isExclusiveCheckable()) { if (mRadioButton == null) { insertRadioButton(); } compoundButton = mRadioButton; } else { if (mCheckBox == null) { insertCheckBox(); } compoundButton = mCheckBox; } compoundButton.setChecked(checked); } public void setShortcut(boolean showShortcut, char shortcutKey) { final int newVisibility = (showShortcut && mItemData.shouldShowShortcut()) ? VISIBLE : GONE; if (newVisibility == VISIBLE) { mShortcutView.setText(mItemData.getShortcutLabel()); } if (mShortcutView.getVisibility() != newVisibility) { mShortcutView.setVisibility(newVisibility); } } public void setIcon(Drawable icon) { final boolean showIcon = mItemData.shouldShowIcon() || mForceShowIcon; if (!showIcon && !mPreserveIconSpacing) { return; } if (mIconView == null && icon == null && !mPreserveIconSpacing) { return; } if (mIconView == null) { insertIconView(); } if (icon != null || mPreserveIconSpacing) { mIconView.setImageDrawable(showIcon ? icon : null); if (mIconView.getVisibility() != VISIBLE) { mIconView.setVisibility(VISIBLE); } } else { mIconView.setVisibility(GONE); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (mIconView != null && mPreserveIconSpacing) { // Enforce minimum icon spacing ViewGroup.LayoutParams lp = getLayoutParams(); LayoutParams iconLp = (LayoutParams) mIconView.getLayoutParams(); if (lp.height > 0 && iconLp.width <= 0) { iconLp.width = lp.height; } } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } private void insertIconView() { LayoutInflater inflater = getInflater(); mIconView = (ImageView) inflater.inflate(R.layout.abs__list_menu_item_icon, this, false); addView(mIconView, 0); } private void insertRadioButton() { LayoutInflater inflater = getInflater(); mRadioButton = (RadioButton) inflater.inflate(R.layout.abs__list_menu_item_radio, this, false); addView(mRadioButton); } private void insertCheckBox() { LayoutInflater inflater = getInflater(); mCheckBox = (CheckBox) inflater.inflate(R.layout.abs__list_menu_item_checkbox, this, false); addView(mCheckBox); } public boolean prefersCondensedTitle() { return false; } public boolean showsIcon() { return mForceShowIcon; } private LayoutInflater getInflater() { if (mInflater == null) { mInflater = LayoutInflater.from(mContext); } return mInflater; } }