Android example source code file (ListMenuItemView.java)

This example Android source code file (ListMenuItemView.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, attributeset, checkbox, compoundbutton, content, context, drawable, drawing, gone, imageview, layoutinflater, linearlayout, listmenuitemview, menuitemimpl, radiobutton, textview, ui, view, visible, widget

The ListMenuItemView.java Android example source code

/*
 * 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.android.internal.view.menu;

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.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 int mMenuType;
    
    public ListMenuItemView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs);
    
        TypedArray a =
            context.obtainStyledAttributes(
                attrs, com.android.internal.R.styleable.MenuView, defStyle, 0);
        
        mBackground = a.getDrawable(com.android.internal.R.styleable.MenuView_itemBackground);
        mTextAppearance = a.getResourceId(com.android.internal.R.styleable.
                                          MenuView_itemTextAppearance, -1);
        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(com.android.internal.R.id.title);
        if (mTextAppearance != -1) {
            mTitleView.setTextAppearance(mTextAppearanceContext,
                                         mTextAppearance);
        }
        
        mShortcutView = (TextView) findViewById(com.android.internal.R.id.shortcut);
    }

    public void initialize(MenuItemImpl itemData, int menuType) {
        mItemData = itemData;
        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 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) {
        
        if (!mItemData.shouldShowIcon(mMenuType)) {
            return;
        }
        
        if (mIconView == null && icon == null) {
            return;
        }
        
        if (mIconView == null) {
            insertIconView();
        }
        
        if (icon != null) {
            mIconView.setImageDrawable(icon);

            if (mIconView.getVisibility() != VISIBLE) {
                mIconView.setVisibility(VISIBLE);
            }
        } else {
            mIconView.setVisibility(GONE);
        }
    }
    
    private void insertIconView() {
        LayoutInflater inflater = mItemData.getLayoutInflater(mMenuType);
        mIconView = (ImageView) inflater.inflate(com.android.internal.R.layout.list_menu_item_icon,
                this, false);
        addView(mIconView, 0);
    }
    
    private void insertRadioButton() {
        LayoutInflater inflater = mItemData.getLayoutInflater(mMenuType);
        mRadioButton =
                (RadioButton) inflater.inflate(com.android.internal.R.layout.list_menu_item_radio,
                this, false);
        addView(mRadioButton);
    }
    
    private void insertCheckBox() {
        LayoutInflater inflater = mItemData.getLayoutInflater(mMenuType);
        mCheckBox =
                (CheckBox) inflater.inflate(com.android.internal.R.layout.list_menu_item_checkbox,
                this, false);
        addView(mCheckBox);
    }

    public boolean prefersCondensedTitle() {
        return false;
    }

    public boolean showsIcon() {
        return false;
    }
    
}