自定义的 Action Bar

/* * Copyright (C) 2010 Johan Nilsson <http://markupartist.com> * * 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.nedu.android.widget; import java.util.LinkedList; import android.content.ActivityNotFoundException; import android.content.Context; import android.content.Intent; import android.content.res.TypedArray; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ProgressBar; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.Toast; import com.nedu.android.actionbar.example.R; public class ActionBar extends RelativeLayout implements OnClickListener { private LayoutInflater mInflater; private RelativeLayout mBarView; private ImageView mLogoView; private View mBackIndicator; //private View mHomeView; private TextView mTitleView; private LinearLayout mActionsView; private ImageButton mHomeBtn; private RelativeLayout mHomeLayout; private ProgressBar mProgress; public ActionBar(Context context, AttributeSet attrs) { super(context, attrs); mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); mBarView = (RelativeLayout) mInflater.inflate(R.layout.actionbar, null); addView(mBarView); mLogoView = (ImageView) mBarView.findViewById(R.id.actionbar_home_logo); mHomeLayout = (RelativeLayout) mBarView.findViewById(R.id.actionbar_home_bg); mHomeBtn = (ImageButton) mBarView.findViewById(R.id.actionbar_home_btn); mBackIndicator = mBarView.findViewById(R.id.actionbar_home_is_back); mTitleView = (TextView) mBarView.findViewById(R.id.actionbar_title); mActionsView = (LinearLayout) mBarView.findViewById(R.id.actionbar_actions); mProgress = (ProgressBar) mBarView.findViewById(R.id.actionbar_progress); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ActionBar); CharSequence title = a.getString(R.styleable.ActionBar_title); if (title != null) { setTitle(title); } a.recycle(); } public void setHomeAction(Action action) { mHomeBtn.setOnClickListener(this); mHomeBtn.setTag(action); mHomeBtn.setImageResource(action.getDrawable()); mHomeLayout.setVisibility(View.VISIBLE); } public void clearHomeAction() { mHomeLayout.setVisibility(View.GONE); } /** * Shows the provided logo to the left in the action bar. * * This is ment to be used instead of the setHomeAction and does not draw * a divider to the left of the provided logo. * * @param resId The drawable resource id */ public void setHomeLogo(int resId) { // TODO: Add possibility to add an IntentAction as well. mLogoView.setImageResource(resId); mLogoView.setVisibility(View.VISIBLE); mHomeLayout.setVisibility(View.GONE); } /* Emulating Honeycomb, setdisplayHomeAsUpEnabled takes a boolean * and toggles whether the "home" view should have a little triangle * indicating "up" */ public void setDisplayHomeAsUpEnabled(boolean show) { mBackIndicator.setVisibility(show? View.VISIBLE : View.GONE); } public void setTitle(CharSequence title) { mTitleView.setText(title); } public void setTitle(int resid) { mTitleView.setText(resid); } /** * Set the enabled state of the progress bar. * * @param One of {@link View#VISIBLE}, {@link View#INVISIBLE}, * or {@link View#GONE}. */ public void setProgressBarVisibility(int visibility) { mProgress.setVisibility(visibility); } /** * Returns the visibility status for the progress bar. * * @param One of {@link View#VISIBLE}, {@link View#INVISIBLE}, * or {@link View#GONE}. */ public int getProgressBarVisibility() { return mProgress.getVisibility(); } /** * Function to set a click listener for Title TextView * * @param listener the onClickListener */ public void setOnTitleClickListener(OnClickListener listener) { mTitleView.setOnClickListener(listener); } @Override public void onClick(View view) { final Object tag = view.getTag(); if (tag instanceof Action) { final Action action = (Action) tag; action.performAction(view); } } /** * Adds a list of {@link Action}s. * @param actionList the actions to add */ public void addActions(ActionList actionList) { int actions = actionList.size(); for (int i = 0; i < actions; i++) { addAction(actionList.get(i)); } } /** * Adds a new {@link Action}. * @param action the action to add */ public void addAction(Action action) { final int index = mActionsView.getChildCount(); addAction(action, index); } /** * Adds a new {@link Action} at the specified index. * @param action the action to add * @param index the position at which to add the action */ public void addAction(Action action, int index) { mActionsView.addView(inflateAction(action), index); } /** * Removes all action views from this action bar */ public void removeAllActions() { mActionsView.removeAllViews(); } /** * Remove a action from the action bar. * @param index position of action to remove */ public void removeActionAt(int index) { mActionsView.removeViewAt(index); } /** * Remove a action from the action bar. * @param action The action to remove */ public void removeAction(Action action) { int childCount = mActionsView.getChildCount(); for (int i = 0; i < childCount; i++) { View view = mActionsView.getChildAt(i); if (view != null) { final Object tag = view.getTag(); if (tag instanceof Action && tag.equals(action)) { mActionsView.removeView(view); } } } } /** * Returns the number of actions currently registered with the action bar. * @return action count */ public int getActionCount() { return mActionsView.getChildCount(); } /** * Inflates a {@link View} with the given {@link Action}. * @param action the action to inflate * @return a view */ private View inflateAction(Action action) { View view = mInflater.inflate(R.layout.actionbar_item, mActionsView, false); ImageButton labelView = (ImageButton) view.findViewById(R.id.actionbar_item); labelView.setImageResource(action.getDrawable()); view.setTag(action); view.setOnClickListener(this); return view; } /** * A {@link LinkedList} that holds a list of {@link Action}s. */ public static class ActionList extends LinkedList<Action> { } /** * Definition of an action that could be performed, along with a icon to * show. */ public interface Action { public int getDrawable(); public v