Android example source code file (IconMerger.java)

This example Android source code file (IconMerger.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, content, gone, handler, iconmerger, linearlayout, os, override, runnable, runtimeexception, status, statusbaricon, statusbarservice, ui, util, utilities, view

The IconMerger.java Android example source code

/*
 * Copyright (C) 2008 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.server.status;

import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;


public class IconMerger extends LinearLayout {
    StatusBarService service;
    StatusBarIcon moreIcon;

    public IconMerger(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);

        final int maxWidth = r - l;
        final int N = getChildCount();
        int i;

        // get the rightmost one, and see if we even need to do anything
        int fitRight = -1;
        for (i=N-1; i>=0; i--) {
            final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                fitRight = child.getRight();
                break;
            }
        }

        // find the first visible one that isn't the more icon
        View moreView = null;
        int fitLeft = -1;
        int startIndex = -1;
        for (i=0; i<N; i++) {
            final View child = getChildAt(i);
            if (com.android.internal.R.drawable.stat_notify_more == child.getId()) {
                moreView = child;
                startIndex = i+1;
            }
            else if (child.getVisibility() != GONE) {
                fitLeft = child.getLeft();
                break;
            }
        }

        if (moreView == null || startIndex < 0) {
            throw new RuntimeException("Status Bar / IconMerger moreView == null");
        }
        
        // if it fits without the more icon, then hide the more icon and update fitLeft
        // so everything gets pushed left
        int adjust = 0;
        if (fitRight - fitLeft <= maxWidth) {
            adjust = fitLeft - moreView.getLeft();
            fitLeft -= adjust;
            fitRight -= adjust;
            moreView.layout(0, moreView.getTop(), 0, moreView.getBottom());
        }
        int extra = fitRight - r;
        int shift = -1;

        int breakingPoint = fitLeft + extra + adjust;
        int number = 0;
        for (i=startIndex; i<N; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                int childLeft = child.getLeft();
                int childRight = child.getRight();
                if (childLeft < breakingPoint) {
                    // hide this one
                    child.layout(0, child.getTop(), 0, child.getBottom());
                    int n = this.service.getIconNumberForView(child);
                    if (n == 0) {
                        number += 1;
                    } else if (n > 0) {
                        number += n;
                    }
                } else {
                    // decide how much to shift by
                    if (shift < 0) {
                        shift = childLeft - fitLeft;
                    }
                    // shift this left by shift
                    child.layout(childLeft-shift, child.getTop(),
                                    childRight-shift, child.getBottom());
                }
            }
        }
        
        // BUG: Updating the text during the layout here doesn't seem to cause
        // the view to be redrawn fully.  The text view gets resized correctly, but the
        // text contents aren't drawn properly.  To work around this, we post a message
        // and provide the value later.  We're the only one changing this value show it
        // should be ordered correctly.
        if (false) {
            this.moreIcon.update(number);
        } else {
            mBugWorkaroundNumber = number;
            mBugWorkaroundHandler.post(mBugWorkaroundRunnable);
        }
    }

    private int mBugWorkaroundNumber;
    private Handler mBugWorkaroundHandler = new Handler();
    private Runnable mBugWorkaroundRunnable = new Runnable() {
        public void run() {
            IconMerger.this.moreIcon.update(mBugWorkaroundNumber);
            IconMerger.this.moreIcon.view.invalidate();
        }
    };
}