Android example source code file (StatusBarView.java)

This example Android source code file (StatusBarView.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, dim_anim_time, drawing, fixedsizedrawable, framelayout, os, override, paint, runtimeexception, statusbarservice, statusbarview, string, tag, ui, view, viewgroup, viewparent

The StatusBarView.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.content.res.Configuration;
import android.graphics.Canvas;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.FrameLayout;

import com.android.internal.R;

public class StatusBarView extends FrameLayout {
    private static final String TAG = "StatusBarView";

    static final int DIM_ANIM_TIME = 400;
    
    StatusBarService mService;
    boolean mTracking;
    int mStartX, mStartY;
    ViewGroup mNotificationIcons;
    ViewGroup mStatusIcons;
    View mDate;
    FixedSizeDrawable mBackground;
    
    boolean mNightMode = false;
    int mStartAlpha = 0, mEndAlpha = 0;
    long mEndTime = 0;

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

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mNotificationIcons = (ViewGroup)findViewById(R.id.notificationIcons);
        mStatusIcons = (ViewGroup)findViewById(R.id.statusIcons);
        mDate = findViewById(R.id.date);

        mBackground = new FixedSizeDrawable(mDate.getBackground());
        mBackground.setFixedBounds(0, 0, 0, 0);
        mDate.setBackgroundDrawable(mBackground);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        mService.onBarViewAttached();
    }
    
    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        boolean nightMode = (newConfig.uiMode & Configuration.UI_MODE_NIGHT_MASK)
                == Configuration.UI_MODE_NIGHT_YES;
        if (mNightMode != nightMode) {
            mNightMode = nightMode;
            mStartAlpha = getCurAlpha();
            mEndAlpha = mNightMode ? 0x80 : 0x00;
            mEndTime = SystemClock.uptimeMillis() + DIM_ANIM_TIME;
            invalidate();
        }
    }

    int getCurAlpha() {
        long time = SystemClock.uptimeMillis();
        if (time > mEndTime) {
            return mEndAlpha;
        }
        return mEndAlpha
                - (int)(((mEndAlpha-mStartAlpha) * (mEndTime-time) / DIM_ANIM_TIME));
    }
    
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mService.updateExpandedViewPos(StatusBarService.EXPANDED_LEAVE_ALONE);
    }

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

        // put the date date view quantized to the icons
        int oldDateRight = mDate.getRight();
        int newDateRight;

        newDateRight = getDateSize(mNotificationIcons, oldDateRight,
                getViewOffset(mNotificationIcons));
        if (newDateRight < 0) {
            int offset = getViewOffset(mStatusIcons);
            if (oldDateRight < offset) {
                newDateRight = oldDateRight;
            } else {
                newDateRight = getDateSize(mStatusIcons, oldDateRight, offset);
                if (newDateRight < 0) {
                    newDateRight = r;
                }
            }
        }
        int max = r - getPaddingRight();
        if (newDateRight > max) {
            newDateRight = max;
        }

        mDate.layout(mDate.getLeft(), mDate.getTop(), newDateRight, mDate.getBottom());
        mBackground.setFixedBounds(-mDate.getLeft(), -mDate.getTop(), (r-l), (b-t));
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        int alpha = getCurAlpha();
        if (alpha != 0) {
            canvas.drawARGB(alpha, 0, 0, 0);
        }
        if (alpha != mEndAlpha) {
            invalidate();
        }
    }

    /**
     * Gets the left position of v in this view.  Throws if v is not
     * a child of this.
     */
    private int getViewOffset(View v) {
        int offset = 0;
        while (v != this) {
            offset += v.getLeft();
            ViewParent p = v.getParent();
            if (v instanceof View) {
                v = (View)p;
            } else {
                throw new RuntimeException(v + " is not a child of " + this);
            }
        }
        return offset;
    }

    private int getDateSize(ViewGroup g, int w, int offset) {
        final int N = g.getChildCount();
        for (int i=0; i<N; i++) {
            View v = g.getChildAt(i);
            int l = v.getLeft() + offset;
            int r = v.getRight() + offset;
            if (w >= l && w <= r) {
                return r;
            }
        }
        return -1;
    }

    /**
     * Ensure that, if there is no target under us to receive the touch,
     * that we process it ourself.  This makes sure that onInterceptTouchEvent()
     * is always called for the entire gesture.
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() != MotionEvent.ACTION_DOWN) {
            mService.interceptTouchEvent(event);
        }
        return true;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        return mService.interceptTouchEvent(event)
                ? true : super.onInterceptTouchEvent(event);
    }
}