initialize View Draw Listener - Android User Interface

Android examples for User Interface:View

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Description

initialize View Draw Listener

Demo Code

/*/*from  ww  w .  j a  va 2 s  .c  o m*/
 * Copyright (C) 2013 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.java2s;

import android.util.Log;
import android.view.View;

import android.view.ViewTreeObserver;

public class Main {
    private static final boolean DEBUG = false;
    private static ViewTreeObserver.OnDrawListener sGlobalDrawListener;
    private static long sGlobalFrameCounter;
    private static boolean sVisible;

    public static void initializeDrawListener(View view) {
        System.out
                .println("FirstFrameAnimatorHelper initializeDrawListenert");
        if (sGlobalDrawListener != null) {
            view.getViewTreeObserver().removeOnDrawListener(
                    sGlobalDrawListener);
        }
        sGlobalDrawListener = new ViewTreeObserver.OnDrawListener() {
            private long mTime = System.currentTimeMillis();

            public void onDraw() {
                sGlobalFrameCounter++;
                if (DEBUG) {
                    long newTime = System.currentTimeMillis();
                    Log.d("FirstFrameAnimatorHelper", "TICK "
                            + (newTime - mTime));
                    mTime = newTime;
                }
            }
        };
        view.getViewTreeObserver().addOnDrawListener(sGlobalDrawListener);
        sVisible = true;
    }
}

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