Created
January 28, 2014 14:12
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Fixed ContentLoadingProgressbar
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/* | |
* 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 foo.bar; | |
import android.content.Context; | |
import android.util.AttributeSet; | |
import android.view.View; | |
import android.widget.ProgressBar; | |
/** | |
* ContentLoadingProgressBar implements a ProgressBar that waits a minimum time to be | |
* dismissed before showing. Once visible, the progress bar will be visible for | |
* a minimum amount of time to avoid "flashes" in the UI when an event could take | |
* a largely variable time to complete (from none, to a user perceivable amount) | |
*/ | |
public class ContentLoadingProgressBar extends ProgressBar { | |
private static final int MIN_SHOW_TIME = 500; // ms | |
private static final int MIN_DELAY = 500; // ms | |
private long mStartTime = -1; | |
private boolean mPostedHide = false; | |
private boolean mPostedShow = false; | |
private boolean mDismissed = false; | |
private final Runnable mDelayedHide = new Runnable() { | |
@Override | |
public void run() { | |
mPostedHide = false; | |
mStartTime = -1; | |
setVisibility(View.GONE); | |
} | |
}; | |
private final Runnable mDelayedShow = new Runnable() { | |
@Override | |
public void run() { | |
mPostedShow = false; | |
if (!mDismissed) { | |
mStartTime = System.currentTimeMillis(); | |
setVisibility(View.VISIBLE); | |
} | |
} | |
}; | |
public ContentLoadingProgressBar(Context context) { | |
super(context); | |
} | |
public ContentLoadingProgressBar(Context context, AttributeSet attrs) { | |
super(context, attrs); | |
} | |
public ContentLoadingProgressBar(Context context, AttributeSet attrs, int defStyle) { | |
super(context, attrs, defStyle); | |
} | |
@Override | |
public void onDetachedFromWindow() { | |
super.onDetachedFromWindow(); | |
removeCallbacks(); | |
} | |
private void removeCallbacks() { | |
removeCallbacks(mDelayedHide); | |
removeCallbacks(mDelayedShow); | |
} | |
/** | |
* Hide the progress view if it is visible. The progress view will not be | |
* hidden until it has been shown for at least a minimum show time. If the | |
* progress view was not yet visible, cancels showing the progress view. | |
*/ | |
public void hide() { | |
mDismissed = true; | |
removeCallbacks(mDelayedShow); | |
long diff = System.currentTimeMillis() - mStartTime; | |
if (diff >= MIN_SHOW_TIME || mStartTime == -1) { | |
// The progress spinner has been shown long enough | |
// OR was not shown yet. If it wasn't shown yet, | |
// it will just never be shown. | |
setVisibility(View.GONE); | |
} else { | |
// The progress spinner is shown, but not long enough, | |
// so put a delayed message in to hide it when its been | |
// shown long enough. | |
if (!mPostedHide) { | |
postDelayed(mDelayedHide, MIN_SHOW_TIME - diff); | |
mPostedHide = true; | |
} | |
} | |
} | |
/** | |
* Show the progress view after waiting for a minimum delay. If | |
* during that time, hide() is called, the view is never made visible. | |
*/ | |
public void show() { | |
// Reset the start time. | |
mStartTime = -1; | |
mDismissed = false; | |
removeCallbacks(mDelayedHide); | |
if (!mPostedShow) { | |
postDelayed(mDelayedShow, MIN_DELAY); | |
mPostedShow = true; | |
} | |
} | |
} |
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