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Fixing cache pruning to avoid pruning those in the visible range

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-> Improves flashing on rotation of stack widgets, or other widgets
   who's items use a lot of memory

Change-Id: I762b555ac1827861ed63ac5929972395f3080a0a
This commit is contained in:
Adam Cohen
2012-07-24 22:46:11 -07:00
parent c524ca275a
commit 591ff978e5
1 changed files with 53 additions and 34 deletions
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87
core/java/android/widget/RemoteViewsAdapter.java
View File

@@ -17,10 +17,10 @@
package android.widget;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import android.appwidget.AppWidgetManager;
import android.content.Context;
import android.content.Intent;
@@ -38,7 +38,6 @@ import android.view.LayoutInflater;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import android.widget.RemoteViewsService.RemoteViewsFactory;
import com.android.internal.widget.IRemoteViewsAdapterConnection;
import com.android.internal.widget.IRemoteViewsFactory;
@@ -532,10 +531,9 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
private static class RemoteViewsIndexMetaData implements Parcelable {
int typeId;
long itemId;
boolean isRequested;
public RemoteViewsIndexMetaData(RemoteViews v, long itemId, boolean requested) {
set(v, itemId, requested);
public RemoteViewsIndexMetaData(RemoteViews v, long itemId) {
set(v, itemId);
}
public RemoteViewsIndexMetaData(Parcel src) {
@@ -554,17 +552,14 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
return 0;
}
public void set(RemoteViews v, long id, boolean requested) {
public void set(RemoteViews v, long id) {
itemId = id;
if (v != null) {
typeId = v.getLayoutId();
} else {
typeId = 0;
}
isRequested = requested;
}
}
/**
@@ -683,10 +678,11 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
return 0;
}
public void insert(int position, RemoteViews v, long itemId, boolean isRequested) {
public void insert(int position, RemoteViews v, long itemId,
ArrayList<Integer> visibleWindow) {
// Trim the cache if we go beyond the count
if (mIndexRemoteViews.size() >= mMaxCount) {
mIndexRemoteViews.remove(getFarthestPositionFrom(position));
mIndexRemoteViews.remove(getFarthestPositionFrom(position, visibleWindow));
}
// Trim the cache if we go beyond the available memory size constraints
@@ -697,15 +693,15 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
// remove based on both its position as well as it's current memory usage, as well
// as whether it was directly requested vs. whether it was preloaded by our caching
// mechanism.
mIndexRemoteViews.remove(getFarthestPositionFrom(pruneFromPosition));
mIndexRemoteViews.remove(getFarthestPositionFrom(pruneFromPosition, visibleWindow));
}
// Update the metadata cache
if (mIndexMetaData.containsKey(position)) {
final RemoteViewsIndexMetaData metaData = mIndexMetaData.get(position);
metaData.set(v, itemId, isRequested);
metaData.set(v, itemId);
} else {
mIndexMetaData.put(position, new RemoteViewsIndexMetaData(v, itemId, isRequested));
mIndexMetaData.put(position, new RemoteViewsIndexMetaData(v, itemId));
}
mIndexRemoteViews.put(position, v);
}
@@ -748,29 +744,30 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
}
return mem;
}
private int getFarthestPositionFrom(int pos) {
private int getFarthestPositionFrom(int pos, ArrayList<Integer> visibleWindow) {
// Find the index farthest away and remove that
int maxDist = 0;
int maxDistIndex = -1;
int maxDistNonRequested = 0;
int maxDistIndexNonRequested = -1;
int maxDistNotVisible = 0;
int maxDistIndexNotVisible = -1;
for (int i : mIndexRemoteViews.keySet()) {
int dist = Math.abs(i-pos);
if (dist > maxDistNonRequested && !mIndexMetaData.get(i).isRequested) {
// maxDistNonRequested/maxDistIndexNonRequested will store the index of the
// farthest non-requested position
maxDistIndexNonRequested = i;
maxDistNonRequested = dist;
if (dist > maxDistNotVisible && !visibleWindow.contains(i)) {
// maxDistNotVisible/maxDistIndexNotVisible will store the index of the
// farthest non-visible position
maxDistIndexNotVisible = i;
maxDistNotVisible = dist;
}
if (dist >= maxDist) {
// maxDist/maxDistIndex will store the index of the farthest position
// regardless of whether it was directly requested or not
// regardless of whether it is visible or not
maxDistIndex = i;
maxDist = dist;
}
}
if (maxDistIndexNonRequested > -1) {
return maxDistIndexNonRequested;
if (maxDistIndexNotVisible > -1) {
return maxDistIndexNotVisible;
}
return maxDistIndex;
}
@@ -967,15 +964,13 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
if (mServiceConnection.isConnected()) {
// Get the next index to load
int position = -1;
boolean isRequested = false;
synchronized (mCache) {
int[] res = mCache.getNextIndexToLoad();
position = res[0];
isRequested = res[1] > 0;
}
if (position > -1) {
// Load the item, and notify any existing RemoteViewsFrameLayouts
updateRemoteViews(position, isRequested, true);
updateRemoteViews(position, true);
// Queue up for the next one to load
loadNextIndexInBackground();
@@ -1037,8 +1032,7 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
}
}
private void updateRemoteViews(final int position, boolean isRequested, boolean
notifyWhenLoaded) {
private void updateRemoteViews(final int position, boolean notifyWhenLoaded) {
IRemoteViewsFactory factory = mServiceConnection.getRemoteViewsFactory();
// Load the item information from the remote service
@@ -1070,13 +1064,17 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
int layoutId = remoteViews.getLayoutId();
RemoteViewsMetaData metaData = mCache.getMetaData();
boolean viewTypeInRange;
int cacheCount;
synchronized (metaData) {
viewTypeInRange = metaData.isViewTypeInRange(layoutId);
cacheCount = mCache.mMetaData.count;
}
synchronized (mCache) {
if (viewTypeInRange) {
ArrayList<Integer> visibleWindow = getVisibleWindow(mVisibleWindowLowerBound,
mVisibleWindowUpperBound, cacheCount);
// Cache the RemoteViews we loaded
mCache.insert(position, remoteViews, itemId, isRequested);
mCache.insert(position, remoteViews, itemId, visibleWindow);
// Notify all the views that we have previously returned for this index that
// there is new data for it.
@@ -1199,7 +1197,6 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
Context context = parent.getContext();
RemoteViews rv = mCache.getRemoteViewsAt(position);
RemoteViewsIndexMetaData indexMetaData = mCache.getMetaDataAt(position);
indexMetaData.isRequested = true;
int typeId = indexMetaData.typeId;
try {
@@ -1298,18 +1295,21 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
// Re-request the new metadata (only after the notification to the factory)
updateTemporaryMetaData();
int newCount;
ArrayList<Integer> visibleWindow;
synchronized(mCache.getTemporaryMetaData()) {
newCount = mCache.getTemporaryMetaData().count;
visibleWindow = getVisibleWindow(mVisibleWindowLowerBound,
mVisibleWindowUpperBound, newCount);
}
// Pre-load (our best guess of) the views which are currently visible in the AdapterView.
// This mitigates flashing and flickering of loading views when a widget notifies that
// its data has changed.
for (int i = mVisibleWindowLowerBound; i <= mVisibleWindowUpperBound; i++) {
for (int i: visibleWindow) {
// Because temporary meta data is only ever modified from this thread (ie.
// mWorkerThread), it is safe to assume that count is a valid representation.
if (i < newCount) {
updateRemoteViews(i, false, false);
updateRemoteViews(i, false);
}
}
@@ -1330,6 +1330,25 @@ public class RemoteViewsAdapter extends BaseAdapter implements Handler.Callback
mNotifyDataSetChangedAfterOnServiceConnected = false;
}
private ArrayList<Integer> getVisibleWindow(int lower, int upper, int count) {
ArrayList<Integer> window = new ArrayList<Integer>();
if (lower <= upper) {
for (int i = lower; i <= upper; i++){
window.add(i);
}
} else {
// If the upper bound is less than the lower bound it means that the visible window
// wraps around.
for (int i = lower; i < count; i++) {
window.add(i);
}
for (int i = 0; i <= upper; i++) {
window.add(i);
}
}
return window;
}
public void notifyDataSetChanged() {
// Dequeue any unbind messages
mMainQueue.removeMessages(sUnbindServiceMessageType);