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Load cached images in the background to avoid stalling the UI thread

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This commit is contained in:
Cameron Gutman 2015-01-31 16:59:45 -05:00
parent 23ca62b304
commit baa5199b83
1 changed files with 81 additions and 45 deletions
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126
app/src/main/java/com/limelight/grid/AppGridAdapter.java
View File

@ -3,6 +3,8 @@ package com.limelight.grid;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
@ -34,6 +36,7 @@ import java.security.SecureRandom;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.Future;
@ -155,16 +158,6 @@ public class AppGridAdapter extends GenericGridAdapter<AppView.AppObject> {
}
}
private Bitmap checkBitmapCache(int appId) {
try {
InputStream in = CacheHelper.openCacheFileForInput(context.getCacheDir(), "boxart", computer.uuid.toString(), appId+".png");
Bitmap bm = BitmapFactory.decodeStream(in);
in.close();
return bm;
} catch (IOException e) {}
return null;
}
// TODO: Handle pruning of bitmap cache
private void populateBitmapCache(UUID uuid, int appId, Bitmap bitmap) {
try {
@ -184,42 +177,11 @@ public class AppGridAdapter extends GenericGridAdapter<AppView.AppObject> {
Ion.getDefault(imgView.getContext()).getHttpClient().getSSLSocketMiddleware().setTrustManagers(trustAllCerts);
Ion.getDefault(imgView.getContext()).getHttpClient().getSSLSocketMiddleware().setSSLContext(sslContext);
// Hide the image view while we're loading the image from cache
imgView.setVisibility(View.INVISIBLE);
// Check the on-disk cache
Bitmap cachedBitmap = checkBitmapCache(obj.app.getAppId());
if (cachedBitmap != null) {
// Cache hit; we're done
LimeLog.info("Image cache hit for ("+computer.uuid+", "+obj.app.getAppId()+")");
imgView.setImageBitmap(cachedBitmap);
return true;
}
// Kick off the deferred image load
synchronized (pendingRequests) {
Future<ImageViewBitmapInfo> f = Ion.with(imgView)
.placeholder(defaultImageRes)
.error(defaultImageRes)
.load("https://" + getCurrentAddress().getHostAddress() + ":47984/appasset?uniqueid=" + uniqueId + "&appid=" +
obj.app.getAppId() + "&AssetType=2&AssetIdx=0")
.withBitmapInfo()
.setCallback(
new FutureCallback<ImageViewBitmapInfo>() {
@Override
public void onCompleted(Exception e, ImageViewBitmapInfo result) {
synchronized (pendingRequests) {
pendingRequests.remove(imgView);
}
// Populate the cache if we got an image back
if (result != null &&
result.getBitmapInfo() != null &&
result.getBitmapInfo().bitmap != null) {
populateBitmapCache(computer.uuid, obj.app.getAppId(),
result.getBitmapInfo().bitmap);
}
}
});
pendingRequests.put(imgView, f);
}
new ImageCacheRequest(imgView, obj.app.getAppId()).execute();
return true;
}
@ -244,4 +206,78 @@ public class AppGridAdapter extends GenericGridAdapter<AppView.AppObject> {
// No overlay
return false;
}
private class ImageCacheRequest extends AsyncTask<Void, Void, Bitmap> {
private ImageView view;
private int appId;
public ImageCacheRequest(ImageView view, int appId) {
this.view = view;
this.appId = appId;
}
@Override
protected Bitmap doInBackground(Void... v) {
InputStream in = null;
try {
in = CacheHelper.openCacheFileForInput(context.getCacheDir(), "boxart", computer.uuid.toString(), appId + ".png");
Bitmap bm = BitmapFactory.decodeStream(in);
in.close();
return bm;
} catch (IOException e) {
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {}
}
}
return null;
}
@Override
protected void onPostExecute(Bitmap result) {
if (result != null) {
// Cache was read successfully
LimeLog.info("Image cache hit for ("+computer.uuid+", "+appId+")");
view.setImageBitmap(result);
view.setVisibility(View.VISIBLE);
}
else {
LimeLog.info("Image cache miss for ("+computer.uuid+", "+appId+")");
// Kick off the deferred image load
synchronized (pendingRequests) {
Future<ImageViewBitmapInfo> f = Ion.with(view)
.placeholder(defaultImageRes)
.error(defaultImageRes)
.load("https://" + getCurrentAddress().getHostAddress() + ":47984/appasset?uniqueid=" + uniqueId + "&appid=" +
appId + "&AssetType=2&AssetIdx=0")
.withBitmapInfo()
.setCallback(
new FutureCallback<ImageViewBitmapInfo>() {
@Override
public void onCompleted(Exception e, ImageViewBitmapInfo result) {
view.setVisibility(View.VISIBLE);
synchronized (pendingRequests) {
pendingRequests.remove(view);
}
// Populate the cache if we got an image back
if (result != null &&
result.getBitmapInfo() != null &&
result.getBitmapInfo().bitmap != null) {
populateBitmapCache(computer.uuid, appId,
result.getBitmapInfo().bitmap);
}
}
});
pendingRequests.put(view, f);
}
}
}
};
}