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Cache search suggestions temporarily so that repeated searches to not waste data requests

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This commit is contained in:
Anthony Restaino 2015-03-26 12:37:29 -04:00
parent 8b3da70d92
commit 1f1ed20a7e
1 changed files with 99 additions and 21 deletions
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120
src/acr/browser/lightning/SearchAdapter.java
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@ -1,5 +1,23 @@
package acr.browser.lightning;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
@ -10,17 +28,11 @@ import android.os.AsyncTask;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.*;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;
public class SearchAdapter extends BaseAdapter implements Filterable {
@ -31,12 +43,13 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
private List<HistoryItem> mAllBookmarks;
private HistoryDatabase mDatabaseHandler;
private SharedPreferences mPreferences;
private boolean mUseGoogle = true;
private Context mContext;
private boolean mUseGoogle = true;
private boolean mIsExecuting = false;
private boolean mIncognito;
private BookmarkManager mBookmarkManager;
private static final String ENCODING = "ISO-8859-1";
private static final long INTERVAL_DAY = 86400000;
private XmlPullParserFactory mFactory;
private XmlPullParser mXpp;
private String mSearchSubtitle;
@ -54,6 +67,38 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
mContext = context;
mSearchSubtitle = mContext.getString(R.string.suggestion);
mIncognito = incognito;
Thread delete = new Thread(new Runnable() {
@Override
public void run() {
deleteOldCacheFiles(mContext);
}
});
delete.start();
}
private void deleteOldCacheFiles(Context context) {
File dir = new File(context.getCacheDir().toString());
String[] fileList = dir.list(new NameFilter());
long earliestTimeAllowed = System.currentTimeMillis() - INTERVAL_DAY;
for (String fileName : fileList) {
File file = new File(dir.getPath() + fileName);
if (earliestTimeAllowed > file.lastModified()) {
file.delete();
}
}
}
private class NameFilter implements FilenameFilter {
private static final String ext = ".sgg";
@Override
public boolean accept(File dir, String filename) {
return filename.endsWith(ext);
}
}
public void refreshPreferences() {
@ -222,9 +267,7 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
@Override
protected List<HistoryItem> doInBackground(String... arg0) {
mIsExecuting = true;
if (!isNetworkConnected(mContext)) {
return new ArrayList<HistoryItem>();
}
List<HistoryItem> filter = new ArrayList<HistoryItem>();
String query = arg0[0];
try {
@ -233,10 +276,13 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
InputStream download = null;
File cache = downloadSuggestionsForQuery(query);
if (!cache.exists()) {
return filter;
}
InputStream fileInput = null;
try {
download = new java.net.URL("http://google.com/complete/search?q=" + query
+ "&output=toolbar&hl=en").openStream();
fileInput = new BufferedInputStream(new FileInputStream(cache));
if (mFactory == null) {
mFactory = XmlPullParserFactory.newInstance();
mFactory.setNamespaceAware(true);
@ -244,7 +290,7 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
if (mXpp == null) {
mXpp = mFactory.newPullParser();
}
mXpp.setInput(download, ENCODING);
mXpp.setInput(fileInput, ENCODING);
int eventType = mXpp.getEventType();
int counter = 0;
while (eventType != XmlPullParser.END_DOCUMENT) {
@ -262,9 +308,9 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
} catch (Exception e) {
return filter;
} finally {
if (download != null) {
if (fileInput != null) {
try {
download.close();
fileInput.close();
} catch (IOException e) {
e.printStackTrace();
}
@ -286,6 +332,38 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
}
private File downloadSuggestionsForQuery(String query) {
File cacheFile = new File(mContext.getCacheDir(), query.hashCode() + ".sgg");
if (System.currentTimeMillis() - INTERVAL_DAY < cacheFile.lastModified()) {
return cacheFile;
}
if (!isNetworkConnected(mContext)) {
return cacheFile;
}
try {
URL url = new URL("http://google.com/complete/search?q=" + query
+ "&output=toolbar&hl=en");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream in = connection.getInputStream();
if (in != null) {
FileOutputStream fos = new FileOutputStream(cacheFile);
int buffer;
while ((buffer = in.read()) != -1) {
fos.write(buffer);
}
fos.flush();
fos.close();
}
cacheFile.setLastModified(System.currentTimeMillis());
} catch (Exception e) {
e.printStackTrace();
}
return cacheFile;
}
private boolean isNetworkConnected(Context context) {
NetworkInfo networkInfo = getActiveNetworkInfo(context);
return networkInfo != null && networkInfo.isConnected();