Thank you for reply,,
I want to save the history for my application in a file on sdcard.
First i tried to save it as xml and parse it to load...but these actions
take a lot of time..(almost 8 seconds for 20 strings on a HTC Hero device);
this is the code:
package com.app.lookitup2;
import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.http.util.ByteArrayBuffer;
import android.content.Context;
import android.os.Environment;
import android.util.Log;
public class HistoryManager
{
private ArrayList<HistoryItem> history_items;
private Context context;
private final String WHAT_TAG_START = "<what>";
private final String WHAT_TAG_END = "</what>";
private final String WHERE_TAG_START = "<where>";
private final String WHERE_TAG_END = "</where>";
private final String DATE_TAG_START = "<date>";
private final String DATE_TAG_END = "</date>";
private final String ITEM_TAG_START = "<item>";
private final String ITEM_TAG_END = "</item>";
public HistoryManager(Context ctx)
{
context = ctx;
history_items = new ArrayList<HistoryItem>();
}
public void addHistoryItem(HistoryItem h_item)
{
history_items.add(h_item);
}
public HistoryItem getHistoryItem(int position)
{
return history_items.get(position);
}
public boolean saveHistory()
{
String data;
int i;
File root = Environment.getExternalStorageDirectory();
File history_file = new File(root,"history_lookitup.xml");
if(history_file.length() >= 1048576)
{
Log.e("SAVE_HISTORY","History is full!Please empty!");
return false;
}
data = new String("");
for(i = 0; i < history_items.size(); i++)
{
data = data + ITEM_TAG_START +
WHAT_TAG_START +
history_items.get(i).getWhat().getText().toString() + WHAT_TAG_END +
WHERE_TAG_START +
history_items.get(i).getWhere().getText().toString() + WHERE_TAG_END +
DATE_TAG_START +
history_items.get(i).getDate().toString() + DATE_TAG_END +
ITEM_TAG_END;
}
try
{
if(root.canWrite())
{
FileWriter history_writer = new
FileWriter(history_file,true);
BufferedWriter out = new BufferedWriter(history_writer);
out.write(data);
out.close();
Log.e("SAVE HISTORY","History is saved");
return true;
}
else
{
Log.e("SAVE HISTORY","no sd card or no permission to write
on it");
return false;
}
} catch (IOException e)
{
Log.e("WRITE FILE","Could not write file " + e.getMessage());
return false;
}
}
public boolean loadHistory() throws IOException
{
String myString = " ";
ArrayList<HistoryItem> items;
FileInputStream is;
try {
is = new FileInputStream("/sdcard/history_lookitup.xml");
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayBuffer baf = new ByteArrayBuffer(50);
int current = 0;
while((current = bis.read()) != -1)
baf.append((byte)current);
myString = new String(baf.toByteArray());
if(myString.equals(" ") == false)
{
HistoryParser parser = new HistoryParser("<?xml
version='1.0' encoding='UTF-8'?><main>" + myString + "</main>",context);
items = new ArrayList<HistoryItem>();
items = parser.getItemList();
Log.e("FIRST_HISTORY", items.get(0).getDate().toString());
Log.e("DATA",myString);
history_items = items;
Log.e("history_items =
",Integer.toString(history_items.size()));
return true;
}
else
return false;
} catch (FileNotFoundException e)
{
e.printStackTrace();
return false;
}
}
public int getCount()
{
return history_items.size();
}
public ArrayList<HistoryItem> getHistoryList()
{
return history_items;
}
public void clearHistory() throws IOException
{
File root = Environment.getExternalStorageDirectory();
File history_file = new File(root,"history_lookitup.xml");
if(root.canWrite())
{
FileWriter history_writer = new FileWriter(history_file);
BufferedWriter out = new BufferedWriter(history_writer);
out.write(" ");
out.close();
Log.e("Clear HISTORY","History is empty now");
loadHistory();
}
}
I tried to use sharedPreference ..i put all the strings in preference:the
saving time was good..but when i try to load it i got same problem...
Thank you
}
>
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