I am programming a app that has to do a operation with high cpu usage on a longer time
the operation is startet like a service
but the android system kills the app because of the high cpu usage
so what can I do to reduce the cpu usage ?
and make the system not to stop my service ?
service :
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import android.app.Service;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.os.IBinder;
import android.provider.ContactsContract;
public class backup_service extends Service {
int i;
int i2;
@Override
public void onCreate() {
try
{
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/dialog.db");
BufferedWriter out = new BufferedWriter(fstream);
out.write("on");
//Close the output stream
out.close();
backup();
}
catch (Exception x)
{
stopSelf();
}
}
@Override
public void onDestroy() {
util.deleteDir(new File("/data/data/contact.backup.alexander.fuchs/dialog.db"));
stopSelf();
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
public void backup()
{
util.deleteDir(new File("/data/data/contact.backup.alexander.fuchs/backup/"));
new File("/data/data/contact.backup.alexander.fuchs/backup/").mkdirs();
// get it
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
null, null, null, null);
if (cur.getCount() > 0) {
i = 0;
i2 = 0;
while (cur.moveToNext()) {
String id = cur.getString(
cur.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(
cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
// write
try
{
new File("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)).mkdirs();
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/id.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(id);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/name.txt");
out = new BufferedWriter(fstream);
out.write(name);
//Close the output stream
out.close();
}
catch (Exception x)
{
}
if (Integer.parseInt(cur.getString(
cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
Cursor pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",
new String[]{id}, null);
while (pCur.moveToNext()) {
String number = pCur.getString(
pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
try
{
new File("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)).mkdirs();
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/number.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(number);
//Close the output stream
out.close();
}
catch(Exception x)
{
}
}
pCur.close();
Cursor emailCur = cr.query(
ContactsContract.CommonDataKinds.Email.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?",
new String[]{id}, null);
while (emailCur.moveToNext()) {
// This would allow you get several email addresses
// if the email addresses were stored in an array
String email = emailCur.getString(
emailCur.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
String emailType = emailCur.getString(
emailCur.getColumnIndex(ContactsContract.CommonDataKinds.Email.TYPE));
try
{
new File("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)).mkdirs();
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/email.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(email);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/email_type.txt");
out = new BufferedWriter(fstream);
out.write(emailType);
//Close the output stream
out.close();
}
catch(Exception x)
{
}
}
emailCur.close();
String noteWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";
String[] noteWhereParams = new String[]{id,
ContactsContract.CommonDataKinds.Note.CONTENT_ITEM_TYPE};
Cursor noteCur = cr.query(ContactsContract.Data.CONTENT_URI, null, noteWhere, noteWhereParams, null);
if (noteCur.moveToFirst()) {
String note = noteCur.getString(noteCur.getColumnIndex(ContactsContract.CommonDataKinds.Note.NOTE));
// write
try
{
new File("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)).mkdirs();
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/note.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(note);
//Close the output stream
out.close();
}
catch (Exception x)
{
}
}
noteCur.close();
String addrWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";
String[] addrWhereParams = new String[]{id,
ContactsContract.CommonDataKinds.StructuredPostal.CONTENT_ITEM_TYPE};
Cursor addrCur = cr.query(ContactsContract.Data.CONTENT_URI,
null, null, null, null);
while(addrCur.moveToNext()) {
String poBox = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.POBOX));
String street = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.STREET));
String city = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.CITY));
String state = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.REGION));
String postalCode = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.POSTCODE));
String country = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.COUNTRY));
String type = addrCur.getString(
addrCur.getColumnIndex(ContactsContract.CommonDataKinds.StructuredPostal.TYPE));
// write
try
{
new File("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)).mkdirs();
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/pobox.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(poBox);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/street.txt");
out = new BufferedWriter(fstream);
out.write(street);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/city.txt");
out = new BufferedWriter(fstream);
out.write(city);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/state.txt");
out = new BufferedWriter(fstream);
out.write(state);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/postalcode.txt");
out = new BufferedWriter(fstream);
out.write(postalCode);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/country.txt");
out = new BufferedWriter(fstream);
out.write(country);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"addres_type.txt");
out = new BufferedWriter(fstream);
out.write(type);
//Close the output stream
out.close();
}
catch (Exception x)
{
}
}
addrCur.close();
String imWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";
String[] imWhereParams = new String[]{id,
ContactsContract.CommonDataKinds.Im.CONTENT_ITEM_TYPE};
Cursor imCur = cr.query(ContactsContract.Data.CONTENT_URI,
null, imWhere, imWhereParams, null);
if (imCur.moveToFirst()) {
String imName = imCur.getString(
imCur.getColumnIndex(ContactsContract.CommonDataKinds.Im.DATA));
String imType;
imType = imCur.getString(
imCur.getColumnIndex(ContactsContract.CommonDataKinds.Im.TYPE));
//write
try
{
new File("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)).mkdirs();
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/im.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(imName);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/im_type.txt");
out = new BufferedWriter(fstream);
out.write(imType);
//Close the output stream
out.close();
}
catch(Exception x)
{
}
}
imCur.close();
String orgWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";
String[] orgWhereParams = new String[]{id,
ContactsContract.CommonDataKinds.Organization.CONTENT_ITEM_TYPE};
Cursor orgCur = cr.query(ContactsContract.Data.CONTENT_URI,
null, orgWhere, orgWhereParams, null);
if (orgCur.moveToFirst()) {
String orgName = orgCur.getString(orgCur.getColumnIndex(ContactsContract.CommonDataKinds.Organization.DATA));
String title = orgCur.getString(orgCur.getColumnIndex(ContactsContract.CommonDataKinds.Organization.TITLE));
String company = orgCur.getString(orgCur.getColumnIndex(ContactsContract.CommonDataKinds.Organization.COMPANY));
String department = orgCur.getString(orgCur.getColumnIndex(ContactsContract.CommonDataKinds.Organization.DEPARTMENT));
//write
try
{
new File("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)).mkdirs();
FileWriter fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/orgName.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(orgName);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/title.txt");
out = new BufferedWriter(fstream);
out.write(title);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/company.txt");
out = new BufferedWriter(fstream);
out.write(company);
//Close the output stream
out.close();
fstream = new FileWriter("/data/data/contact.backup.alexander.fuchs/backup/"+String.valueOf(i)+"/department.txt");
out = new BufferedWriter(fstream);
out.write(department);
//Close the output stream
out.close();
}
catch(Exception x)
{
}
}
orgCur.close();
}
i++;
}
onDestroy();
}
}
}
You can try divide the operation into smaller pieces and place
Thread.sleep()for a short time. If that’s not enough try changing some code into loop like this:Old code:
New code:
If the example
move()operation takes more time if the given parameter is higher, the old code can cause your program non-responding. The new code will allow android to comunicate with your program duringThread.sleep(), so your app shoud not stop working.@edit
As I can see in your code – you do have several while loops. Try placing Thread.sleep(10) inside them.