I have breakpoints set, but they seem to be ignore (or never seen).
My code is below. I'm trying to backup a sql db to an SD card.
When I RUN it (not Debug mode) in eclipse, I get the message from the onPreExecute and followed shortly by the message from the onPostExecute.
I have BreakPoints set in almost every line of the ExportDatabaseFileTask.
When I RUN it (in Debug mode) in eclipse, I stop at the breakpoints in onPreExecute, and then as I step further, THE VERY NEXT LINE the Debugger goes to is:
mDbHelper.open();
I then step through the rest of the normal code and am left wth the AVD showing the message from the onPreExecute, wher it will apparently STAY FOREVER.
I do NOT see any of the lines BREAKPOINTED in:
doInBackground onPostExecute copyFile
So, I have to respectfully disagree with the comment that I don't have it breakpointed or it is not being executed. So, I'll reask my question: How do you debug (STEP THROUGH) doInBackground code of an AsyncTask?
case BACKUP_ID:
if (ScoreAGame.this.isExternalStorageAvail()) {
mDbHelper.close();
new ExportDatabaseFileTask().execute();
mDbHelper.open();
} else {
Toast.makeText(ScoreAGame.this, "External storage is not available, unable to export data.",
Toast.LENGTH_SHORT).show();
}
return true;
case RESTORE_ID:
selectCourse();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
private boolean isExternalStorageAvail() {
return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
}
private class ExportDatabaseFileTask extends AsyncTask<String, Void, Boolean> {
private final ProgressDialog dialog = new ProgressDialog(ScoreAGame.this);
// can use UI thread here
protected void onPreExecute() {
this.dialog.setMessage("Exporting database...");
this.dialog.show();
}
// automatically done on worker thread (separate from UI thread)
protected Boolean doInBackground(final String... args) {
File dbFile =
new File(Environment.getDataDirectory() + "/data/com.discgolf/databases/discgolfdb.db");
File exportDir = new File(Environment.getExternalStorageDirectory(), "discgolfbackup");
if (!exportDir.exists()) {
exportDir.mkdirs();
}
File file = new File(exportDir, dbFile.getName());
try {
file.createNewFile();
this.copyFile(dbFile, file);
return true;
}
catch (IOException e) {
Log.e(TAG, e.getMessage(), e);
return false;
}
}
// can use UI thread here
protected void onPostExecute(final Boolean success) {
if (this.dialog.isShowing()) {
this.dialog.dismiss();
}
if (success) {
Toast.makeText(ScoreAGame.this, "Export successful!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(ScoreAGame.this, "Export failed", Toast.LENGTH_SHORT).show();
}
}
void copyFile(File src, File dst) throws IOException {
FileChannel inChannel = new FileInputStream(src).getChannel();
FileChannel outChannel = new FileOutputStream(dst).getChannel();
try {
inChannel.transferTo(0, inChannel.size(), outChannel);
}
finally {
if (inChannel != null) {
inChannel.close();
}
if (outChannel != null) {
outChannel.close();
}
}
}
}
doInBackground(Params) – This method is invoked on the background thread immediately after onPreExecute() finishes its execution. Main purpose of this method is to perform the background operations that can take a long time. The parameters of the Asynchronous task are passed to this step for execution.
AsyncTask instances can only be used one time.
An asynchronous task is defined by 3 generic types, called Params , Progress and Result , and 4 steps, called onPreExecute , doInBackground , onProgressUpdate and onPostExecute .
Usage. AsyncTask must be subclassed to be used. The subclass will override at least one method ( doInBackground(Params...) ), and most often will override a second one ( onPostExecute(Result) .)
check this How do I use the Eclipse debugger in an AsyncTask when developing for Android?
Put the following code fragment in the beginning of doInBackground()
if(android.os.Debug.isDebuggerConnected())
android.os.Debug.waitForDebugger();
Then when you set a breakpoint in that thread, eclipse will find it.
Courtesy: sargas
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