I have a simple activity which does stuff in a background thread, and
posts the results back to the UI using a handler. This activity
leaks memory whenever I flip orientation of the display. Specifically
it leaks several (15 or more) 32-byte "4-byte array" instances,
according to the DDMS heap view. In my real activity, if I do all my
work on the actual UI thread (which is of course a horrid thing to do,
given that it can take several seconds), it doesn't leak any memory,
so this seems to be associated with the presence of a handler or of
threads, somehow. Maybe there's some cleanup I should be doing on the
Handler that I don't know about.
I constructed a simplified example based on my activity, which I've
pasted in below. If someone could point out the (probably silly)
mistake I'm making causing it to leak, I would be very grateful.
Thanks in advance,
--Terry.
package com.example.test;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;
public class NotImplementedScreen extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.notimplemented);
_tv = (TextView)findViewById(R.id.notimplemented_text);
startThread();
}
public void startThread() {
_countingThread = new Thread(new Runnable() {
public void run() {
while(!_shouldExit) {
_number += 1;
_handler.post(updateUi);
try { Thread.sleep(250); }
catch(InterruptedException ex) {}
}
_countingThread = null;
}
});
_countingThread.setDaemon(true);
_countingThread.start();
}
public void onDestroy() {
_shouldExit = true;
if(_countingThread != null)
_countingThread.stop();
_countingThread = null;
super.onDestroy();
}
final Handler _handler = new Handler();
final Runnable updateUi = new Runnable() {
public void run() {
_tv.setText(String.format("Value is %d\n", _number));
}
};
TextView _tv;
long _number = 0;
Thread _countingThread;
boolean _shouldExit = false;
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="not
implemented"
android:id="@+id/notimplemented_text" />
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="okay"
android:id="@+id/button_ok" />
</LinearLayout>
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