DelayAutoCompleteTextView

public class DelayAutoCompleteTextView extends AutoCompleteTextView {

    private static final int MESSAGE_TEXT_CHANGED = 100;
    private static final int DEFAULT_AUTOCOMPLETE_DELAY = 1000;

    private int mAutoCompleteDelay = DEFAULT_AUTOCOMPLETE_DELAY;

    private static class AvoidingMemoryLeakHandler extends Handler {
        private final WeakReference<DelayAutoCompleteTextView> delayAutoCompleteTextViewWeakReference;

        public AvoidingMemoryLeakHandler(DelayAutoCompleteTextView activity) {
            delayAutoCompleteTextViewWeakReference = new WeakReference<DelayAutoCompleteTextView>(activity);
        }

        @Override
        public void handleMessage(Message msg) {
            DelayAutoCompleteTextView delayAutoCompleteTextView = delayAutoCompleteTextViewWeakReference.get();
            if (delayAutoCompleteTextView != null && msg != null) {
                delayAutoCompleteTextView.filter((CharSequence) msg.obj, msg.arg1);
            }
        }
    }

    private final AvoidingMemoryLeakHandler mHandler = new AvoidingMemoryLeakHandler(this);

    public DelayAutoCompleteTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setAutoCompleteDelay(int autoCompleteDelay) {
        mAutoCompleteDelay = autoCompleteDelay;
    }

    long lastTime = 0;
    @Override
    protected void performFiltering(CharSequence text, int keyCode) {
        mHandler.removeMessages(MESSAGE_TEXT_CHANGED);
        long curTime = System.currentTimeMillis();
        if(curTime - lastTime > mAutoCompleteDelay) {
            mHandler.sendMessage(mHandler.obtainMessage(MESSAGE_TEXT_CHANGED, text));
        } else {
            mHandler.sendMessageDelayed(mHandler.obtainMessage(MESSAGE_TEXT_CHANGED, text), mAutoCompleteDelay -  (curTime - lastTime));
        }
        lastTime = System.currentTimeMillis();
    }

    protected void filter(CharSequence text, int keyCode) {
        DelayAutoCompleteTextView.super.performFiltering(text, keyCode);
    }

    @Override
    public void onFilterComplete(int count) {
        super.onFilterComplete(count);
    }

    @Override
    public boolean enoughToFilter() {
        return true;
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
        if(focused && !((AddPostActivity)getContext()).isFinishing()) {
            performFiltering(getText(), 0);
            showDropDown();
        }
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (mHandler != null) {
            mHandler.removeCallbacksAndMessages(this);
        }
    }
}