DelayAutoCompleteTextView.java

package ua.kpi.ecampus.ui.view;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.View;
import android.widget.AutoCompleteTextView;
import android.widget.ProgressBar;

/**
 * Custom implementation of AutoCompleteTextView. This class adds delay
 * between character entering and sent it to the server.
 * <p/>
 * Created by Administrator on 25.02.2016.
 */
public class DelayAutoCompleteTextView extends AutoCompleteTextView {

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

    /**
     * Time in milliseconds, after which the request will be sent
     * to the server, if the user enters new characters.
     */
    private int mAutoCompleteDelay = DEFAULT_AUTOCOMPLETE_DELAY;
    private ProgressBar mLoadingIndicator;

    /**
     * If, during the delay, the user enters the next character,
     * the request for the previous substring is canceled and
     * carried forward to the time delay. If the user does not change
     * the substring during this time, the request is sent to the server.
     */
    private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            DelayAutoCompleteTextView.super.performFiltering((CharSequence) msg.obj, msg.arg1);
        }
    };

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

    public void setLoadingIndicator(ProgressBar progressBar) {
        mLoadingIndicator = progressBar;
    }

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

    @Override
    protected void performFiltering(CharSequence text, int keyCode) {
        if (mLoadingIndicator != null) {
            mLoadingIndicator.setVisibility(View.VISIBLE);
        }
        mHandler.removeMessages(MESSAGE_TEXT_CHANGED);
        mHandler.sendMessageDelayed(mHandler.obtainMessage(MESSAGE_TEXT_CHANGED, text), mAutoCompleteDelay);
    }

    @Override
    public void onFilterComplete(int count) {
        if (mLoadingIndicator != null) {
            mLoadingIndicator.setVisibility(View.GONE);
        }
        super.onFilterComplete(count);
    }
}