这篇文章主要介绍了Android编程实现长按Button按钮连续响应功能,涉及Android自定义按钮及事件响应操作相关技巧,需要的朋友可以参考下
本文实例讲述了Android编程实现长按Button按钮连续响应功能。分享给大家供大家参考，具体如下：
在电商类app的购物车页面，经常会有这样的需求：长按“+”按钮或者“-”按钮时，购物车中的商品数量连续的增加或减少。
本例的目的就是为了实现这个效果。预览图：
1.自定义Button.
/*** 长按连续响应的Button* Created by admin on 15-6-1.*/public class LongClickButton extends Button {/*** 长按连续响应的监听，长按时将会多次调用该接口中的方法直到长按结束*/private LongClickRepeatListener repeatListener;/*** 间隔时间（ms）*/private long intervalTime;private MyHandler handler;public LongClickButton(Context context) {super(context);init();}public LongClickButton(Context context, AttributeSet attrs) {super(context, attrs);init();}public LongClickButton(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}/*** 初始化监听*/private void init() {handler = new MyHandler(this);setOnLongClickListener(new OnLongClickListener() {@Overridepublic boolean onLongClick(View v) {new Thread(new LongClickThread()).start();return true;}});}/*** 长按时，该线程将会启动*/private class LongClickThread implements Runnable {private int num;@Overridepublic void run() {while (LongClickButton.this.isPressed()) {num++;if (num % 5 == 0) {handler.sendEmptyMessage(1);}SystemClock.sleep(intervalTime / 5);}}}/*** 通过handler，使监听的事件响应在主线程中进行*/private static class MyHandler extends Handler {private WeakReference<LongClickButton> ref;MyHandler(LongClickButton button) {ref = new WeakReference<>(button);}@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);LongClickButton button = ref.get();if (button != null && button.repeatListener != null) {button.repeatListener.repeatAction();}}}/*** 设置长按连续响应的监听和间隔时间，长按时将会多次调用该接口中的方法直到长按结束** @param listener 监听* @param intervalTime 间隔时间（ms）*/public void setLongClickRepeatListener(LongClickRepeatListener listener, long intervalTime) {this.repeatListener = listener;this.intervalTime = intervalTime;}/*** 设置长按连续响应的监听（使用默认间隔时间100ms），长按时将会多次调用该接口中的方法直到长按结束** @param listener 监听*/public void setLongClickRepeatListener(LongClickRepeatListener listener) {setLongClickRepeatListener(listener, 100);}public interface LongClickRepeatListener {void repeatAction();}}
2.在Activity中调用：
LongClickButton buttonSub = (LongClickButton) findViewById(R.id.long_click_button1);LongClickButton buttonAdd = (LongClickButton) findViewById(R.id.long_click_button2);final TextView numberTV = (TextView) findViewById(R.id.main_number);//连续减buttonSub.setLongClickRepeatListener(new LongClickButton.LongClickRepeatListener() {@Overridepublic void repeatAction() {numberTV.setText(String.valueOf(Integer.parseInt(numberTV.getText().toString()) - 1));}}, 50);//连续加buttonAdd.setLongClickRepeatListener(new LongClickButton.LongClickRepeatListener() {@Overridepublic void repeatAction() {numberTV.setText(String.valueOf(Integer.parseInt(numberTV.getText().toString()) + 1));}}, 50);//减1buttonSub.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {numberTV.setText(String.valueOf(Integer.parseInt(numberTV.getText().toString()) - 1));}});//加1buttonAdd.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {numberTV.setText(String.valueOf(Integer.parseInt(numberTV.getText().toString()) + 1));}});
3.很多时候，长按的事件和普通点击的事件是一样的（也就是说，长按相当于连续的快速点击）。这种情况下，自定义Button可以更加简洁：即在长按时，连续的调用普通的OnClickListener。
public class LongClickButton2 extends Button {/*** 间隔时间（ms）*/private long intervalTime = 50;private MyHandler handler;public LongClickButton2(Context context) {super(context);init();}public LongClickButton2(Context context, AttributeSet attrs) {super(context, attrs);init();}public LongClickButton2(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}/*** 初始化监听*/private void init() {handler = new MyHandler(this);setOnLongClickListener(new OnLongClickListener() {@Overridepublic boolean onLongClick(View v) {new Thread(new LongClickThread()).start();return true;}});}/*** 长按时，该线程将会启动*/private class LongClickThread implements Runnable {private int num;@Overridepublic void run() {while (LongClickButton2.this.isPressed()) {num++;if (num % 5 == 0) {handler.sendEmptyMessage(1);}SystemClock.sleep(intervalTime / 5);}}}/*** 通过handler，使监听的事件响应在主线程中进行*/private static class MyHandler extends Handler {private WeakReference<LongClickButton2> ref;MyHandler(LongClickButton2 button) {ref = new WeakReference<>(button);}@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);LongClickButton2 button = ref.get();if (button != null) {//直接调用普通点击事件button.performClick();}}}public void setIntervalTime(long intervalTime) {this.intervalTime = intervalTime;}}
