Android编程实现长按Button按钮连续响应功能示例

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.

public class LonGClickButton extends Button {
  
  private LongClickRepeatListener repeatListener;
  
  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();
  }
  
  private void init() {
    handler = new MyHandler(this);
    setOnLongClickListener(new OnLongClickListener() {
      @Override
      public boolean onLongClick(View v) {
        new Thread(new LongClickThread()).start();
        return true;
      }
    });
  }
  
  private class LongClickThread implements Runnable {
    private int num;
    @Override
    public void run() {
      while (LongClickButton.this.isPressed()) {
        num++;
        if (num % 5 == 0) {
          handler.sendEmptyMessage(1);
        }
        SystemClock.sleep(intervalTime / 5);
      }
    }
  }
  
  private static class MyHandler extends Handler {
    private WeakReference<LongClickButton> ref;
    MyHandler(LongClickButton button) {
      ref = new WeakReference<>(button);
    }
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      LongClickButton button = ref.get();
      if (button != null && button.repeatListener != null) {
        button.repeatListener.repeatAction();
      }
    }
  }
  
  public void setLongClickRepeatListener(LongClickRepeatListener listener, long intervalTime) {
    this.repeatListener = listener;
    this.intervalTime = intervalTime;
  }
  
  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() {
  @Override
  public void repeatAction() {
    numberTV.setText(String.valueOf(Integer.parseInt(numberTV.getText().toString()) - 1));
  }
}, 50);
//连续加
buttonAdd.setLongClickRepeatListener(new LongClickButton.LongClickRepeatListener() {
  @Override
  public void repeatAction() {
    numberTV.setText(String.valueOf(Integer.parseInt(numberTV.getText().toString()) + 1));
  }
}, 50);
//减1
buttonSub.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
    numberTV.setText(String.valueOf(Integer.parseInt(numberTV.getText().toString()) - 1));
  }
});
//加1
buttonAdd.setOnClickListener(new View.OnClickListener() {
  @Override
  public 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 {
  
  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();
  }
  
  private void init() {
    handler = new MyHandler(this);
    setOnLongClickListener(new OnLongClickListener() {
      @Override
      public boolean onLongClick(View v) {
        new Thread(new LongClickThread()).start();
        return true;
      }
    });
  }
  
  private class LongClickThread implements Runnable {
    private int num;
    @Override
    public void run() {
      while (LongClickButton2.this.isPressed()) {
        num++;
        if (num % 5 == 0) {
          handler.sendEmptyMessage(1);
        }
        SystemClock.sleep(intervalTime / 5);
      }
    }
  }
  
  private static class MyHandler extends Handler {
    private WeakReference<LongClickButton2> ref;
    MyHandler(LongClickButton2 button) {
      ref = new WeakReference<>(button);
    }
    @Override
    public 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;
  }
}

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希望本文所述对大家Android程序设计有所帮助。

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