您可以按照以下代码实现它。
package org.me.rapidchange;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnKeyListener;import android.view.View.OnTouchListener;import android.widget.Button;import android.widget.TextView;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class MainActivity extends Activity implements OnKeyListener, OnTouchListener, onClickListener { private class UpdateCounterTask implements Runnable { private boolean mInc; public UpdateCounterTask(boolean inc) { mInc = inc; } public void run() { if (mInc) { mHandler.sendEmptyMessage(MSG_INC); } else { mHandler.sendEmptyMessage(MSG_DEC); } } } private static final int MSG_INC = 0; private static final int MSG_DEC = 1; private Button mIncButton; private Button mDecButton; private TextView mText; private int mCounter; private Handler mHandler; private ScheduledExecutorService mUpdater; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_INC: inc(); return; case MSG_DEC: dec(); return; } super.handleMessage(msg); } }; mIncButton = (Button) findViewById(R.id.inc_button); mDecButton = (Button) findViewById(R.id.dec_button); mText = (TextView) findViewById(R.id.text); mIncButton.setonTouchListener(this); mIncButton.setonKeyListener(this); mIncButton.setonClickListener(this); mDecButton.setonTouchListener(this); mDecButton.setonKeyListener(this); mDecButton.setonClickListener(this); } private void inc() { mCounter++; mText.setText(Integer.toString(mCounter)); } private void dec() { mCounter--; mText.setText(Integer.toString(mCounter)); } private void startUpdating(boolean inc) { if (mUpdater != null) { Log.e(getClass().getSimpleName(), "Another executor is still active"); return; } mUpdater = Executors.newSingleThreadScheduledExecutor(); mUpdater.scheduleAtFixedRate(new UpdateCounterTask(inc), 200, 200, TimeUnit.MILLISECONDS); } private void stopUpdating() { mUpdater.shutdownNow(); mUpdater = null; } public void onClick(View v) { if (mUpdater == null) { if (v == mIncButton) { inc(); } else { dec(); } } } public boolean onKey(View v, int keyCode, KeyEvent event) { boolean isKeyOfInterest = keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER; boolean isReleased = event.getAction() == KeyEvent.ACTION_UP; boolean isPressed = event.getAction() == KeyEvent.ACTION_DOWN && event.getAction() != KeyEvent.ACTION_MULTIPLE; if (isKeyOfInterest && isReleased) { stopUpdating(); } else if (isKeyOfInterest && isPressed) { startUpdating(v == mIncButton); } return false; } public boolean onTouch(View v, MotionEvent event) { boolean isReleased = event.getAction() == MotionEvent.ACTION_UP || event.getAction() == MotionEvent.ACTION_CANCEL; boolean isPressed = event.getAction() == MotionEvent.ACTION_DOWN; if (isReleased) { stopUpdating(); } else if (isPressed) { startUpdating(v == mIncButton); } return false; }}
