Android系统中自定义按键的短按双击长按事件

卧疾丰暇豫，翰墨时间作。这篇文章主要讲述Android系统中自定义按键的短按双击长按事件相关的知识，希望能为你提供帮助。
在项目中碰到这样的问题：
由于系统中的按键在底层做了重新定义或者新增了按键，此时需要在APP层对按键事件（keyevent）做分解处理，模拟android系统做法，把keyevent分解成：
1、单击事件：就是普通key的单击；
2、双击事件：500ms内同一按键单击两次；
3、长按事件：同一按键长按超过1000ms（系统中长按事件为500ms）；
4、组合按键：两个以上按键同时按住；

其中的keyevent可以来自Activity、View子类的dispatchKeyEvent方法，也可以是我们自定义的接口，也可以是我们发广播送上来的，根据项目需求；

关于各事件的原理：
1、双击事件：每次点击的up事件中启动一个定时（500ms）线程消息，用Handler.postDelayed()方法。
2、长按事件：每次点击的down事件中启动一个定时（1000ms）线程消息，用Handler.postDelayed()方法，注意：在RepeatCount==0时启动；
3、组合按键：用变量记录每个按键的状态，再进行判断；

具体代码如下： java代码

package com.jerome.util; import android.content.Context; import android.os.Handler; import android.util.Log; import android.view.KeyEvent; public class KeyUtil { private boolean isVolumeDown = false; private boolean isVolumeUp = false; private boolean isMenu = false; private int currentKeyCode = 0; private static Boolean isDoubleClick = false; private static Boolean isLongClick = false; CheckForLongPress mPendingCheckForLongPress = null; CheckForDoublePress mPendingCheckForDoublePress = null; Handler mHandler = new Handler(); Context mContext = null; private String TAG = ""; public KeyUtil(Context context, String tag) { mContext = context; TAG = tag; } public void dispatchKeyEvent(KeyEvent event) { int keycode = event.getKeyCode(); // 有不同按键按下，取消长按、短按的判断 if (currentKeyCode != keycode) { removeLongPressCallback(); isDoubleClick = false; }// 处理长按、单击、双击按键 if (event.getAction() == KeyEvent.ACTION_DOWN) { checkForLongClick(event); } else if (event.getAction() == KeyEvent.ACTION_UP) { checkForDoubleClick(event); }if (keycode == KeyEvent.KEYCODE_VOLUME_DOWN) { if (event.getAction() == KeyEvent.ACTION_DOWN) { isVolumeDown = true; } else if (event.getAction() == KeyEvent.ACTION_UP) { isVolumeDown = false; } } else if (keycode == KeyEvent.KEYCODE_VOLUME_UP) { if (event.getAction() == KeyEvent.ACTION_DOWN) { isVolumeUp = true; } else if (event.getAction() == KeyEvent.ACTION_UP) { isVolumeUp = false; } } else if (keycode == KeyEvent.KEYCODE_MENU) { if (event.getAction() == KeyEvent.ACTION_DOWN) { isMenu = true; } else if (event.getAction() == KeyEvent.ACTION_UP) { isMenu = true; } }// 判断组合按键 if (isVolumeDown & & isVolumeUp & & isMenu & & (keycode == KeyEvent.KEYCODE_VOLUME_UP || keycode == KeyEvent.KEYCODE_VOLUME_DOWN || keycode == KeyEvent.KEYCODE_MENU) & & event.getAction() == KeyEvent.ACTION_DOWN) { //组合按键事件处理； isVolumeDown = false; isVolumeUp = false; isMenu = false; } } private void removeLongPressCallback() { if (mPendingCheckForLongPress != null) { mHandler.removeCallbacks(mPendingCheckForLongPress); } } private void checkForLongClick(KeyEvent event) { int count = event.getRepeatCount(); int keycode = event.getKeyCode(); if (count == 0) { currentKeyCode = keycode; } else { return; } if (mPendingCheckForLongPress == null) { mPendingCheckForLongPress = new CheckForLongPress(); } mPendingCheckForLongPress.setKeycode(event.getKeyCode()); mHandler.postDelayed(mPendingCheckForLongPress, 1000); } class CheckForLongPress implements Runnable {int currentKeycode = 0; public void run() { isLongClick = true; longPress(currentKeycode); }public void setKeycode(int keycode) { currentKeycode = keycode; } } private void longPress(int keycode) { Log.i(TAG, "--longPress 长按事件--" + keycode); } private void singleClick(int keycode) { Log.i(TAG, "--singleClick 单击事件--" + keycode); } private void doublePress(int keycode) { Log.i(TAG, "---doublePress 双击事件--" + keycode); } private void checkForDoubleClick(KeyEvent event) { // 有长按时间发生，则不处理单击、双击事件 removeLongPressCallback(); if (isLongClick) { isLongClick = false; return; }if (!isDoubleClick) { isDoubleClick = true; if (mPendingCheckForDoublePress == null) { mPendingCheckForDoublePress = new CheckForDoublePress(); } mPendingCheckForDoublePress.setKeycode(event.getKeyCode()); mHandler.postDelayed(mPendingCheckForDoublePress, 500); } else { // 500ms内两次单击，触发双击 isDoubleClick = false; doublePress(event.getKeyCode()); } } class CheckForDoublePress implements Runnable {int currentKeycode = 0; public void run() { if (isDoubleClick) { singleClick(currentKeycode); } isDoubleClick = false; }public void setKeycode(int keycode) { currentKeycode = keycode; } } private void removeDoublePressCallback() { if (mPendingCheckForDoublePress != null) { mHandler.removeCallbacks(mPendingCheckForDoublePress); } } }

【Android系统中自定义按键的短按双击长按事件】注意：
只有Action Down状态下RepeatCount才会> 0，避免长按和单击事件混淆；