Android系统中自定义按键的短按、双击、长按事件
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Android系统中自定义按键的短按、双击、长按事件
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在項目中碰到這樣的問題：
由于系統中的按鍵在底層做了重新定義或者新增了按鍵，此時需要在APP層對按鍵事件（keyevent）做分解處理，模擬Android系統做法，把keyevent分解成：
1、單擊事件：就是普通key的單擊；
2、雙擊事件：500ms內同一按鍵單擊兩次；
3、長按事件：同一按鍵長按超過1000ms（系統中長按事件為500ms）；
4、組合按鍵：兩個以上按鍵同時按住；
其中的keyevent可以來自Activity、View子類的dispatchKeyEvent方法，也可以是我們自定義的接口，也可以是我們發廣播送上來的，根據項目需求；
關于各事件的原理：
1、雙擊事件：每次點擊的up事件中啟動一個定時（500ms）線程消息，用Handler.postDelayed()方法。
2、長按事件：每次點擊的down事件中啟動一個定時（1000ms）線程消息，用Handler.postDelayed()方法，注意：在RepeatCount==0時啟動；
3、組合按鍵：用變量記錄每個按鍵的狀態，再進行判斷；
具體代碼如下：
Java代碼 ?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();?? ?? ????????//?有不同按鍵按下，取消長按、短按的判斷?? ????????if?(currentKeyCode?!=?keycode)?{?? ????????????removeLongPressCallback();?? ????????????isDoubleClick?=?false;?? ????????}?? ?? ????????//?處理長按、單擊、雙擊按鍵?? ????????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;?? ????????????}?? ????????}?? ?? ????????//?判斷組合按鍵?? ????????if?(isVolumeDown?? ????????????????&&?isVolumeUp?? ????????????????&&?isMenu?? ????????????????&&?(keycode?==?KeyEvent.KEYCODE_VOLUME_UP?? ????????????????????????||?keycode?==?KeyEvent.KEYCODE_VOLUME_DOWN?||?keycode?==?KeyEvent.KEYCODE_MENU)?? ????????????????&&?event.getAction()?==?KeyEvent.ACTION_DOWN)?{?? ????????????//組合按鍵事件處理；?? ????????????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?長按事件--"?+?keycode);?? ????}?? ?? ????private?void?singleClick(int?keycode)?{?? ????????Log.i(TAG,?"--singleClick?單擊事件--"?+?keycode);?? ????}?? ?? ????private?void?doublePress(int?keycode)?{?? ????????Log.i(TAG,?"---doublePress?雙擊事件--"?+?keycode);?? ????}?? ?? ????private?void?checkForDoubleClick(KeyEvent?event)?{?? ????????//?有長按時間發生，則不處理單擊、雙擊事件?? ????????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內兩次單擊，觸發雙擊?? ????????????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);?? ????????}?? ????}?? }??
注意：
只有Action Down狀態下RepeatCount才會>0，避免長按和單擊事件混淆；
由于系統中的按鍵在底層做了重新定義或者新增了按鍵，此時需要在APP層對按鍵事件（keyevent）做分解處理，模擬Android系統做法，把keyevent分解成：
1、單擊事件：就是普通key的單擊；
2、雙擊事件：500ms內同一按鍵單擊兩次；
3、長按事件：同一按鍵長按超過1000ms（系統中長按事件為500ms）；
4、組合按鍵：兩個以上按鍵同時按住；
其中的keyevent可以來自Activity、View子類的dispatchKeyEvent方法，也可以是我們自定義的接口，也可以是我們發廣播送上來的，根據項目需求；
關于各事件的原理：
1、雙擊事件：每次點擊的up事件中啟動一個定時（500ms）線程消息，用Handler.postDelayed()方法。
2、長按事件：每次點擊的down事件中啟動一個定時（1000ms）線程消息，用Handler.postDelayed()方法，注意：在RepeatCount==0時啟動；
3、組合按鍵：用變量記錄每個按鍵的狀態，再進行判斷；
具體代碼如下：
Java代碼 ?
注意：
只有Action Down狀態下RepeatCount才會>0，避免長按和單擊事件混淆；
轉載于:https://www.cnblogs.com/Free-Thinker/p/6113297.html
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