Android捕获home按键 以及实体键捕获

1.有的android平台并不支持home键长按，主要还是看framework里面是否做了处理。

    mHomeWatcher = new HomeWatcher(this);    mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {        @Override        public void onHomePressed() {            Log.e(TAG, "onHomePressed");        }        @Override        public void onHomeLongPressed() {            Log.e(TAG, "onHomeLongPressed");        }    });    mHomeWatcher.startWatch();}

home键捕获类
public class HomeWatcher {

static final String TAG = "HomeWatcher";private Context mContext;private IntentFilter mFilter;private OnHomePressedListener mListener;private BroadcastReceiver mRecevier;// 回调接口public interface OnHomePressedListener {    public void onHomePressed();    public void onHomeLongPressed();}public HomeWatcher(Context context) {    mContext = context;    mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);}/** * 设置监听 *  * @param listener */public void setOnHomePressedListener(OnHomePressedListener listener) {    mListener = listener;    mRecevier = new InnerRecevier();}/** * 开始监听，注册广播 */public void startWatch() {    if (mRecevier != null) {        mContext.registerReceiver(mRecevier, mFilter);    }}/** * 停止监听，注销广播 */public void stopWatch() {    if (mRecevier != null) {        mContext.unregisterReceiver(mRecevier);    }}/** * 广播接收者 */class InnerRecevier extends BroadcastReceiver {    final String SYSTEM_DIALOG_REASON_KEY = "reason";    final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";    final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";    final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {            String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);            if (reason != null) {                Log.e(TAG, "action:" + action + ",reason:" + reason);                if (mListener != null) {                    if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {                        // 短按home键                        mListener.onHomePressed();                    }/* else if (reason                            .equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {                        // 长按home键                        mListener.onHomeLongPressed();                    }*/                }            }        }    }}

}

2.有的android设备有物理按键。物理按键在底层采用的是ADC采样，根据按键按下的电压值来进行判断，然后通过input子系统来上报按键事件。应用层捕获如下：

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_F1) {
if (shorpress) {
Log.i(TAG, ” shortpress keycode f1 key up”);
}
shorpress =false;
return true;

    }    return super.onKeyUp(keyCode, event);}@Overridepublic boolean onKeyLongPress(int keyCode, KeyEvent event) {    Log.i(TAG, "long press keycode   "+keyCode);    // TODO Auto-generated method stub    if (keyCode == KeyEvent.KEYCODE_F1) {        shorpress = false;        Log.i("taoer", "keycode f1 long press");        return true;    }    return false;}@Override public boolean onKeyDown(int keyCode, KeyEvent event){    Log.i(TAG, "short press keycode = "+ keyCode);    if (keyCode == KeyEvent.KEYCODE_F1) {    //  Log.i(CmdList.TAG, "KEYCODE_F1");        if (event.getAction() == KeyEvent.ACTION_DOWN) {            event.startTracking();            if (event.getRepeatCount() == 0) {                shorpress = true;                   }                   }        Log.i("TAG", "keycode f1 short press");        return true;    }    return true;}