網(wǎng)上有很多監(jiān)聽home鍵的方法但是有很多都監(jiān)聽不到，今天總結(jié)一個(gè)相對(duì)來說比較方便和簡單的方法惩阶。

當(dāng)用戶點(diǎn)擊系統(tǒng)層級(jí)的按鍵的時(shí)候都會(huì)發(fā)出系統(tǒng)廣播挎狸，這個(gè)時(shí)候我們只要register相應(yīng)的廣播就可以獲取當(dāng)相應(yīng)事件了，需要注意的是断楷，靜態(tài)注冊(cè)不可以~~只能在代碼里面動(dòng)態(tài)注冊(cè)锨匆！我是在application里面直接注冊(cè)，這樣在整個(gè)app中都能接收到冬筒。

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;


public class HomeKeyListener{
    static final String TAG = "HomeKeyWatcher";
    private Context mContext;
    private IntentFilter mFilter;
    private OnHomePressedListener mListener;
    private HomeKeyRecevier mRecevier;

    // 回調(diào)接口
    public interface OnHomePressedListener {
        public void onHomePressed();

        public void onHomeLongPressed();
    }

    public HomeKeyListener(Context context) {
        mContext = context;
        mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    }

    /**
     * 設(shè)置監(jiān)聽
     *
     * @param listener
     */
    public void setOnHomePressedListener(OnHomePressedListener listener) {
        mListener = listener;
        mRecevier = new HomeKeyRecevier();
    }

    /**
     * 開始監(jiān)聽恐锣，注冊(cè)廣播
     */
    public void startWatch() {
        if (mRecevier != null) {
            mContext.registerReceiver(mRecevier, mFilter);
        }
    }

    /**
     * 停止監(jiān)聽，注銷廣播
     */
    public void stopWatch() {
        if (mRecevier != null) {
            mContext.unregisterReceiver(mRecevier);
        }
    }

    /**
     * 廣播接收者
     */
    class HomeKeyRecevier 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鍵
                            mListener.onHomePressed();
                        } else if (reason
                                .equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
                            // 長按home鍵
                            mListener.onHomeLongPressed();
                        }
                    }
                }
            }
        }
    }
}

在application中注冊(cè)

public class OBDApplication extends Application{

    private HomeKeyWatcher HomeKeyListener;


@Override
    public void onCreate() {
        super.onCreate();

    }





    private void initHomeKeyListener() {
        HomeKeyListener = new HomeKeyListener(this);
        HomeKeyListener.setOnHomePressedListener(new HomeKeyWatcher.OnHomePressedListener() {
            @Override
            public void onHomePressed() {
                WindowUtils.hidePopupWindow();
            }

            @Override
            public void onHomeLongPressed() {

            }
        });
        HomeKeyListener.startWatch();
    }


    @Override
    public void onTerminate() {
        super.onTerminate();
        HomeKeyListener.stopWatch();

    }

}

像網(wǎng)上有很多說監(jiān)聽home鍵在onKeyDown中判斷KeyEvent.ACTION_DOWN （KEYCODE_HOME）直接就可以獲取相應(yīng)的監(jiān)聽舞痰，但是土榴，我試了一下，根本攔截不到响牛，查找了一下原因

/** Key code constant: Home key.
            * This key is handled by the framework and is never delivered to applications. */
            public static final int KEYCODE_HOME            = 3;

原因
這個(gè)事件直接被framework層給截獲了玷禽，never delivered！娃善！永遠(yuǎn)不會(huì)傳遞的application層Ｂ垩堋！聚磺！坯台，所以在onKeyDown處理是拿不到事件的！Ｌ鼻蕖蜒蕾！