Android下监听Home键

测试通过的手机：

1.华为荣耀3（Android 4.2.2）
2.小米2s（Android 4.1.1）
3.联想的手机 （Android2.3.5）
4.Google Nexus 5模拟器（Android 4.4.2）

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

public class HomeWatcher {

    static final String TAG = "wxl";
    private Context mContext;
    private IntentFilter mFilter;
    private OnHomePressedListener mListener;
    private InnerRecevier 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();
                        }
                    }
                }
            }
        }
    }
}

public class MainActivity extends Activity {
    private static final String TAG = "wxl";
    private HomeWatcher mHomeWatcher;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mHomeWatcher = new HomeWatcher(this);
        mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
            @Override
            public void onHomePressed() {
                Toast.makeText(MainActivity.this, "onHomePressed",
                        Toast.LENGTH_LONG).show();
            }

            @Override
            public void onHomeLongPressed() {
                Toast.makeText(MainActivity.this, "onHomeLongPressed",
                        Toast.LENGTH_LONG).show();
            }
        });
        mHomeWatcher.startWatch();
    }

    /**
     * 重新进入或打开屏幕灯
     */
    protected void onRestart() {
        Log.d(TAG, "onRestart");
        mHomeWatcher.startWatch();
        super.onRestart();
    }

    /**
     * 按Home键或关闭屏幕灯
     */
    protected void onPause() {
        super.onPause();
        Log.d(TAG, "onPause");
        mHomeWatcher.stopWatch();// 在onPause中停止监听，不然会报错的。
    }

}