Android监听Home键、多任务键方法

工作中偶尔会有监听多任务键、监听Home键的变态需求，记录下监听方法哈

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.TextUtils;

/**
 * Created by RestartAndroid
 */

public class DeviceKeyMonitor {

    private final String TAG = "DeviceKeyMonitor";

    /**
     * 参数
     */
    private static final String SYSTEM_REASON = "reason";
    private static final String SYSTEM_HOME_KEY = "homekey";
    private static final String SYSTEM_HOME_RECENT_APPS = "recentapps";

    private Context mContext;
    private BroadcastReceiver mDeviceKeyReceiver = null;
    private OnKeyListener mListener;

    //通过广播监听Home键和多任务键点击
    public DeviceKeyMonitor (Context context, OnKeyListener listener) {
        mContext = context;
        mListener = listener;
        mDeviceKeyReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                if (intent != null && intent.getAction().equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)){
                    String reason = intent.getStringExtra(SYSTEM_REASON);
                    if (!TextUtils.isEmpty(reason)){
                        if (SYSTEM_HOME_KEY.equals(reason)){
                            mListener.onHomeClick();
                        } else if (SYSTEM_HOME_RECENT_APPS.equals(reason)){
                            mListener.onRecentClick();
                        }
                    }
                }
            }
        };
        mContext.registerReceiver(mDeviceKeyReceiver, new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
    }

    public interface OnKeyListener{
        void onHomeClick();
        void onRecentClick();
    }

    public void unregister(){
        if (mDeviceKeyReceiver != null){
            mContext.unregisterReceiver(mDeviceKeyReceiver);
            mDeviceKeyReceiver = null;
        }
    }
}

Activity中的代码：

import android.app.ActivityManager;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;

public class MainActivity extends AppCompatActivity implements DeviceKeyMonitor.OnKeyListener {

    private DeviceKeyMonitor mKeyMonitor;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mKeyMonitor = new DeviceKeyMonitor(this, this);
    }
    

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK){
            Log.d("DeviceKeyMonitor", "按了返回键");
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public void onHomeClick() {
        Log.d("DeviceKeyMonitor", "按了Home键");
    }

    @Override
    public void onRecentClick() {
        Log.d("DeviceKeyMonitor", "按了多任务键");
    }

    @Override
    protected void onDestroy() {
        mKeyMonitor.unregister();
        super.onDestroy();
    }
}