浮窗WindowManager view返回和Home按键事件监听

出于功能需求，需要在所有的view之上显示浮窗，于是需要在WindowManager的View上处理返回键的响应，

mFloatingWindowView =  layoutInflater.inflate(R.layout.floating_window, null, false);

mFloatingWindowLayoutParams = new WindowManager.LayoutParams();

  // 设置window type
        mUserConversationWindowParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;

        mUserConversationWindowParams.format = PixelFormat.TRANSLUCENT;// 设置图片格式，效果为背景透明

        // 设置Window flag
        mUserConversationWindowParams.flags =
                //可使用FLAG_DISMISS_KEYGUARD选项直接解除非加锁的锁屏状态。此选项只用于最顶层的全屏幕窗口。
                WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD

                        | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL   //必须  设置窗口不拦截窗口范围之外事件

                         |WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH  // 必须  设置在有FLAG_NOT_TOUCH_MODAL属性时，窗口之外事件发生时自己也获取事件

                        | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;

mWindowManager.addView(mFloatingWindowView, mFloatingWindowLayoutParams);

这里千万要注意不能用WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE，我就是死在这上面的，如果设置成FLAG_NOT_FOCUSABLE，死都收不到返回键的事件的!

import android.content.Context;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.widget.LinearLayout;

/**
 * Created by KB-Shirlman on 4/26/2016.
 */
public class FloatingWindowView extends LinearLayout {
    public FloatingWindowView(Context context) {
        super(context);
    }

    public FloatingWindowView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FloatingWindowView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK
                || event.getKeyCode() == KeyEvent.KEYCODE_SETTINGS) {

if(event.getAction()==KeyEvent.ACTION_DOWN){   //按键  按下和移开会有两个不同的事件所以需要区分
          closecao();   //点击返回 要执行的方法
}

} return super.dispatchKeyEvent(event); }  }

floating_window.xml

<?xml version="1.0" encoding="utf-8"?>
<YOUR.PACKAGE.NAME.FloatingWindowView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="1">

</YOUR.PACKAGE.NAME.FloatingWindowView>

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<?xml version="1.0" encoding="utf-8"?> <YOUR.PACKAGE.NAME.FloatingWindowView     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical"     android:weightSum="1">      </YOUR.PACKAGE.NAME.FloatingWindowView>

下面附赠哪都能搜索的到的WidnowManager Home按键监听。

private IntentFilter mHomeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);

private BroadcastReceiver mHomeListenerReceiver = new BroadcastReceiver() {
final String SYSTEM_DIALOG_REASON_KEY = "reason";
final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";

@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);

if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)
&& reason != null && reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
closeFloatingWindow();
}
}
};

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private IntentFilter mHomeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);   private BroadcastReceiver mHomeListenerReceiver = new BroadcastReceiver() { final String SYSTEM_DIALOG_REASON_KEY = "reason"; final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";   @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);   if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS) && reason != null && reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) { closeFloatingWindow(); } } };

打开浮窗时调用：

this.registerReceiver(mHomeListenerReceiver, mHomeFilter);

1	this.registerReceiver(mHomeListenerReceiver, mHomeFilter);

关闭浮窗时调用：

this.unregisterReceiver(mHomeListenerReceiver);

1	this.unregisterReceiver(mHomeListenerReceiver);