[sg] Android(安卓)6.0 添加对Home键的拦截

先说结论：所有修改只适用定制系统有系统源码的场景，否则上层App只能监听到HOME按键的广播（而且由于Home键的特殊性，完全可靠的监听同样需要在framework层修改源码），无办法拦截,下面的方法亲自验证过，参考https://blog.csdn.net/u013286571/article/details/50012901了，修改了其中顺序有误的地方

1. 源码修改 com.android.server.wm.WindowManagerService

            if (attrs != null) {                //add by sg , 注释掉对参数类型的判断/*                if (win.mAttrs.type != attrs.type) {                    throw new IllegalArgumentException(                            "Window type can not be changed after the window is added.");                }*/                flagChanges = win.mAttrs.flags ^= attrs.flags;                attrChanges = win.mAttrs.copyFrom(attrs);                if ((attrChanges & (WindowManager.LayoutParams.LAYOUT_CHANGED                        | WindowManager.LayoutParams.SYSTEM_UI_VISIBILITY_CHANGED)) != 0) {                    win.mLayoutNeeded = true;                }            }

2. 源码修改 com.android.server.policy.PhoneWindowManager

public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags)方法
方法内部添加一个局部变量标志位isGohome,默认为true

   final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;   final boolean canceled = event.isCanceled();+ boolean isGohome = true;

找到Home键事件，增加从WindowManager获取参数，这个参数我们会在activity的onAttach方法进行设置，当接受到该参数时，则将标志位isGohome设为false

        if (keyCode == KeyEvent.KEYCODE_HOME) {+            WindowManager.LayoutParams attrs1 = win != null ? win.getAttrs() : null;+           if (attrs1 != null) {+                int type1 = attrs1.type;+               if (type1 == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG) {+                    isGohome = false;+                }+            }

调用返回桌面方法前根据标志位进行判断，默认没有设置参数的activity就直接返回桌面，配置了WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG的activity就不响应

                if(isGohome == true){                    handleShortPressOnHome();                }

3. 在app需要拦截的activity

@Override
public void onAttachedToWindow() {
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
super.onAttachedToWindow();
}

1. 源码修改 com.android.server.wm.WindowManagerService

2. 源码修改 com.android.server.policy.PhoneWindowManager

3. 在app需要拦截的activity

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