Android(安卓)禁止下拉通知栏

使用WindowManager添加View覆盖掉通知栏来实现禁止下拉通知栏功能：
import android.content.Context;import android.graphics.PixelFormat;import android.view.Gravity;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.LinearLayout;public class DisableNotiView {    private WindowManager.LayoutParams mLayoutParam;    private Context mContext;    private WindowManager wm;    private LinearLayout relative;    public DisableNotiView(Context context) {        mContext = context;    }    public void createView(){        wm = ((WindowManager)mContext.getApplicationContext()                .getSystemService("window"));        int mScreenWidth = wm.getDefaultDisplay().getWidth();        mLayoutParam = new WindowManager.LayoutParams();        mLayoutParam.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;        mLayoutParam.format = PixelFormat.RGBA_8888;        mLayoutParam.windowAnimations = 16973828;        mLayoutParam.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |                  WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR |                  WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;          mLayoutParam.gravity = Gravity.TOP;        mLayoutParam.width = mScreenWidth;        mLayoutParam.height = getStatusBarHeight(mContext);        LayoutInflater inflater = LayoutInflater.from(mContext.getApplicationContext());        relative = (LinearLayout)inflater.inflate(R.layout.state_bat_linearlayout, null, false);        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT                , getStatusBarHeight(mContext));        relative.setLayoutParams(params);        relative.setOnTouchListener(new OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                return false;            }        });        wm.addView(relative, mLayoutParam);    }    public static int getStatusBarHeight(Context context) {          int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");          return context.getResources().getDimensionPixelSize(resourceId);      }      public void removeView(){        wm.removeView(relative);    }}
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