与你日常的标准回答打印敬酒之前，请阅读问题：）

我想在屏幕的左上角显示自定义吐司。我用这个code创建吐司：

I'd like to display a Custom Toast at the top left corner of the screen. I use this code to create the Toast:

    Toast mFixedToast = new Toast(getApplicationContext());
    mFixedToast.setDuration(timeout);
    mFixedToast.setView(myInflatedLayout);
    mFixedToast.setGravity(Gravity.TOP|Gravity.FILL_HORIZONTAL, 0, 0);
    mFixedToast.setMargins(0,0);

然而，在某些设备，例如三星Galaxy S4，面包不定位在（0,0），但像40-50个像素的边距。 许多其他设备正常工作。

However, in some devices, for example Samsung Galaxy S4, the toast is not positioned at (0,0), but with a margin like 40-50 pixels. Many other devices work as expected.

我肯定保证金由窗口管理器添加（烤面包片视图添加类型TYPE_TOAST到窗口管理视图）

I am positive the margin is added by the WindowManager (The toast view is added as a View of type TYPE_TOAST to the WindowManager)

这是为什么？它可以修改？请参阅code以下，我已经克隆Toast.java到我自己的阶级和孤立，其视图被添加到WM行：

 // LayoutParams for the TOAST view ... tried to change params.type but no luck.
 final WindowManager.LayoutParams params = mParams;
 params.height = WindowManager.LayoutParams.WRAP_CONTENT;
 params.width = WindowManager.LayoutParams.WRAP_CONTENT;
 params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
              | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
              | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
            params.format = PixelFormat.TRANSLUCENT;
 params.windowAnimations = android.R.style.Animation_Toast;
 params.type = WindowManager.LayoutParams.TYPE_TOAST;

 mWM = (WindowManager)mView.getContext().getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
 mParams.gravity = gravity;

 // CHECKED these all are 0 !!!
 mParams.x = mX; mParams.y = mY;
 mParams.verticalMargin = mVerticalMargin;
 mParams.horizontalMargin = mHorizontalMargin;
 .
 .
 if (localLOGV) Log.v(TAG, "ADD! " + mView + " in " + this+" with "+mX+","+mY+","+mVerticalMargin+","+mHorizontalMargin);
 mWM.addView(mView, mParams);

因此​​，它看起来就像是谁在添加这些设备在这个保证金的窗口管理器。看起来像一个安全区或类似的东西，但我不能找到在哪里（如果）这是可以改变的。

So it looks like it's the WindowManager who is adding this margin on those devices. Looks like a safe area or something like that, but I cant find where (or if) this can be changed.

帮助AP preciated。

Help appreciated.

推荐答案

我想通了这一点。

开始4.4+必须添加以下标志：

Starting 4.4+ you have to add the following flag:

if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2) {
        mParams.flags = mParams.flags | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
}

这将使你敬酒要一直放置在上面。

This will allow your toast to be positioned all the way to the top.