屏幕顶部的自定义Toast

Question

请在回答标准例程之前阅读问题以打印Toast :)

我想在屏幕的左上角显示自定义Toast.我使用此代码创建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,在一些设备中,例如三星Galaxy S4,吐司不是位于(0,0),而是具有40-50像素的边缘.许多其他设备按预期工作.

我很肯定WindowManager添加了边距(Toast视图作为TYPE_TOAST类型的视图添加到WindowManager)

这是为什么？可以修改吗？请看下面的代码,我已经将Toast.java克隆到我自己的类中,并隔离了将视图添加到WM的行:

 // 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);

所以看起来是WindowManager在这些设备上添加这个边距.看起来像一个安全区域或类似的东西,但我无法找到可以改变的地方(或者是否).

帮助赞赏.

Answer 1

我明白了这一点。

从 4.4+ 开始，您必须添加以下标志：

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

这将使您的吐司一直定位到顶部。