android - Google Inbox 如何显示覆盖键盘的 snackbar ？

Question

Google Inbox 如何在键盘上方(覆盖、分层)显示快捷栏？这不是默认行为，我已经用基本的协调器布局、键盘打开和 snackbar 进行了测试:默认行为是在键盘后面显示 snackbar 。这个问题有很多答案:“我如何在键盘上方显示 snackbar ”，但我还没有找到如何重现 Google 自己的收件箱应用程序的 snackbar 行为。

你能告诉我如何实现吗？

Answer 1

Inbox 不使用标准的 Snackbar 也不使用覆盖窗口，它使用自定义 View 。我反编译了 APK 以验证它们是如何实现这种效果的，并尝试重现一个最小的示例。

首先创建一个新布局custom_snackbar.xml:

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#323232"
    android:paddingLeft="10dp"
    android:paddingRight="10dp">

    <TextView
        android:id="@+id/text"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center_vertical"
        android:text="Marked done"
        android:textColor="@android:color/white"/>

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:background="@android:color/transparent"
        android:gravity="center_vertical"
        android:minWidth="48dp"
        android:text="undo"
        android:textAllCaps="true"
        android:textColor="#a1c2fa"/>

</LinearLayout>

然后创建这些方法来显示和关闭自定义 Snackbar:

private View customSnackbar;

private void showCustomSnackbar(final Context context) {
    customSnackbar = LayoutInflater.from(context).inflate(R.layout.custom_snackbar, null, false);
    customSnackbar.findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //action implementation
        }
    });

    WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
    lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
    lp.width = WindowManager.LayoutParams.MATCH_PARENT;
    lp.format = PixelFormat.TRANSLUCENT;
    lp.gravity = Gravity.BOTTOM;
    lp.flags = WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH |
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
    customSnackbar.setLayoutParams(lp);

    WindowManager windowManager = (WindowManager) context.getSystemService(WINDOW_SERVICE);

    if (windowManager != null) {
        windowManager.addView(customSnackbar, customSnackbar.getLayoutParams());

        Point m = new Point();
        windowManager.getDefaultDisplay().getSize(m);
        int childMeasureSpecWidth = ViewGroup.getChildMeasureSpec(View.MeasureSpec.makeMeasureSpec(m.x, View.MeasureSpec.EXACTLY), 0, lp.width);
        int childMeasureSpecHeight = ViewGroup.getChildMeasureSpec(View.MeasureSpec.makeMeasureSpec(m.y, View.MeasureSpec.EXACTLY), 0, lp.height);
        customSnackbar.measure(childMeasureSpecWidth, childMeasureSpecHeight);

        customSnackbar.setTranslationY(customSnackbar.getMeasuredHeight());
        customSnackbar.animate()
                .setDuration(300)
                .translationX(0.0f)
                .translationY(0.0f);
    }
}

private void dismissCustomSnackbar(final Context context) {
    customSnackbar.animate()
            .setDuration(300)
            .translationX(0.0f)
            .translationY(customSnackbar.getMeasuredHeight())
            .withEndAction(new Runnable() {
                @Override
                public void run() {
                    WindowManager windowManager = (WindowManager) context.getSystemService(WINDOW_SERVICE);
                    if (windowManager != null) {
                        windowManager.removeView(customSnackbar);
                    }
                }
            });
}

这是获得的结果: