Android中ShowcaseView显示在BottomSheetDialog后方的问题解决

问题原因 #

Dialog本身是独立的Window，默认层级高于Activity的Window。你当前的ShowcaseView基于Activity的Context创建，会依附在Activity的Window上，因此会被Dialog的Window遮挡。

解决方案 #

让ShowcaseView依附于Dialog的Window而非Activity的Window，同时调整其Window层级确保覆盖Dialog，修改后的代码如下：

report.setOnClickListener(v -> {
    final Dialog dialog = new Dialog(MainActivity.this);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setContentView(R.layout.bottom_dialog_layout);

    EditText report_bill_type = dialog.findViewById(R.id.bll);
    dialog.show();
    dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
                                 ViewGroup.LayoutParams.WRAP_CONTENT);
    dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    dialog.getWindow().setGravity(Gravity.BOTTOM);

    // 获取Dialog窗口的Context来创建ShowcaseView
    Context dialogWindowContext = dialog.getWindow().getContext();
    GuideView guideView = new GuideView.Builder(dialogWindowContext)
            .setTitle("Title here")
            .setContentText("Description here")
            .setGravity(smartdevelop.ir.eram.showcaseviewlib.config.Gravity.auto)
            .setTargetView(report_bill_type)
            .setDismissType(DismissType.anywhere)
            .build();

    // 调整ShowcaseView的窗口层级，确保覆盖Dialog
    if (guideView.getWindow() != null) {
        WindowManager.LayoutParams params = guideView.getWindow().getAttributes();
        // 根据系统版本设置对应的窗口类型
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        } else {
            params.type = WindowManager.LayoutParams.TYPE_APPLICATION_SUB_PANEL;
        }
        params.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        guideView.getWindow().setAttributes(params);
    }

    guideView.show();
});

补充说明 #

• 使用Dialog的WindowContext创建ShowcaseView，可让其与Dialog处于同一层级体系
• Android 8.0及以上需用TYPE_APPLICATION_OVERLAY类型，低版本用TYPE_APPLICATION_SUB_PANEL，前者需在Manifest中声明<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>权限（应用内弹窗场景通常无需动态申请）

内容的提问来源于stack exchange，提问作者user21248724