android - 如何在所有 Activity 中使用一个加载窗口实例

Question

首先，谢谢你。

我想为所有 Activity 创建一个加载窗口。加载窗口的布局是match_parent/match_parent ConstraintLayout，有一个lottieAnimationView(或ProgressBar)。

换句话说，我想要透明的全屏加载窗口。每个 Activitiy，添加 ProgressBar..attach.. 我认为这不是一个好的解决方案。

因此，我尝试将 AlertDialog 用作单例，但是当我运行 AsyncTask 时，当 Activity 的上下文发生变化时我无法关闭对话框。

如何在我的所有 Activity 中使用自定义加载窗口单例？

class AlertUtils {
    companion object {
        private var loadingDialog:AlertDialog?=null

        @JvmStatic
        fun showLoadingDialog(activity : Activity, theme: LoadingColorTheme=LoadingColorTheme.COLOR_WHITE_DEFAULT) {
            if (activity.isFinishing)
                return

            loadingDialog = AlertDialog.Builder(activity, android.R.style.Theme_Translucent_NoTitleBar).create()
            loadingDialog?.let {
                it.setCancelable(false)
                it.show()

                it.setContentView(R.layout.progress_dialog_loading_lottie)
                setThemeLoadingDialog(activity, it, theme)
            }
        }

        @JvmStatic
        fun hideLoadingDialog() {
            loadingDialog?.let {_loadingDialog ->
                if (_loadingDialog.isShowing) {
                    _loadingDialog.dismiss()
                }
            }
        }

        private fun setThemeLoadingDialog(activity: Activity, loadingDialog: AlertDialog, theme: LoadingColorTheme) {
            val parentLayout = loadingDialog.findViewById<ConstraintLayout>(R.id.progress_dialog_loading_lottie_layout)
            val lottieView = loadingDialog.findViewById<LottieAnimationView>(R.id.progress_dialog_lottie_view)

            if (theme === LoadingColorTheme.COLOR_BLACK) {
                parentLayout?.setBackgroundColor(ContextCompat.getColor(activity, R.color.colorBlackAlpha70))
                lottieView?.setAnimation(R.raw.loading_indicator_white)
            } else {
                parentLayout?.setBackgroundColor(ContextCompat.getColor(activity, R.color.colorWhiteAlpha80))
                lottieView?.setAnimation(R.raw.loading_indicator_color)
            }
        }
    }
}

Answer 1

我创建了一个具有以下方法的类

public static void showDialog4Activity(final Context context, String title, String message) {

            LayoutInflater inflater = LayoutInflater.from(context);
            @SuppressLint("InflateParams") final View dialogView = inflater.inflate(R.layout.aommoncls_dialogbox, null);
            TextView titileTextView = (TextView) dialogView.findViewById(R.id.tv_titile);
            TextView msgTextView = (TextView) dialogView.findViewById(R.id.tv_msg);
            Button dialogButtonOKButton = (Button) dialogView.findViewById(R.id.dialogButtonOK);
            titileTextView.setTypeface(Validations.setTypeface(context));
            msgTextView.setTypeface(Validations.setTypeface(context));
            dialogButtonOKButton.setTypeface(Validations.setTypeface(context));
            msgTextView.setText(message + "");
            titileTextView.setText(title + "");
    //        final AlertDialog.Builder builder = new AlertDialog.Builder(context);
    //
    //        final AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(context, R.style.myDialog));
            final Dialog builder = new Dialog(context, R.style.myDialog);
    //        final AlertDialog b = builder.create();
            builder.create();
            //  builder.setTitle("Material Style Dialog");
            builder.setCancelable(true);
    //        builder.setView(dialogView);
            builder.setContentView(dialogView);
            builder.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
            builder.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
            builder.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
            builder.show();
    //        final AlertDialog show = builder.show();
            dialogButtonOKButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                  //  show.dismiss();
                    builder.dismiss();
                }
            });
        }

并且像下面这样调用

  CLASSNAME.showDialog4Activity(LoginActivity.this, "",""); 

这里的 CLASSNAME 是我们在其中定义了 showDialog4Activity 方法的类。