加载等待展示【Loading】

package com.zhcs.gis.app.modulecore.core.component.tool;

import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;

import com.zhcs.gis.app.modulecore.R;

import java.lang.ref.WeakReference;

import androidx.appcompat.app.AlertDialog;

public class LoadingDialogUtils_M {
    private static AlertDialog loadingDialog;
    private static WeakReference<Activity> reference;

    private static void init(Activity act) {
        init(act, -1);
    }

    private static void init(Activity activity, int res) {
        if (loadingDialog == null || reference == null || reference.get() == null || reference.get().isFinishing()) {
            reference = new WeakReference<>(activity);
            loadingDialog = new AlertDialog.Builder(reference.get()).create();
            if (res > 0) {
                View view = LayoutInflater.from(activity).inflate(res, null);
                loadingDialog.setView(view);
                loadingDialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
//                loadingDialog.setContentView(res);
            } else {
                loadingDialog.setMessage("加载中...");
            }
            loadingDialog.setCancelable(false);
        }
    }

    public static void setCancelable(boolean b) {
        if (loadingDialog == null) return;
        loadingDialog.setCancelable(b);
    }

    /**
     * 显示等待框
     */
    public static void show(Activity act) {
        show(act, false);
    }

    public static void show(Activity act, boolean isCancelable) {
        show(act, R.layout.dialog_loading, isCancelable);
    }

    public static void show(Activity activity, int res, boolean isCancelable) {
        init(activity, res);
        loadingDialog.show();
        setCancelable(isCancelable);
    }

    /**
     * 隐藏等待框
     */
    public static void dismiss() {
        if (loadingDialog != null && loadingDialog.isShowing()) {
            loadingDialog.dismiss();
            loadingDialog = null;
            reference = null;
        }
    }
}

在使用的时候，在baseactivity里面这样设置：

public void showLoading(boolean show) {
        if (show) {
            LoadingDialogUtils_M.show(context, true);
        } else {
            LoadingDialogUtils_M.dismiss();
        }
    }

 附件：

这是dialog_loading布局文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ProgressBar
        android:id="@+id/progress"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerInParent="true"
        android:indeterminateDrawable="@drawable/bg_progressbar" />
</RelativeLayout>

这是bg_progressbar配置：

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@mipmap/img_loading"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="1080" />

最后就是加载的图片img_loading的样式，可以自定义，随便上网找一个就可以，看着好看就行

---

最后就可以使用了，挺有用的一个小技巧，加载用的，也可以用其他的方式实现，只要效果一样就行。