为了用户体验用好，App在网络请求时通常都会显示个进度显示圈圈，提示用户耐心等待，最脍炙人口的莫过于登录啦。

接下来我们就通过Dialog来实现，然后在BaseActivity，BaseFragment中提供方法供调用

先看看自定义的dialog

 1 package com.example.kbr.utils;
 2 
 3 import android.animation.ObjectAnimator;
 4 import android.animation.ValueAnimator;
 5 import android.app.Dialog;
 6 import android.content.Context;
 7 import android.os.Bundle;
 8 import android.support.annotation.NonNull;
 9 import android.support.annotation.Nullable;
10 import android.support.v7.widget.AppCompatImageView;
11 import android.view.animation.Animation;
12 import android.widget.ImageView;
13 
14 /**
15  * Created by keranbin on 2017/12/19.
16  */
17 
18 public class LoadingDialog extends Dialog {
19     private ObjectAnimator objectAnimator = null;
20     private AppCompatImageView circle;
21     private long duration = 2000;
22 
23     public LoadingDialog(@NonNull Context context) {
24         super(context);
25     }
26 
27     public LoadingDialog(@NonNull Context context, int themeResId) {
28         super(context, themeResId);
29     }
30 
31     protected LoadingDialog(@NonNull Context context, boolean cancelable, @Nullable OnCancelListener cancelListener) {
32         super(context, cancelable, cancelListener);
33     }
34 
35     @Override
36     protected void onCreate(Bundle savedInstanceState) {
37         super.onCreate(savedInstanceState);
38         setContentView(R.layout.dialog_loading);
39     }
40 
41 
42     @Override
43     public void show() {
44         super.show();
45         startAnim();
46         setOnDismissListener(dialog -> {
47             endAnim();
48         });
49     }
50 
51     /**
52      * 启动动画
53      */
54     private void startAnim() {
55         setCanceledOnTouchOutside(false);
56         circle = findViewById(R.id.loading);
57         objectAnimator = ObjectAnimator.ofFloat(circle, "rotation", 0.0f, 360.0f);
58         //设置动画时间
59         objectAnimator.setDuration(duration);
60         //设置动画重复次数，这里-1代表无限
61         objectAnimator.setRepeatCount(Animation.INFINITE);
62         //设置动画循环模式。
63         objectAnimator.setRepeatMode(ValueAnimator.RESTART);
64         objectAnimator.start();
65     }
66 
67 
68     /**
69      * 结束动画
70      */
71     private void endAnim() {
72         objectAnimator.end();
73         objectAnimator = null;
74         circle = null;
75     }
76 
77 }

布局也非常简单

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     android:layout_width="match_parent"
 5     android:layout_height="wrap_content"
 6     android:alpha="0.4"
 7     android:background="#000000"
 8     android:gravity="center"
 9     android:orientation="vertical"
10     android:paddingBottom="20dp"
11     android:paddingLeft="16dp"
12     android:paddingRight="16dp"
13     android:paddingTop="20dp">
14 
15     <android.support.v7.widget.AppCompatImageView
16         android:id="@+id/loading"
17         android:layout_width="48dp"
18         android:layout_height="48dp"
19         app:srcCompat="@drawable/loading" />
20 </RelativeLayout>

BaseActivity,BaseFragment中提供方法

 1     private LoadingDialog dialog;
 2 
 3 
 4     public void showLoading(){
 5         if (dialog == null) {
 6             dialog = new LoadingDialog(this);
 7         }
 8         dialog.show();
 9     }
10 
11 
12     public void clearLoading(){
13         if (dialog != null) {
14             dialog.dismiss();
15         }
16     }

在需要用到的地方调用即可

 1  showLoading();
 2 
 3         //执行网络耗时任务（这里时模拟）
 4         new Thread(new Runnable() {
 5             @Override
 6             public void run() {
 7                 try {
 8                     Thread.sleep(10000);
 9                     clearLoading();
10                 } catch (InterruptedException e) {
11                     e.printStackTrace();
12                 }
13             }
14         }).start();