Android——进度对话框

java类代码：
 1 //普通进度对话框
 2     public void bt8_onClick(View v)
 3     {
 4         final ProgressDialog progressDialog = new ProgressDialog(this);
 5         progressDialog.setMessage("请等待……");
 6         progressDialog.setTitle("进度对话框");
 7         progressDialog.setCancelable(false);
 8         progressDialog.show();
 9         //不要写业务代码
10         //开启子线程
11         //实现多线程：1.继承 2.实现接口
12         //1.继承Thread，重写run方法，再调用start()方法
13         new Thread(){
14             @Override
15             public void run() {   //{}内表示继承
16                 //业务代码
17                 try {
18                     //延时 线程
19                     Thread.sleep(3000);
20                 }
21                 catch (Exception e)
22                 {
23 
24                 }
25                 //执行完业务代码
26                 //关闭
27                 progressDialog.dismiss();
28             }
29         }.start();//{}start负责启动子线程，自动执行run()方法
30     }
31     //水平进度对话框
32     public void bt9_onClick(View v)
33     {
34         final ProgressDialog progressDialog = new ProgressDialog(this);
35         progressDialog.setTitle("水平进度对话框");
36         progressDialog.setMessage("正在加载……");
37         progressDialog.setCancelable(false);
38         //设置成水平
39         progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
40         progressDialog.show();
41 
42         final TextView tv_2 = (TextView)findViewById(R.id.tv_2);
43 
44         //启动子线程  实习接口 Runnable，run()
45         new Thread(new Runnable() {
46             @Override
47             public void run() {
48                 //模拟进度变化
49                 for (int i = 0; i <=100; i++){
50                 progressDialog.setProgress(i);
51                 try {
52                     //延时 线程
53                     Thread.sleep(200);
54                 }
55                 catch (Exception e)
56                 {
57 
58                 }
59                 }
60                 //在子线程里访问UI线程的View
61                 runOnUiThread(new Runnable() {
62                     @Override
63                     public void run() {
64 
65                         tv_2.setText("下载完成");
66                     }
67                 });
68                 progressDialog.dismiss();
69             }
70         }).start();
71     }
注意开启多线程的方法
附思维导图：