Android——进度对话框

java类代码：

 //普通进度对话框
     public void bt8_onClick(View v)
     {
         final ProgressDialog progressDialog = new ProgressDialog(this);
         progressDialog.setMessage("请等待……");
         progressDialog.setTitle("进度对话框");
         progressDialog.setCancelable(false);
         progressDialog.show();
         //不要写业务代码
         //开启子线程
         //实现多线程：1.继承 2.实现接口
         //1.继承Thread，重写run方法，再调用start()方法
         new Thread(){
             @Override
             public void run() {   //{}内表示继承
                 //业务代码
                 try {
                     //延时 线程
                     Thread.sleep(3000);
                 }
                 catch (Exception e)
                 {

                 }
                 //执行完业务代码
                 //关闭
                 progressDialog.dismiss();
             }
         }.start();//{}start负责启动子线程，自动执行run()方法
     }
     //水平进度对话框
     public void bt9_onClick(View v)
     {
         final ProgressDialog progressDialog = new ProgressDialog(this);
         progressDialog.setTitle("水平进度对话框");
         progressDialog.setMessage("正在加载……");
         progressDialog.setCancelable(false);
         //设置成水平
         progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
         progressDialog.show();

         final TextView tv_2 = (TextView)findViewById(R.id.tv_2);

         //启动子线程  实习接口 Runnable，run()
         new Thread(new Runnable() {
             @Override
             public void run() {
                 //模拟进度变化
                 for (int i = 0; i <=100; i++){
                 progressDialog.setProgress(i);
                 try {
                     //延时 线程
                     Thread.sleep(200);
                 }
                 catch (Exception e)
                 {

                 }
                 }
                 //在子线程里访问UI线程的View
                 runOnUiThread(new Runnable() {
                     @Override
                     public void run() {

                         tv_2.setText("下载完成");
                     }
                 });
                 progressDialog.dismiss();
             }
         }).start();
     }

注意开启多线程的方法

附思维导图：