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：