ProgressBar
ProgressBar 既进度条，当我们在做一些耗时操作的时候（例如下载文件），可以使用ProgressBar给用户提供一个进度提示，告诉用户当前的进度。ProgressBar提供了两种进度显示模式，分别是具有进度值的精确模式和不具有进度值的模糊模式。
在默认情况下，进度条一般是水平的，但是你可以通过将fillDirection选项设置为向北或向南，来将它设置为垂直的。
Private Sub Command1_Click() Dim Counter As Integer Dim Workarea(250) As String ProgressBar1.Min = LBound(Workarea) ProgressBar1.Max = UBound(Workarea) ProgressBar1.Visible = True //设置进度的值为 Min。 ProgressBar1.Value = ProgressBar1.Min //在整个数组中循环。 For Counter = LBound(Workarea) To UBound(Workarea) //设置数组中每项的初始值。 Workarea(Counter) = "Initial value" & Counter ProgressBar1.Value = Counter Next Counter ProgressBar1.Visible = False ProgressBar1.Value = ProgressBar1.Min End Sub Private Sub Form_Load() ProgressBar1.Align = vbAlignBottom ProgressBar1.Visible = False Command1.Caption = "Initialize array" End Sub 实例： Java代码片段： private ProgressBar pb_progressbar_bar; private TextView tv_progressbar_num; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.progressbar); pb_progressbar_bar = (ProgressBar) findViewById(R.id.pb_progressbar_bar); tv_progressbar_num = (TextView) findViewById(R.id.tv_progressbar_num); } /** * ANR * application not responsing 应用程序未响应 * why:在主线程中执行了耗时的操作 * how:在子线程中执行耗时操作 * @param view */ public void download(View view){ new MyThread().start(); } Handler handler=new Handler(){ //接受消息，更新UI界面 @Override public void handleMessage(Message msg) { super.handleMessage(msg); int i=msg.what; tv_progressbar_num.setText(i+""); } }; class MyThread extends Thread{ @Override public void run() { super.run(); for (int i = 0; i <=100 ; i++) { pb_progressbar_bar.setProgress(i); // tv_progressbar_num.setText(i+""); //在子线程中发消息 handler.sendEmptyMessage(i); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } } } 结果：
