如何停止和启动ProgressBar

Question

我无法阻止ProgressBar.它的风格是ProgressBarStylesmall.如何启动和停止循环,小ProgressBar？

Answer 1

默认情况下,您可以使progressBar可见并在不需要时隐藏它,如下所示:

progressBar.setVisibility(View.GONE);

如果你想以编程方式控制它,那么你可以通过以下方式实现:

progressBar.setVisibility(View.VISIBLE); //to show
progressBar.setVisibility(View.GONE); // to hide

你甚至可以使用ProgressDialog:

private ProgressDialog progressDialog;
...

public void showProgressDialog() {
    if (progressDialog == null) {
        progressDialog = new ProgressDialog(PhotographerDetailActivity.this);
        progressDialog.setIndeterminate(true);
        progressDialog.setCancelable(false);
    }
    progressDialog.setMessage("your message");
    progressDialog.show();
}

public void dismissProgressDialog() {
    if (progressDialog != null ) {
        progressDialog.dismiss();
    }

希望它会对你有所帮助.

Answer 2

您需要为此处理AsyncTasks.

/*
 * We set the visibility to true. If it was already visible 
 * there's no need of doing this but we do it for the sake of readability.
 */
final ProgressBar progressBar = (ProgressBar)findViewById(R.id.progressBar1);
progressBar.setVisibility(View.VISIBLE);
new AsyncTask<Void,Void,Void>(){

//The variables you need to set go here

    @Override
    protected Void doInBackground(final Void... params){
         // Do your loading here. Don't touch any views from here, and then return null
         return null;
    }


    @Override
    protected void onPostExecute(final Void result){
         // Update your views here
         progressBar.setVisibility(View.GONE);
    }
}.execute()

Answer 3

我不知道这是否有帮助，但你可以使用ProgressDialog. 假设您有一个ProgressDialog名为progressDialog您可以使用的运行progressDialog.dismiss();。ProgressDialog只需确保您要忽略的实例是ProgressDialog实际显示的实例即可。您可以使用 检查它progressDialog.isShowing();。开始一个ProgressDialog：

progressDialog = ProgressDialog
                    .show(myActivityContext,
                            "ProgressDialog Title",
                                "ProgressDialog Body");

默认情况下，ProgressDialogUI 是圆形的，就像您需要的那样。