很抱歉，如果之前有人问过这个问题，但我找不到这个问题的答案(我已经搜索过了!)
我已尝试按照 google/android 文档在我的应用执行冗长任务时显示并旋转不确定的进度条。
protected void readData(final String whatToFind)
{
try
{
if (whatToFind.length() == 0)
{
adapter.notifyDataSetChanged();
return;
}
mProgress.setVisibility(View.VISIBLE);
mProgressText.setVisibility(View.VISIBLE);
m_dialog = new ProgressDialog(this);
m_dialog.setTitle("Searching...");
m_dialog.setMessage("Please wait while searching...");
m_dialog.setIndeterminate(true);
m_dialog.setCancelable(true);
m_dialog.show();
new Thread(new Runnable()
{
public void run()
{
mHandler.post(new Runnable()
{
public void run()
{
while (LotsOfWorkGoingOn)
{
// Update the progress bar
mHandler.post(new Runnable() {
public void run() {
mProgress.setProgress(m_i); /// vain attempt to make the progressbar spin
}
});
mProgress.setVisibility(View.GONE);
mProgressText.setVisibility(View.GONE);
m_dialog.hide();
}
});
}
}).start();
}
catch (Exception ex)
{
Log.e(LOGid, "Error listing items:" + ex.getStackTrace());
}
最佳答案
setProgress 仅在进度条不是 Indeterminate 时有效。
Indeterminate 表示，它没有进度量，当您不知道完成/剩余进度量以结束任务时使用。
如 documentation 中所述:
A progress bar can also be made indeterminate. In indeterminate mode, the progress bar shows a cyclic animation without an indication of progress. This mode is used by applications when the length of the task is unknown. The indeterminate progress bar can be either a spinning wheel or a horizontal bar.
另一方面，如果您连进度条都看不到，也许您的背景很浅？
尝试将样式属性设置为:
style="@android:style/Widget.ProgressBar.Inverse"
关于Android Indeterminate ProgressBar 不旋转，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10376705/