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显示一个ProgressDialog，然后在线程中取消
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final ProgressDialog dialog = ProgressDialog.show(this, "",
"下载数据，请稍等 …", true, true);
Thread t = new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(10000);//让他显示10秒后，取消ProgressDialog
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
dialog.dismiss();
}
});
t.start();
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