[英]progressDialog in onNewIntent
掃描NFC標簽時,我正在使用onNewIntent。 我想在掃描標簽時顯示ProgressDialog。 我嘗試使用線程,但崩潰了我的應用程序。 當onNewIntent啟動時,有什么方法可以顯示progressDialog嗎?
public void onNewIntent(Intent intent) {
setIntent(intent);
Thread scanning = new Thread(new Runnable() {
public void run() {
ScanDialog = ProgressDialog.show(BorrowActivity.this,
"Scanning...", "scanning");
}
});
scanning.start();
.
. //next code doing something
.
}
您不能在另一個線程上更新或使用UI:
解:
調用主線程並在那里更新用戶界面
Thread scanning = new Thread(new Runnable() {
public void run() {
runOnUiThread(new Runnable()
{
public void run()
{
ScanDialog = ProgressDialog.show(BorrowActivity.this,
"Scanning...", "scanning");
}
});
}
});
最后,我用asyncTask修復了它。
public void onNewIntent(Intent intent) {
setIntent(intent);
ScanDialog = ProgressDialog.show(BorrowActivity.this,
"Scanning...", "Scanning");
try {
new DoBackgroundTask().execute();
} catch (Exception e) {
//error catch here
}
ScanDialog.dismiss();
和AsyncTask:
private class DoBackgroundTask extends AsyncTask<Integer, String, Integer> {
protected Integer doInBackground(Integer... status) {
//do something
}
protected void onProgressUpdate(String... message) {
}
protected void onPostExecute(Integer status) {
}
}
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