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我想在我的活動中顯示進度條作爲對按鈕單擊的響應。 我讀了另一個問題,我應該使用異步任務,以顯示/不顯示進度條,但當我點擊按鈕進度條沒有正確顯示(它出現的時間應該少得多) 任何建議?無法正常顯示進度條
活動代碼:
public void chooseContactFromList(View view){
ProgressBar pBar = (ProgressBar) findViewById(R.id.progressBar1);
circleActivity progressTask = (circleActivity) new circleActivity(pBar).execute();
AlertDialog.Builder builder = new AlertDialog.Builder(this);
CharSequence[] cs=nameList.toArray(new CharSequence[nameList.size()]);
builder.setTitle("Make your selection");
builder.setItems(cs, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
reciverNumber = phoneList.get(item);
}
});
AlertDialog alert = builder.create();
alert.show();
progressTask.cancel(true);
}
中的AsyncTask代碼:
public class circleActivity extends AsyncTask<Void, Void, Void> {
private ProgressBar progressBar;
public circleActivity(ProgressBar pBar) {
progressBar=pBar;
}
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
progressBar.setVisibility(View.VISIBLE);
}
@Override
protected void onPostExecute(Void result) {
progressBar.setVisibility(View.INVISIBLE);
}
@Override
protected void onProgressUpdate(Void ... progress) {
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
return null;
}
}
感謝
是啊,傻我的 感謝! –