在我的android應用程序中,我將一些數據從服務器數據庫複製到本地數據庫。該代碼發佈如下。這可能需要15分鐘以上。對於較慢的連接,可能會超出。所以我想顯示一個等待進度條,應該顯示「請稍等」,直到任務完成。我提到很多東西,但是我無法理解如何在下面的代碼中使用等待進度條。在android中等待進度條
refresh.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
mySQLiteAdapter.openToWrite();
mySQLiteAdapter.deleteAll();
radapter.openToWrite();
radapter.deleteAll();
uadapter.openToWrite();
uadapter.deleteAll();
try
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://xxxxxxxxxxxxxxxxxxxxx");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG).show();
}
try {
jObj = new JSONObject(json);
contacts = jObj.getJSONArray("get");
for(int i = 0; i < contacts.length(); i++){
JSONObject c = contacts.getJSONObject(i);
if(!c.isNull("rname"))// || c.getString("rcode").equals(null))
{
rname = c.getString("rname");
rcode = c.getString("rcode");
radapter.insert(rcode, rname);
}
else
{
rname = "";
rcode = c.getString("rcode");
radapter.insert(rcode, rname);
}
}
Toast.makeText(getBaseContext(), " Ryot BackUp completed", Toast.LENGTH_SHORT).show();
} catch (JSONException e) {
Toast.makeText(getBaseContext(), "Error"+e.toString(), Toast.LENGTH_LONG).show();
}
adapter.deleteAll();
oadapter.deleteAll();
e2.setText("Back Up completed");
}
});
有人幫助我。在此先感謝
瞭解水平進度條和線程以相應處理它。 – 2013-02-26 07:02:57