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android - android中的等待进度条

转载 作者:行者123 更新时间:2023-11-29 14:39:37 25 4
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在我的 android 应用程序中,我将一些数据从服务器数据库复制到本地数据库。代码贴在下面。可能需要 15 分钟以上。对于较慢的连接,它可能会被超过。所以我想显示一个等待进度条,在任务完成之前应该显示“请稍候”。我引用了很多东西,但我不明白如何在下面的代码中使用等待进度条。

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");
}

});

请有人帮助我。提前致谢

最佳答案

使用 Progress Dialog 显示文本“Please Wait...”并在 thread 中实现您的代码,如下所示:

      final ProgressDialog progressDialog = ProgressDialog.show(this, "", "Please wait...");
new Thread() {
public void run() {
try{
//your code here.....
}
catch (Exception e) {
Log.e("tag", e.getMessage());
}
// dismiss the progress dialog
progressDialog.dismiss();
}
}.start();

关于android - android中的等待进度条,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15083226/

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