我想显示进度条,当我点击登录按钮时,消息登录成功我怎么能在android中做任何身体指导我如果可能的话请给出代码
答案 0 :(得分:1)
了解您需要做的是:当用户点击按钮时,启动后台服务(此处验证用户身份)。在进行后台处理时,您必须显示进度条。根据结果显示相应的消息,无论用户是否被授权,例如在Toast或其他活动中说。
要进行冗长的操作,必须使用Thread或AsyncTask。它同时处理UI和后台进程。
你要做的是:在onClick事件中调用AsyncTask。在这里,你必须创建一个LoginOperation对象,然后只需调用它的LoginOperation.execute()方法。
为了显示结果,您可以像以下一样添加消息:
Toast.makeText(context,"Your Message",Toast.LENGTH_LONG).show();
当然,你必须在AsyncTask的onPostExecute()中添加它。
private class LoginOperation extends AsyncTask<String, Void, String> {
private ProgressDialog Dialog = new ProgressDialog(ClassName.this);
@Override
protected String doInBackground(String... params) {
// perform long running operation operation
//Here you have to do your network operations..
return null;
}
/* (non-Javadoc)
* @see android.os.AsyncTask#onPostExecute(java.lang.Object)
*/
@Override
protected void onPostExecute(String result) {
// execution of result of Long time consuming operation
try
{
if(Dialog.isShowing())
{
Dialog.dismiss();
}
// do your Display and data setting operation here
}
catch(Exception e)
{
}
//Here depending upon your validation, display appropriate message.
If(correct_user)
call another activity
else
display error toast message in the same activity
}
/* (non-Javadoc)
* @see android.os.AsyncTask#onPreExecute()
*/
@Override
protected void onPreExecute() {
Dialog.setMessage("Authenticating.....");
Dialog.show();
// Things to be done before execution of long running operation. For example showing ProgessDialog
}
/* (non-Javadoc)
* @see android.os.AsyncTask#onProgressUpdate(Progress[])
*/
@Override
protected void onProgressUpdate(Void... values) {
// Things to be done while execution of long running operation is in progress. For example updating ProgessDialog
}
}