问题描述
我知道ProgressDialog与线程的问题已经被问了很多次，但没有一个解决方案，似乎工作为我的项目。基本上我想做的事情是这样的：1），当用户点击一个按钮的活动发送身份验证请求到服务器2），而这是被做了ProgressDialog显示3）当效应初探来了，我想解散ProgressDialog和返回的对象被读取并通过活动PTED间$ P $
如果我：1）设置线程与效应初探更新的应用领域，下一个方法（这是线程之外）访问现场时，抛出NPE2）如果我包括在主题下一种方法，第二种方法抛出一个'了java.lang.RuntimeException：内螺纹无法创建处理程序，并没有叫尺蠖prepare（）
对不起了很长的文字，但我完全在这个失去它...我的code是某事是这样的：
公共类XXX延伸活动实现OnClickListener {
//（...）
私人SoapObject返回object;
私人字符串响应;
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
//（...）
authProgressDialog = ProgressDialog.show（XXX.this，，鉴定......，真，假）;
新主题（新的Runnable（）{
@覆盖
公共无效的run（）{
认证（）; //方法是通过SOAP调用API
authenticateReal（）; //方法处理响应
}
}）。开始（）;
mHandler =新的处理程序（）{
公共无效的handleMessage（信息MSG）{
super.handleMessage（MSG）;
开关（msg.what）{
案例10：
authProgressDialog.dismiss（）;
打破;
}
}
};
}
}
公共无效验证（）{
// API的东西（...）
AndroidHttpTransport AHT =新AndroidHttpTransport（URL）;
尝试 {
aht.call（SOAP_ACTION，的SoapEnvelope）;
返回object =（SoapObject）soapEnvelope.getResponse（）;
。响应= returnObject.getProperty（ResponseStatus）的toString（）;
}
赶上（例外五）{
e.printStackTrace（）;
}
最后 {
mHandler.sendEmptyMessage（10）;
}
}
//方法需要访问返回object和效应初探对象和
//在这其中的NPE的或其他异常抛出
公共无效authenticateReal（）{
//（...）
}
您更好地使用 的AsyncTask （这是Android的方式）：
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）;
新TheTask（）执行（）。
}
私有类TheTask扩展的AsyncTask＆LT;虚空，虚空，虚空＆GT; {
@覆盖
在preExecute保护无效（）{
authProgressDialog = ProgressDialog.show（XXX.this，，鉴定......，真，假）;
}
@覆盖
保护无效doInBackground（虚空...... PARAMS）{
认证（）; //方法是通过SOAP调用API
authenticateReal（）; //方法处理响应
返回null;
}
@覆盖
保护无效onPostExecute（无效的结果）{
authProgressDialog.dismiss（）;
}
}
顺便说一句......我发现这presentation是非常有用的（它谈论REST的应用程序，但可以采用同样的理念，为不同类型的应用程序）的
I know that ProgressDialog with Threads questions have been asked many times but none of the solutions seem to work for my project. Basically what I want to do is this:1) when a user clicks a button the Activity sends an auth request to the server2) while this is being done a ProgressDialog is shown3) when the reponse comes I want to dismiss the ProgressDialog and the return object to be read and interpreted by the Activity
If I:1) set the Thread to update the Application field with the reponse, the next method (which is outside of the Thread) throws an NPE when accessing the field2) if I include the next method in the Thread, the second method throws a 'java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()'
Sorry for a long text, but I am totally losing it over this... My code is sth like this:
public class XXX extends Activity implements OnClickListener {
// (...)
private SoapObject returnObject;
private String response;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// (...)
authProgressDialog = ProgressDialog.show(XXX.this, "", "Authenticating...", true, false);
new Thread(new Runnable() {
@Override
public void run() {
authenticate(); // method that calls the API via SOAP
authenticateReal(); // method that handles the response
}
}).start();
mHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 10:
authProgressDialog.dismiss();
break;
}
}
};
}
}
public void authenticate() {
// API stuff (...)
AndroidHttpTransport aht = new AndroidHttpTransport(URL);
try {
aht.call(SOAP_ACTION, soapEnvelope);
returnObject = (SoapObject) soapEnvelope.getResponse();
response = returnObject.getProperty("ResponseStatus").toString();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
mHandler.sendEmptyMessage(10);
}
}
// Method that needs to access returnObject and reponse objects and
// it is here where the NPE's or other exceptions are thrown
public void authenticateReal() {
// (...)
}
You better use AsyncTask (which is the Android way):
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new TheTask().execute();
}
private class TheTask extends AsyncTask<Void, Void, Void>{
@Override
protected void onPreExecute() {
authProgressDialog = ProgressDialog.show(XXX.this, "", "Authenticating...", true, false);
}
@Override
protected Void doInBackground(Void... params) {
authenticate(); // method that calls the API via SOAP
authenticateReal(); // method that handles the response
return null;
}
@Override
protected void onPostExecute(Void result) {
authProgressDialog.dismiss();
}
}
By the way... I have found this presentation to be very useful (it talks about REST apps, but you can apply the same concept for different kind of apps): Developing Android REST client applications
这篇关于如何实现ProgressDialog而活动请求SoapObject从Web服务？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！