我onCreate()以两种不同的方式执行几乎相同的代码（除了 return 语句）：
- 一次在线程中（有效）
- 一次在 AsyncTask 中
不知何故，甚至无法调试 AsyncTask 中引发的异常...您知道为什么此代码在 AsyncTask 中不起作用以及为什么我无法调试 de Exception 吗？（它不作为变量存在）
public class TrainingProgressActivity extends ActivityTemplate {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_training_progress);
// the not working AsyncTask variant
new ProgressGetterTask().execute("");
// the working Thread variant
new Thread(new Runnable() {
public void run() {
try {
RestTemplate restTemplate = RestTemplateFactory.createRestTemplate();
FeatureSetCollectionProgress i = restTemplate.postForObject(URLHelper.BASE_PATH+"training/progress", getDevice(), FeatureSetCollectionProgress.class);
System.out.println(i.getMobilityProgress().get(0).getTransportationMeanType().toString());
} catch(Exception e) {
System.out.println("ex");
e.printStackTrace();
}
}}).start();
}
/**
* ProgressGetterTask. (not working ???)
*/
private class ProgressGetterTask extends AsyncTask<String, FeatureSetCollectionProgress, FeatureSetCollectionProgress> {
protected FeatureSetCollectionProgress doInBackground(String... urls) {
try {
RestTemplate restTemplate = RestTemplateFactory.createRestTemplate();
return restTemplate.postForObject(URLHelper.BASE_PATH+"training/progress", getDevice(), FeatureSetCollectionProgress.class);
} catch(Exception e) {
e.printStackTrace();
return null; // setting breakpoint here, 'e' cannot be resolved to a variable.
}
}
protected void onPostExecute(FeatureSetCollectionProgress featureSetCollectionProgress) {
if(featureSetCollectionProgress!=null) {
} else {
}
}
}
}