UI线程问题的竞争状况. [英] Race condition with UI thread issue.
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问题描述
这是我正在处理的代码.在这里,我无法更新UI,直到my OnResponse
完成.由于我们正在执行doInBackgrnd
,因此我的textresponse
为空.而且由于onPostExecute
恰好在此之后发生.
This is the code i am working on. Here I cant update the UI until myOnResponse
is finished.Because we are doing a doInBackgrnd
, so my textresponse
is empty. And Since onPostExecute
is happening right after.
对于他来说,我认为PublicProgres应该有所帮助. 如何在AsyncTask上调用PublishProgress?
For his I think PublicProgres should help. How to Call PublishProgress at AsyncTask ?
private class ConversationTask extends AsyncTask<String, Void, String> {
String textResponse = new String();
@Override
protected String doInBackground(String... params) {
System.out.println("in doInBackground");
MessageRequest newMessage = new MessageRequest.Builder().inputText(params[0]).context(context).build();
// async
GLS_service.message("xxxxxxxxx", newMessage).enqueue(new ServiceCallback<MessageResponse>() {
@Override
public void onResponse(MessageResponse response) {
context = response.getContext();
textResponse = response.getText().get(0);
action5(textResponse);
System.out.println(textResponse);
}
@Override
public void onFailure(Exception e) {
}
});
return textResponse;
}@Override protected void onPostExecute(String result) {
reply.setText(textResponse);
}
}
请帮助.
推荐答案
我认为您不必使用AsyncTask
.
您可以执行以下操作:
YourTask.java
YourTask.java
public class YourTask implements Runnable {
private Handler handler;
private TextView textView;
public YourTask(TextView textView){
this.textView = textView;
handler = new Handler();
}
@Override
public void run() {
MessageRequest newMessage = new MessageRequest.Builder().inputText(params[0]).context(context).build();
GLS_service.message("xxxxxxxxx", newMessage).enqueue(new ServiceCallback<MessageResponse>() {
@Override
public void onResponse(MessageResponse response) {
final String textResponse = response.getText().get(0);
handler.post(new Runnable() {
@Override
public void run() {
if(textView != null){
textView.setText(textResponse);
}
}
});
}
@Override
public void onFailure(Exception e) {
}
});
}
}
现在如何使用它:
SomeActivity.java
SomeActivity.java
...
textView = (TextView) findViewById(R.id.textView);
...
Thread thread = new Thread(new YourTask(textView));
thread.start();
...
尽管如此,如果您想在Asynktask
中执行此操作,请尝试
Nevertheless if you want to do this action in Asynktask
just try this
private class ConversationTask extends AsyncTask<String, Void, Void> {
private Handler handler;
public ConversationTask(){
handler = new Handler();
}
@Override
protected Void doInBackground(String... params) {
MessageRequest newMessage = new MessageRequest.Builder().inputText(params[0]).context(context).build();
GLS_service.message("xxxxxxxxx", newMessage).enqueue(new ServiceCallback<MessageResponse>() {
@Override
public void onResponse(MessageResponse response) {
final String textResponse = response.getText().get(0);
handler.post(new Runnable() {
@Override
public void run() {
if(reply != null){
reply.setText(textResponse);
}
}
});
}
@Override
public void onFailure(Exception e) {
}
});
return null;
}
}
希望有帮助
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