Java 异步任务'；s doInBackground（）不会对某些任务执行（尽管有新的实例化）

这个错误很常见，但尽管应用了最流行的解决方案好几天，我还是被卡住了。我有几个类扩展了AsyncTask

奇怪的是，my

PostComment。java

确实调用doInBackground，但

下载注释。java

不，尽管它们一个接一个地在同一个函数中。我调用他们execute的顺序并不重要

java调用DownloadComments和PostComments

@Override
public void onClick(View v) {
    switch(v.getId()) {
        case(R.id.Post):

        // Start DownloadComments
        // Execute doInBackground NOT CALLED
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            new DownloadComments().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, "Clinton");
        } else {
            new DownloadComments().execute(candidate);
        }

        // Post Comment
        EditText commentHandler = (EditText) findViewById(R.id.comment);
        String commentString = commentHandler.getText().toString();
        // Execute doInBackground IS CALLED
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            new PostComment().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, commentString, MainActivity.username, Integer.toString(MainActivity.PosterID));
        } else {
            new PostComment().execute(commentString, MainActivity.username, Integer.toString(MainActivity.PosterID));
        }
        break;
    default:
        break;
    }
}

PostComment.java（

扩展异步任务

）

DownloadComments

扩展异步任务

根本不输入此方法

@Override
protected String doInBackground(String... passedIn) {
    try {
        String candidate = passedIn[0];
        String link = "http://particlecollider.net76.net/downloadComments.php?candidate="+candidate;
        int CommentsInLinearList;

    URL url = new URL(link);
    URLConnection conn = url.openConnection();

    System.setProperty("http.keepAlive", "false");
    // Kill keep-alive property
    conn.setRequestProperty("connection", "close");

    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));

    StringBuilder sb = new StringBuilder();
    String line = null;

    // Read Server Response
    // Skip until it works
    while (!(line = reader.readLine()).contains("COMMENTLINEARLIST")) {
        // Finished
    }
    CommentsInLinearList = Integer.parseInt(reader.readLine());
    while (CommentsInLinearList > 0) {
        line = reader.readLine();
        sb.append(line);
        CommentsInLinearList--;
    }

    JSONObject jObject = new JSONObject(sb.toString());
    JSONArray myJSONArray = jObject.getJSONArray("CommentLinearList");
    if(myJSONArray != null) {
        for(int i=0; i<myJSONArray.length(); i++) {
            JSONObject targetComment = myJSONArray.getJSONObject(i);
            Comment PushComment = new Comment(candidate);
            PushComment._ID = Integer.parseInt(targetComment.getString("ID"));
            PushComment._Candidate = candidate;
            PushComment._PosterID = Integer.parseInt(targetComment.getString("PosterID"));
            PushComment._ReplyToId = Integer.parseInt(targetComment.getString("ReplyToID"));
            PushComment._Rating = Integer.parseInt(targetComment.getString("Rating"));
            PushComment._Comment = targetComment.getString("Comment");
            // PushComment into candidateCommentArrayList
            candidateCommentArrayList.add(PushComment);
        }
        // getMenuInflater().inflate(R.menu., candidateCommentArrayList);
    }
    return sb.toString();
} catch (Exception e) {
    e.printStackTrace();
}

return null;
}

@覆盖
受保护的字符串doInBackground（字符串…passedIn）{
试一试{
字符串候选者=passedIn[0]；
字符串链接=”http://particlecollider.net76.net/downloadComments.php?candidate=“+候选人；
int注释线性列表；
URL=新的URL（链接）；
URLConnection conn=url.openConnection（）；
set属性（“http.keepAlive”、“false”）；
//杀生财产
conn.setRequestProperty（“连接”、“关闭”）；
BufferedReader=新的BufferedReader（新的InputStreamReader（conn.getInputStream（））；
StringBuilder sb=新的StringBuilder（）；
字符串行=null；
//读取服务器响应
//跳过直到它工作
而（！（line=reader.readLine（））.contains（“COMMENTLINEARLIST”））{
//完成
}
CommentsInLinearList=Integer.parseInt（reader.readLine（））；
而（CommentsInLinearList>0）{
line=reader.readLine（）；
某人附加（行）；
评论线性主义者--；
}
JSONObject jObject=新的JSONObject（sb.toString（））；
JSONArray myJSONArray=jObject.getJSONArray（“CommentLinearList”）；
if（myJSONArray！=null）{
对于（int i=0；iIt没有输入PostComments的doInBackground，但它是否输入PostComments？是的，对于PostComments和DownloadComments，构造函数都会被调用。感谢您的响应。您是否将断点放在switch语句上？我没有，我很好奇它为什么会出现。我假设调试器没有通过因为mStatus总是挂起或运行，所以我一直在测试我能做的一切。现在我在评论PostComment的
doInBackground
，我用DownloadComment的
doInBackground
替换它，并在我调用DownloadComments的任何地方调用PostComment。奇怪的是，它进入了doInBackground wh恩，我这么做了，所以问题不在于方法的内容。我想知道为什么它区分DownloadComments.java而不是PostComment.java？
@Override
protected String doInBackground(String... passedIn) {
    try {
        String candidate = passedIn[0];
        String link = "http://particlecollider.net76.net/downloadComments.php?candidate="+candidate;
        int CommentsInLinearList;

    URL url = new URL(link);
    URLConnection conn = url.openConnection();

    System.setProperty("http.keepAlive", "false");
    // Kill keep-alive property
    conn.setRequestProperty("connection", "close");

    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));

    StringBuilder sb = new StringBuilder();
    String line = null;

    // Read Server Response
    // Skip until it works
    while (!(line = reader.readLine()).contains("COMMENTLINEARLIST")) {
        // Finished
    }
    CommentsInLinearList = Integer.parseInt(reader.readLine());
    while (CommentsInLinearList > 0) {
        line = reader.readLine();
        sb.append(line);
        CommentsInLinearList--;
    }

    JSONObject jObject = new JSONObject(sb.toString());
    JSONArray myJSONArray = jObject.getJSONArray("CommentLinearList");
    if(myJSONArray != null) {
        for(int i=0; i<myJSONArray.length(); i++) {
            JSONObject targetComment = myJSONArray.getJSONObject(i);
            Comment PushComment = new Comment(candidate);
            PushComment._ID = Integer.parseInt(targetComment.getString("ID"));
            PushComment._Candidate = candidate;
            PushComment._PosterID = Integer.parseInt(targetComment.getString("PosterID"));
            PushComment._ReplyToId = Integer.parseInt(targetComment.getString("ReplyToID"));
            PushComment._Rating = Integer.parseInt(targetComment.getString("Rating"));
            PushComment._Comment = targetComment.getString("Comment");
            // PushComment into candidateCommentArrayList
            candidateCommentArrayList.add(PushComment);
        }
        // getMenuInflater().inflate(R.menu., candidateCommentArrayList);
    }
    return sb.toString();
} catch (Exception e) {
    e.printStackTrace();
}

return null;
}