Question

我目前有一个有4种方法的课程。我需要将其更改为AsyncTask。每个方法都接收不同的参数（File，int，String ...）以使用post或get连接到不同的URL。我的问题是，我是否仍然可以在一个AsyncTask类中以某种方式拥有所有这些操作，或者我需要为每个方法创建新的AsyncTask类？

private class Task extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
     int count = urls.length;
     long totalSize = 0;
     for (int i = 0; i < count; i++) {
     }
     return totalSize;
 }

 protected void onProgressUpdate(Integer... progress) {
     setProgressPercent(progress[0]);
 }

 protected void onPostExecute(Long result) {
     showDialog("Downloaded " + result + " bytes");
 }
 }

Answer 1

这取决于您是否需要同时运行所有4个AsyncTasks，或者它们是否可以按顺序运行。

我认为它们可以按顺序运行，因为它们是当前在主线程中运行的，所以只需传递所有需要的参数并逐个执行它们的操作。实际上，如果已经编写了函数，只需将这些函数移动到AsyncTask类中：

MainActivity.java：

public static final int FILE_TYPE = 0;
public static final int INT_TYPE = 1;
public static final int STRING_TYPE = 2;

taskargs = new Object[] { "mystring", new File("somefile.txt"), new myObject("somearg") };

new Task(STRING_TYPE, taskargs).execute();

的AsyncTask

private class Task extends AsyncTask<URL, Integer, Long> {
    private Int type;
    private Object[] objects;
    public Task(Int type, Object[] objects) {
        this.type = type;
        this.objects = objects;
    }
    protected Long doInBackground(URL... urls) {
        int count = urls.length;
        long totalSize = 0;
        for (int i = 0; i < count; i++) {
        }
        //obviously you can switch on whatever string/int you'd like
        switch (type) {
            case 0:  taskFile();
                     break;
            case 1:  taskInteger();
                     break;
            case 2:  taskString();
                     break;
            default: break;
        }
        return totalSize;
    }

    protected void onProgressUpdate(Integer... progress) {
        setProgressPercent(progress[0]);
    }

    protected void onPostExecute(Long result) {
        showDialog("Downloaded " + result + " bytes");
    }
    protected void taskFile(){ //do something with objects array }
    protected void taskInteger(){ //do something with objects array }
    protected void taskString(){ //do something with objects array }
}

AsyncTask，多种不同的操作

1 个答案: