通过 AsyncTask 发送 HTML 请求失败 - Unsuccess to send a HTML request by AsyncTask

我正在尝试使用 AsyncTask 类向后端服务器 php 文件发送 HTML 请求，但是无法完成发送操作，logcat 中出现一些错误消息，我可以寻求一些建议来解决问题吗？

下面是我的AsyncTask类：

private class GrabURL extends AsyncTask<String, Void, Void>{
    ArrayList<NameValuePair> nameValuePairs;
    //private ProgressDialog Dialog;
    public GrabURL() { 
        nameValuePairs = new ArrayList<NameValuePair>(); 
        //Dialog = new ProgressDialog(Reader.this); 
    } 
    protected void onPreExecute(String key, String value) {
        mTest.append("PreExecute");
        //Dialog.setMessage("Sending value..");
        //Dialog.show();
        nameValuePairs.add(new BasicNameValuePair(key,value));
        }
    @Override
    protected Void doInBackground(String... urls) {
        // TODO Auto-generated method stub
        try{
            mTest.append("doinback");
            HttpClient client = new DefaultHttpClient();
            HttpPost post = new HttpPost(urls[0]);
            UrlEncodedFormEntity ent = new UrlEncodedFormEntity(nameValuePairs,HTTP.UTF_8);
            post.setEntity(ent);
            client.execute(post); 
         } catch (Exception e) {
             e.printStackTrace();
         }
        return null;
    }
    protected void onPostExecute(Void unused) {
        mTest.append("PostExecute");
        //Dialog.dismiss();
        Toast.makeText(getApplicationContext(), "Value updated", Toast.LENGTH_SHORT).show();
    }
}

我通过在外部类中调用它来启动发送操作

grab.execute(new String[]{"http://192.168.1.150/myapp/check.php"});

如果我隐藏与对话框相关的内容，则不会显示任何错误消息，但是，它仍然无法与服务器通信。

如果我不隐藏它们，这里是错误消息

07-19 15:11:29.360: E/WindowManager(26555): Activity android.reader.Reader has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@416dddc8 that was originally added here
07-19 15:11:29.360: E/WindowManager(26555): android.view.WindowLeaked: Activity android.reader.Reader has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@416dddc8 that was originally added here
07-19 15:11:29.360: E/WindowManager(26555):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344)
07-19 15:11:29.360: E/WindowManager(26555):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
07-19 15:11:29.360: E/WindowManager(26555):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
07-19 15:11:29.360: E/WindowManager(26555):     at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
07-19 15:11:29.360: E/WindowManager(26555):     at android.view.Window$LocalWindowManager.addView(Window.java:537)
07-19 15:11:29.360: E/WindowManager(26555):     at android.app.Dialog.show(Dialog.java:278)
07-19 15:11:29.360: E/WindowManager(26555):     at android.reader.Reader$GrabURL.onPreExecute(Reader.java:228)
07-19 15:11:29.360: E/WindowManager(26555):     at android.reader.Reader$1.onClick(Reader.java:102)
07-19 15:11:29.360: E/WindowManager(26555):     at android.view.View.performClick(View.java:3511)
07-19 15:11:29.360: E/WindowManager(26555):     at android.view.View$PerformClick.run(View.java:14105)
07-19 15:11:29.360: E/WindowManager(26555):     at android.os.Handler.handleCallback(Handler.java:605)
07-19 15:11:29.360: E/WindowManager(26555):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-19 15:11:29.360: E/WindowManager(26555):     at android.os.Looper.loop(Looper.java:137)
07-19 15:11:29.360: E/WindowManager(26555):     at android.app.ActivityThread.main(ActivityThread.java:4424)
07-19 15:11:29.360: E/WindowManager(26555):     at java.lang.reflect.Method.invokeNative(Native Method)
07-19 15:11:29.360: E/WindowManager(26555):     at java.lang.reflect.Method.invoke(Method.java:511)
07-19 15:11:29.360: E/WindowManager(26555):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-19 15:11:29.360: E/WindowManager(26555):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-19 15:11:29.360: E/WindowManager(26555):     at dalvik.system.NativeStart.main(Native Method)

下面是我的服务器端程序的代码，只是一个简单的php文件。

<?php
    $file = "C:/wamp/www/myapp/file.txt";
    $data = "AID:".$_POST['A']." BID:".$_POST['B'];
    file_put_contents($file, $data);
?>

我已经检查了你的代码。是您的服务器错误。我认为该帖子没有按应有的方式工作。请检查它，然后将其放入AsyncTask。

根据

日志，执行在preExecute()的Dialog.show()停止，你还不知道你的逻辑是否有问题，doInBackground()永远不会执行。

试试这个：

在构造函数中进行初始化

确保Reader是要调用GrabURL的活动的名称。

private class GrabURL extends AsyncTask<String, Void, Void> {
ArrayList<NameValuePair> nameValuePairs;
private ProgressDialog Dialog;
public void GrabURL() {
    nameValuePairs = new ArrayList<NameValuePair>();
    Dialog = new ProgressDialog(Reader.this);
}
protected void onPreExecute(String key, String value) {
    System.out.println("PreExecute");
    Dialog.setMessage("Sending value..");
    Dialog.show();
    nameValuePairs.add(new BasicNameValuePair(key, value));
}
@Override
protected Void doInBackground(String... urls) {
    // TODO Auto-generated method stub
    try {
        System.out.println("doinback");
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(urls[0]);
        UrlEncodedFormEntity ent = new UrlEncodedFormEntity(
                nameValuePairs, HTTP.UTF_8);
        post.setEntity(ent);
        client.execute(post);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}
protected void onPostExecute(Void unused) {
    System.out.println("PostExecute");
    Dialog.dismiss();
    Toast.makeText(getApplicationContext(), "Value updated",
            Toast.LENGTH_SHORT).show();
}
}

问题似乎是您正在尝试通过执行似乎是文本视图的mTest.append("doinback");来从doInBackground()更新UI。因此，请删除它并更好地尝试从onPreExecute()和onPostExecute()更新UI元素。