Question

我正在使用http post将文件上传到我的服务器我有一个简单的方法来完成工作，但是加载...对话框永远不会显示如何解决这个问题...这是我的代码

public void send_data() throws IOException
{
    HttpURLConnection connection = null;
    DataOutputStream outputStream = null;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary =  "*****";

    ProgressDialog dialog = ProgressDialog.show(CaptureTestActivity.this, "", 
        "Loading. Please wait...", true);
    dialog.show();

    String urlServer = "http://poi.gps.ro:80/postimg?lat=" + String.valueOf(mDraw.lat) + "&lon=" + String.valueOf(mDraw.lon)+"&comment=" + tmp;
    Log.w("DHA", urlServer);
    URL url = new URL(urlServer);
    if (url != null)
    {   
        Log.w("DHA", "Merge aici");
        connection = (HttpURLConnection) url.openConnection();
        if (connection != null)
        {
            Log.w("DHA", "Si aici mere!");
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setUseCaches(false);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Host", "poi.gps.ro");
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=*****");
            outputStream = new DataOutputStream(connection.getOutputStream());
            outputStream.writeBytes(twoHyphens + boundary + lineEnd);
            outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + "PICT0000" +"\"" + lineEnd);
            outputStream.writeBytes(lineEnd);
            outputStream.write(btarr.toByteArray());
            outputStream.writeBytes(lineEnd);
            outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
            Log.w("DHA", "Incep trimiterea pozei!");
            outputStream.flush();
            outputStream.close();
            int serverResponseCode = connection.getResponseCode();
            String conn = connection.getResponseMessage();
        //  InputStream in  = connection.getInputStream();
        //  StringWriter writer = new StringWriter();

            Log.w("DHA", conn);
            Log.w("DHA", "Serverul a raspuns cu " + String.valueOf(serverResponseCode));
            if (serverResponseCode == 200)
            {
                AlertDialog alertDialog;
                alertDialog = new AlertDialog.Builder(this).create();
                alertDialog.setTitle("Super :)");
                alertDialog.setMessage("Poza a fost trimisa cu success.");
                alertDialog.setButton("Ok", new DialogInterface.OnClickListener() {

                      public void onClick(DialogInterface dialog, int id) {

                         finish();

                    } }); 
                alertDialog.show();

            }


}
    }
    dialog.dismiss();
}

Answer 1

正如大卫所说，你需要一个AsynTask，最实用的选择。您可以使用 Void，Void，Void 部分做一些聪明的事情，但除非您想查看文档，否则这应该可以正常工作。

public class MyActivity extends Activity {

....

    private final class AsyncSender extends AsyncTask<Void, Void, Void> {

        ProgressDialog pd;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            pd = new ProgressDialog(MyActivity.this);
            pd.setTitle("Sending Data");
            pd.setMessage("Please wait, data is sending");
            pd.setCancelable(false);
            pd.setIndeterminate(true);
            pd.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            send_data(); // You probably have to try/catch this
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            pd.dismiss();
        }
    }
}

然后当你打电话时，最干净的方法是打电话

new AsyncSender().execute();

另外，我应该提一下，这应该是一个内部类，这意味着不要为它创建一个单独的java文件。通常我只是将它们粘贴在我正在使用的类文件的底部。

Answer 2

您使用上传代码阻止了用户界面。您需要使用AsyncTask / thread / service。

Painless Threading

Answer 3

首先，您调用ProgressDialog.show（）两次，这是不必要的。也许它没有表现出来的一个原因是因为它在展示之后就被解雇了。例如，如果您的文件上传速度非常快或失败，或者在另一个线程中完成，则会调用dismiss（），以便您无法看到对话框。

Answer 4

如果您想在后台执行任何任务并希望在屏幕上显示其他内容，则应使用 AsyncTask ...

这是使用AsyncTask登录的一个例子，现在你可以更新它......

public class mytask extends AsyncTask<Object, Object, Object> {

    String METHOD_NAME = "Login";
    String NAMESPACE = "http://tempuri.org/";
    SoapObject request;
    String SOAP_ACTION = "http://tempuri.org/Login";
    @Override
    protected Object doInBackground(Object... params) {
        Log.d(TAG, "doInBackground(Void... params");
        Object flag = null;
        try {
            flag = TAGS.sendToServerAndGetResponse(request, SOAP_ACTION);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        }
        return flag;
    }

    @Override
    protected void onPostExecute(Object result) {
        if (result.toString().equalsIgnoreCase("true")) {

            mIntent = new Intent();
            mIntent.setClass(PresenTABActivity.this,
                    presentation_list.class);
            startActivity(mIntent);
            finish();
        } else {
            Toast.makeText(getApplicationContext(),
                    "Please Enter Valid Username or Password",
                    Toast.LENGTH_SHORT).show();
            edtPass.setVisibility(View.VISIBLE);
            edtUname.setVisibility(View.VISIBLE);
            chk_remeber_me.setVisibility(View.VISIBLE);
            btnSubmit.setVisibility(View.VISIBLE);
            mProgressBar.setVisibility(View.INVISIBLE);
            loading.setVisibility(View.INVISIBLE);
        }
    }

    @Override
    protected void onPreExecute() {
        Log.d(TAG, "onPreExecute()");
        request = new SoapObject(NAMESPACE, METHOD_NAME);
        request.addProperty("Username", edtUname.getText().toString()
                .trim());
        request.addProperty("password", edtPass.getText().toString().trim());

        mProgressBar = (ProgressBar) findViewById(R.id.progress_login);
        loading = (TextView) findViewById(R.id.tv_loading);
        loading.setVisibility(View.VISIBLE);
        mProgressBar.setVisibility(View.VISIBLE);

        edtPass.setVisibility(View.INVISIBLE);
        edtUname.setVisibility(View.INVISIBLE);

        chk_remeber_me.setVisibility(View.INVISIBLE);
    }
}

Answer 5

查看此页面：http://www.vogella.com/articles/AndroidPerformance/article.html

实施例

private class UploadingTask extends AsyncTask<Void, Void, Void> {

private ProgressDialog mProgressDialog;

    @Override
    protected void onPreExecute() {
        mProgressDialog = ProgressDialog.show(this, title, message, true);
    }

    @Override
    protected Void doInBackground(final Void... params) {
        // Do your work .. uploading
        return null;
    }

    @Override
    protected void onPostExecute(final Void result) {
        if (mProgressDialog != null) {
        mProgressDialog.dismiss();
        }
    }
}

上传文件时显示加载对话框android

5 个答案: