成功上传图片后不显示Toast消息

Question

我当前的代码成功上传了图像，但仍然没有显示Toast消息，提示Image uploaded successfully 。 成功上传图片后如何显示吐司消息？

这是我的代码

 public void onClick(View v) {
                        dialog = ProgressDialog.show(Camera.this, "", "Uploading file...", true);
                        new Thread() {
                            public void run() {
                                try {
                                    //Toast.makeText(getBaseContext(), "File is uploading...", Toast.LENGTH_LONG).show();
                                    if(imageUpload(globalUID, largeImagePath)) {
                                         Toast.makeText(getApplicationContext(), "Image uploaded", Toast.LENGTH_LONG).show();
                                     } else {
                                         Toast.makeText(getApplicationContext(), "Error uploading image", Toast.LENGTH_LONG).show();
                                     }
                                } catch (Exception e) {

                                }

                            }
                        }.start();

这是imageUpload方法

public boolean imageUpload(String uid, String imagepath) {
    boolean success = false;
    //Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
    Bitmap bitmapOrg = BitmapFactory.decodeFile(imagepath);
    ByteArrayOutputStream bao = new ByteArrayOutputStream();
    bitmapOrg.compress(Bitmap.CompressFormat.JPEG, 90, bao);

    byte [] ba = bao.toByteArray();
    String ba1=Base64.encodeToString(ba, 0);

    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    nameValuePairs.add(new BasicNameValuePair("image",ba1));
    nameValuePairs.add(new BasicNameValuePair("uid", uid));

    try {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://www.example.info/androidfileupload/index.php");
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        if(response != null) {
            Toast.makeText(getApplicationContext(), "File uploaded successfully", Toast.LENGTH_LONG).show();
            success = true;
        }
        is = entity.getContent();
    } catch(Exception e) {
        Log.e("log_tag", "Error in http connection "+e.toString());
    }
    dialog.dismiss();
    return success;
}

Answer 1

您正在尝试在非UI线程中显示Toast，因此看不到Toast

Task完成后使用Handler来显示Toast.its更好地使用AsyncTask。

使用AsyncTask， imageUpload code in DoinBackground(...) method and return boolean to onPostExxecute(),and You can display Toast in OnPostExecute Method.添加imageUpload code in DoinBackground(...) method and return boolean to onPostExxecute(),and You can display Toast in OnPostExecute Method.

Answer 2

我建议您实现AsyncTask ，这在android中被称为无痛线程 。

在您的情况下，您可以在doInBackground()方法内调用imageUpload（），从onPostExecute()方法显示Toast，而无需关心线程。

Answer 3

我不知道这是对还是错。 您可以尝试这样-

public void onClick(View v)
{
    ProgressDialog dialog = ProgressDialog.show(DummyUsageActivity.this, "", "Uploading file...", true);
    this.runOnUiThread(new Runnable() {
        public void run() {
            try {
                //Toast.makeText(getBaseContext(), "File is uploading...", Toast.LENGTH_LONG).show();
                if(imageUpload(globalUID, largeImagePath)) {
                     Toast.makeText(DummyUsageActivity.this, "Image uploaded", Toast.LENGTH_LONG).show();
                 } else {
                     Toast.makeText(DummyUsageActivity.this, "Error uploading image", Toast.LENGTH_LONG).show();
                 }
            } catch (Exception e) {

            }
        }
    });
}

我认为这会起作用。 按用户- 帕雷什Mayani和萨米尔Mangroliya建议为的AsyncTask也更好地做到这一点。