Question

我正在创建一个应用程序，它首先从php服务器检索数据并以tablelayout的形式显示它。此外，我在tablelayout的每一行旁边添加了一个按钮，一旦用户按下按钮，该行的整个数据就会发送到服务器。

这是我的按钮代码

public void onClick(View v)
    {
        //  startActivity(f1);

        try {
            Addtocart();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }


    }



    void Addtocart(){
        try{

            httpclient=new DefaultHttpClient();
            httppost= new HttpPost("http://192.168.43.6/test/cart.php"); // make sure the url is correct.
            //add your data
            nameValuePairs = new ArrayList<NameValuePair>(2);
            // Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar,
            nameValuePairs.add(new BasicNameValuePair("product_code",q.getproduct_code().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("shaps",q.getShapes().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("pair",q.getpair().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("carats",q.getCarats().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("color",q.getColor().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("clarity",q.getClarity().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("service",q.getService().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("polish",q.getPolish().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("symetric",q.getSymetric().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("tables",q.getTables().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("measurments",q.getMeasurements().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("flourscne",q.getFlourscne().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("description",q.getDescription().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("certificated",q.getCerticated().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("ccode",q.getCcode().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("cut",q.getCut().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("total",q.getTotal().toString().trim()));
            nameValuePairs.add(new BasicNameValuePair("file",q.getFile().toString().trim()));// $Edittext_value = $_POST['Edittext_value'];

            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            //Execute HTTP Post Request
            response=httpclient.execute(httppost);

            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            final String response = httpclient.execute(httppost, responseHandler);
            System.out.println("Response : " + response);
            runOnUiThread(new Runnable() {
                public void run() {
                    tv.setText("Response from PHP : " + response);
                    dialog.dismiss();
                }
            });

            if(response.equalsIgnoreCase("add to cart")){
                runOnUiThread(new Runnable() {
                    public void run() {
                        Toast.makeText(Availability.this, "Add to cart successful", Toast.LENGTH_SHORT).show();
                    }
                });

               // startActivity(new Intent(Availability.this, LoginScreen.class));
            }else{
                showAlert();
            }

        }catch(Exception e){
            dialog.dismiss();
            System.out.println("Exception : " + e.getMessage());
        }
    }
    public void showAlert(){
        Availability.this.runOnUiThread(new Runnable() {
            public void run() {
                AlertDialog.Builder builder = new AlertDialog.Builder(Availability.this);
                builder.setTitle("Can't add to cart.");
                builder.setMessage("Problem in adding to cart. Please try again later")
                        .setCancelable(false)
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                            }
                        });
                AlertDialog alert = builder.create();
                alert.show();
            }
        });
    }

这是我在logcat中的错误代码

05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at com.diamond.traders.Availability.Addtocart(Availability.java:718)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at com.diamond.traders.Availability.onClick(Availability.java:652)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at android.view.View.performClick(View.java:4438)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at android.view.View$PerformClick.run(View.java:18422)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:733)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at android.os.Looper.loop(Looper.java:136)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5017)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-08 11:26:54.521  17918-17918/com.diamond.traders W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

这是我的整个代码 Availability

Answer 1

您没有提到错误类型，但错误是在线上可用性类别的数字718，即dialog.dismiss（）;那可能因为NULL指针异常所以在调用此检查之前是否您的对话框处于显示状态。
实施

如果（dialog.isShowing（））{ dialog.dismiss（）; }
检查对话框是否已初始化

如果（对话！= NULL）{ //你的代码在里面 }

将数据从Android应用程序传递到php服务器时出错

1 个答案: