Java 从MySQL到Android应用程序获取数据

我想使用PHP从MySQL数据库获取数据，并在Android活动中显示它。我编写代码并传递JSON数组，但有一个问题我不知道如何连接到服务器，我的所有数据库都在本地服务器上。我编码它，请告诉我哪里出了问题，这样我就可以得到准确的结果。我会非常感谢你的

my all数据库位于localhost中，未打开活动。显示错误“意外停止”：（如何获得准确结果。请指导我）

现在它给出了以下错误：（和）加载保存的详细信息

    12-08 11:09:19.314: E/WindowManager(19972): Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40555850 that was originally added here
12-08 11:09:19.314: E/WindowManager(19972): android.view.WindowLeaked: Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40555850 that was originally added here
12-08 11:09:19.314: E/WindowManager(19972):     at android.view.ViewRoot.<init>(ViewRoot.java:277)
12-08 11:09:19.314: E/WindowManager(19972):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
12-08 11:09:19.314: E/WindowManager(19972):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
12-08 11:09:19.314: E/WindowManager(19972):     at android.view.Window$LocalWindowManager.addView(Window.java:433)
12-08 11:09:19.314: E/WindowManager(19972):     at android.app.Dialog.show(Dialog.java:288)
12-08 11:09:19.314: E/WindowManager(19972):     at com.example.visit.record.My_Task$GetTaskDetails.onPreExecute(My_Task.java:149)
12-08 11:09:19.314: E/WindowManager(19972):     at android.os.AsyncTask.execute(AsyncTask.java:391)
12-08 11:09:19.314: E/WindowManager(19972):     at com.example.visit.record.My_Task.onCreate(My_Task.java:107)
12-08 11:09:19.314: E/WindowManager(19972):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
12-08 11:09:19.314: E/WindowManager(19972):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)
12-08 11:09:19.314: E/WindowManager(19972):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
12-08 11:09:19.314: E/WindowManager(19972):     at android.app.ActivityThread.access$1500(ActivityThread.java:132)
12-08 11:09:19.314: E/WindowManager(19972):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
12-08 11:09:19.314: E/WindowManager(19972):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-08 11:09:19.314: E/WindowManager(19972):     at android.os.Looper.loop(Looper.java:143)
12-08 11:09:19.314: E/WindowManager(19972):     at android.app.ActivityThread.main(ActivityThread.java:4268)
12-08 11:09:19.314: E/WindowManager(19972):     at java.lang.reflect.Method.invokeNative(Native Method)
12-08 11:09:19.314: E/WindowManager(19972):     at java.lang.reflect.Method.invoke(Method.java:507)
12-08 11:09:19.314: E/WindowManager(19972):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-08 11:09:19.314: E/WindowManager(19972):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-08 11:09:19.314: E/WindowManager(19972):     at dalvik.system.NativeStart.main(Native Method)

12-08 11:09:19.314:E/WindowManager（19972）：Activity com.example.visit.record.My_任务泄漏了window com.android.internal.policy.impl.PhoneWindow$DecorView@40555850原来是加在这里的
12-08 11:09:19.314:E/WindowManager（19972）：android.view.WindowLeaked:Activity com.example.visit.record.My_任务泄漏了window com.android.internal.policy.impl.PhoneWindow$DecorView@40555850原来是加在这里的
12-08 11:09:19.314:E/WindowManager（19972）：在android.view.ViewRoot（ViewRoot.java:277）
12-08 11:09:19.314:E/WindowManager（19972）：在android.view.WindowManagerImpl.addView（WindowManagerImpl.java:148）
12-08 11:09:19.314:E/WindowManager（19972）：在android.view.WindowManagerImpl.addView（WindowManagerImpl.java:91）
12-08 11:09:19.314:E/WindowManager（19972）：在android.view.Window$LocalWindowManager.addView（Window.java:433）
12-08 11:09:19.314:E/WindowManager（19972）：在android.app.Dialog.show（Dialog.java:288）
12-08 11:09:19.314:E/WindowManager（19972）：在com.example.visit.record.My_Task$GetTaskDetails.onPreExecute（My_Task.java:149）
12-08 11:09:19.314:E/WindowManager（19972）：在android.os.AsyncTask.execute（AsyncTask.java:391）
12-08 11:09:19.314:E/WindowManager（19972）：在com.example.visit.record.My_Task.onCreate（My_Task.java:107）
12-08 11:09:19.314:E/WindowManager（19972）：在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1093）
12-08 11:09:19.314:E/WindowManager（19972）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:1785）
12-08 11:09:19.314:E/WindowManager（19972）：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:1842）
12-08 11:09:19.314:E/WindowManager（19972）：在android.app.ActivityThread.access$1500（ActivityThread.java:132）
12-08 11:09:19.314:E/WindowManager（19972）：在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1038）
12-08 11:09:19.314:E/WindowManager（19972）：位于android.os.Handler.dispatchMessage（Handler.java:99）
12-08 11:09:19.314:E/WindowManager（19972）：位于android.os.Looper.loop（Looper.java:143）
12-08 11:09:19.314:E/WindowManager（19972）：在android.app.ActivityThread.main（ActivityThread.java:4268）
12-08 11:09:19.314:E/WindowManager（19972）：位于java.lang.reflect.Method.Invokenactive（本机方法）
12-08 11:09:19.314:E/WindowManager（19972）：位于java.lang.reflect.Method.invoke（Method.java:507）
12-08 11:09:19.314:E/WindowManager（19972）：位于com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:839）
12-08 11:09:19.314:E/WindowManager（19972）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:597）
12-08 11:09:19.314:E/WindowManager（19972）：在dalvik.system.NativeStart.main（本机方法）

目前，您正在尝试访问Ui元素或

doInBackground

中的

doInBackground

中的

AsyncTask

类。因为无法从

doInBackground

访问Ui元素，所以可以对upda使用

onPreExecute

和

onPostExecute

ting UI元素。将代码更改为，而不使用

runOnUiThread

或

doInBackground

中的UI元素：

      class GetProductDetails extends AsyncTask<String, String, JSONObject> {

        /**
         * Before starting background thread Show Progress Dialog
         * */

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            tDialog = new ProgressDialog(My_Task.this);
            tDialog.setMessage("Loading task details. Please wait...");
            tDialog.setIndeterminate(false);
            tDialog.setCancelable(true);
            tDialog.show();
        }
   protected JSONObject doInBackground(String... params) {

                   JSONObject my_task 
                    // Check for success tag
                    int success;
                    try {
                        // Building Parameters
                        List<NameValuePair> params = new ArrayList<NameValuePair>();
                        params.add(new BasicNameValuePair("cid", cid));

                        // getting product details by making HTTP request
                        // Note that product details url will use GET request
                        JSONObject json = JSONParser.makeHttpRequest(
                                url_read_mytask, "GET", params);

                        // check your log for json response
                        Log.d("Single Task Details", json.toString());

                        // json success tag
                        success = json.getInt(TAG_SUCCESS);
                        if (success == 1) {
                            // successfully received product details
                            JSONArray my_taskObj = json
                                    .getJSONArray(TAG_MYTASK); // JSON Array

                            // get first product object from JSON Array
                            my_task = my_taskObj.getJSONObject(0);


                        }
                        else
                        {
                            // task with cid not found
                        }
                    } 
                    catch (JSONException e) {
                        e.printStackTrace();
                    }


            return my_task;
        }
        protected void onPostExecute(JSONObject my_task) {
            // dismiss the dialog once got all details

            // task with this cid found
            // Edit Text
             // display task data in EditText

             cus_name_txtbx = (EditText) findViewById(R.id.cus_name_txt);
             cus_name_txtbx.setText(my_task.getString(TAG_NAME));

             contact_no_txtbx = (EditText) findViewById(R.id.contact_no_txt);
             contact_no_txtbx.setText(my_task.getString(TAG_CONTACT));

             ticket_no_txtbx = (EditText) findViewById(R.id.ticket_no_txt);
             ticket_no_txtbx.setText(my_task.getString(TAG_TICKET));

             task_detail_txtbx = (EditText) findViewById(R.id.task_detail_txt);
             task_detail_txtbx.setText(my_task.getString(TAG_TASKDETAIL));
            tDialog.dismiss();
        }

---

有一件事是显而易见的。您不能从后台线程更改

UI

这是你在干什么

cus_name_txtbx = (EditText) findViewById(R.id.cus_name_txt);
                        cus_name_txtbx.setText(my_task.getString(TAG_NAME));

                        contact_no_txtbx = (EditText) findViewById(R.id.contact_no_txt);
                        contact_no_txtbx.setText(my_task.getString(TAG_CONTACT));

                        ticket_no_txtbx = (EditText) findViewById(R.id.ticket_no_txt);
                        ticket_no_txtbx.setText(my_task.getString(TAG_TICKET));

                        task_detail_txtbx = (EditText) findViewById(R.id.task_detail_txt);
                        task_detail_txtbx.setText(my_task.getString(TAG_TASKDETAIL));

---

在

GetProductDetails

@Mohsin的

doInBackground

中，对不起，我不理解“无法从后台更改UI”。我该怎么做才能获得所需的结果？等待您出现其他错误。什么是line

My_Task.java:82

？行号My_Task.onCreate（My_Task.java:82）在哪里在My_Task类中，第82行是：Attain_by_txtbx=（EditText）findViewById（R.id.Attain_by_txt）；然后查看My_Task xml布局并检查您是否具有EditText或TextView@Mona：我敢肯定，在您的布局或java代码中的某个地方，您正试图将文本视图转换为EditTextThank alot n alotρцσѕρєK:）

cus_name_txtbx = (EditText) findViewById(R.id.cus_name_txt);
                        cus_name_txtbx.setText(my_task.getString(TAG_NAME));

                        contact_no_txtbx = (EditText) findViewById(R.id.contact_no_txt);
                        contact_no_txtbx.setText(my_task.getString(TAG_CONTACT));

                        ticket_no_txtbx = (EditText) findViewById(R.id.ticket_no_txt);
                        ticket_no_txtbx.setText(my_task.getString(TAG_TICKET));

                        task_detail_txtbx = (EditText) findViewById(R.id.task_detail_txt);
                        task_detail_txtbx.setText(my_task.getString(TAG_TASKDETAIL));