Question

我是android的新手，现在我面临列表视图的一些问题，列表中有一些列表屏幕，当我点击其中任何一个名称时，它应该将该ID传递给另一个活动它必须根据代码从数据库中获取一些数据但我的活动正在停止......所以请任何人帮助我在这里...... alluseractivity连接到列表，显示一些列表，其工作，但员工详细说明活动有一些问题....我已经给了xml代码和PHP代码，所以请在这里帮助我.. 这里是logcat视图....... 还有一个问题先生在同一个代码中，当我试图更新事物并从重新开始运行时它停止到达此屏幕之前我在这里添加代码到empdetailsactivity所以请查看它并让我知道

     E/AndroidRuntime(803): android.os.NetworkOnMainThreadException
     android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
 libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
 libcore.io.IoBridge.connectErrno(IoBridge.java:127)
 libcore.io.IoBridge.connect(IoBridge.java:112)
     java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
 java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
 java.net.Socket.connect(Socket.java:842)

      org.apache.http.conn.scheme.PlainSocketFactory.connectSocket
     (PlainSocketFactory.java:119)
  org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(
      DefaultClientConnectionOperator.java:144)
 org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
     org.apache.http.impl.conn.AbstractPooledConnAdapter.open
      (AbstractPooledConnAdapter.java:119)
 org.apache.http.impl.client.DefaultRequestDirector.execute
     (DefaultRequestDirector.java:360)
 org.apache.http.impl.client.AbstractHttpClient.execute
     (AbstractHttpClient.java:555)
 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
 com.example.demo3.JSONParser.makeHttpRequest(JSONParser.java:61)
     com.example.demo3.EmpDetailsActivity$GetEmployeeDetails$1.run
        (EmpDetailsActivity.java:95)
 android.os.Handler.handleCallback(Handler.java:725)
 android.os.Handler.dispatchMessage(Handler.java:92)
 android.os.Looper.loop(Looper.java:137)
     android.app.ActivityThread.main(ActivityThread.java:5041)
 java.lang.reflect.Method.invokeNative(Native Method)
 java.lang.reflect.Method.invoke(Method.java:511)
 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
 dalvik.system.NativeStart.main(Native Method)




      public class AllUserActivity extends ListActivity {

        private ProgressDialog pDialog;


JSONParser jParser = new JSONParser();

ArrayList<HashMap<String, String>> employeesList;

private static String url_all_emp =       "http://10.0.2.2/get_all_employees.php";


private static final String TAG_SUCCESS = "success";
private static final String TAG_EMPLOYEES = "emp";
private static final String TAG_EID = "eid";
private static final String TAG_NAME = "username";


JSONArray employees = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.all_employees);
    // Hashmap for ListView
    employeesList = new ArrayList<HashMap<String, String>>();

    new LoadAllProducts().execute();
            ListView lv = getListView();

    lv.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView<?> parent, View view,int position, long id) {

    String eid = ((TextView) view.findViewById(R.id.eid)).getText().toString();   

            Intent in = new Intent(getApplicationContext(),EmpDetailsActivity.class);
                    in.putExtra(TAG_EID, eid);


                    startActivityForResult(in, 100);
                }
            });}

    class LoadAllProducts extends AsyncTask<String, String, String> {


        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(AllUserActivity.this);
            pDialog.setMessage("Loading employees. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }


        protected String doInBackground(String... args) {

            List<NameValuePair> params = new ArrayList<NameValuePair>();

    JSONObject json = jParser.makeHttpRequest(url_all_emp, "GET", params);


            Log.d("All Employees: ", json.toString());

            try {

                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {

                employees = json.getJSONArray(TAG_EMPLOYEES);


            for (int i = 0; i < employees.length(); i++) {
                JSONObject c = employees.getJSONObject(i);


                String eid = c.getString(TAG_EID);
                String username = c.getString(TAG_NAME);


            HashMap<String, String> map = new HashMap<String, String>();


                        map.put(TAG_EID, eid);
                        map.put(TAG_NAME, username);


                        employeesList.add(map);
                    }
                } else {


                Intent i = new Intent(getApplicationContext(),
                            MainActivity.class);

                    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(i);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }


        protected void onPostExecute(String file_url) {

            pDialog.dismiss();

            runOnUiThread(new Runnable() {
                public void run() {

            ListAdapter adapter = new SimpleAdapter(
                AllUserActivity.this, employeesList,
        R.layout.list_item, new String[] { TAG_EID,TAG_NAME},
                    new int[] { R.id.eid, R.id.username });

                    setListAdapter(adapter);
                }
            });

        }

    }

           }





             public class EmpDetailsActivity extends Activity
                {
EditText txtName;
EditText txtfname;
EditText txtlname;
EditText txtpwd;
EditText txtloc;

EditText txtcnct;
String eid;


private ProgressDialog pDialog;


JSONParser jsonParser = new JSONParser();

private static final String url_get_emp =    "http://10.0.2.2/img1/get_emp_det.php";
private static final String url_update_emp = "http://10.0.2.2/img1/update_emp.php";
private static final String TAG_SUCCESS = "success";
private static final String TAG_EMPLOYEE = "emp";
private static final String TAG_EID = "eid";
private static final String TAG_NAME = "username";
private static final String TAG_FNAME = "firstname";
private static final String TAG_LNAME = "lastname";
private static final String TAG_PWD = "password";


private static final String TAG_LOC = "location";
private static final String TAG_CNCT= "contact";

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.edit_employee);
    if (android.os.Build.VERSION.SDK_INT > 9){ StrictMode.ThreadPolicy policy = new
    StrictMode.ThreadPolicy.Builder().permitAll().build();
         StrictMode.setThreadPolicy(policy);
     }
        Intent i = getIntent();

    eid = i.getStringExtra(TAG_EID);

    new GetEmployeeDetails().execute();
        btnSave.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {
            // starting background task to update employee
            new SaveemployeeDetails().execute();
        }
    });
}

class GetEmployeeDetails extends AsyncTask<String, String, String> {



    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(EmpDetailsActivity.this);
        pDialog.setMessage("Loading employee details. Please wait...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    protected String doInBackground(String... params) {


        runOnUiThread(new Runnable() {
            public void run() {

                int success;
                try {

        List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("eid", eid));


                JSONObject json = jsonParser.makeHttpRequest(
                        url_get_emp, "GET", params);


                Log.d("Single employee Details", json.toString());


                    success = json.getInt(TAG_SUCCESS);
                    if (success == 1) {

            JSONArray employeeObj = json
                    .getJSONArray(TAG_EMPLOYEE); 


                JSONObject employee = employeeObj.getJSONObject(0);



                txtName = (EditText) findViewById(R.id.inputName);                  
                txtfname = (EditText) findViewById(R.id.inputfName);
                txtcnct = (EditText) findViewById(R.id.cnct);
                txtpwd = (EditText) findViewById(R.id.pwd);
                txtlname= (EditText) findViewById(R.id.inputlName);
                txtloc = (EditText) findViewById(R.id.loc);



                txtName.setText(employee.getString(TAG_NAME));
                txtfname.setText(employee.getString(TAG_FNAME));
                txtlname.setText(employee.getString(TAG_LNAME));
                txtpwd.setText(employee.getString(TAG_PWD));
                txtjob.setText(employee.getString(TAG_JOB));
                txtloc.setText(employee.getString(TAG_LOC));
                txtcnct.setText(employee.getString(TAG_CNCT));
                        }else{

                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });

        return null;
    }



    protected void onPostExecute(String file_url) {
        // dismiss the dialog once got all details
        pDialog.dismiss();
    }
 }

   class SaveemployeeDetails extends AsyncTask<String, String, String> {


    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(EmpDetailsActivity.this);
        pDialog.setMessage("Saving employee ...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }


    protected String doInBackground(String... args) {

        // getting updated data from EditTexts
        String name = txtName.getText().toString();
        String fname = txtfname.getText().toString();
        String lname = txtlname.getText().toString();
        String cnct = txtcnct.getText().toString();
        String pwd = txtpwd.getText().toString();
        String loc = txtloc.getText().toString();


        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair(TAG_EID, eid));
        params.add(new BasicNameValuePair(TAG_NAME, name));
        params.add(new BasicNameValuePair(TAG_FNAME, fname));
        params.add(new BasicNameValuePair(TAG_LNAME, lname));
        params.add(new BasicNameValuePair(TAG_PWD, pwd));
        params.add(new BasicNameValuePair(TAG_CNCT, cnct));
        params.add(new BasicNameValuePair(TAG_LOC, loc));


        // sending modified data through http request
        // Notice that update employee url accepts POST method
        JSONObject json = jsonParser.makeHttpRequest(url_update_employee,
                "POST", params);

        // check json success tag
        try {
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) {
                // successfully updated
                Intent i = getIntent();

                setResult(100, i);
                finish();
            } else {
                // failed to update employee
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;
    }



    protected void onPostExecute(String file_url) {
        // dismiss the dialog once employee uupdated
        pDialog.dismiss();
    }
}


     }

       <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <!-- Name Label -->
    <TextView android:layout_width="fill_parent"
      android:layout_height="wrap_content"
    android:text="Employee Name"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="10dip"
    android:textSize="17dip"/>

     <!-- Input Name -->
<EditText android:id="@+id/inputName"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dip"
    android:layout_marginBottom="15dip"
    android:singleLine="true"/>

 <!-- Name Label -->
    <TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Employee fName"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="10dip"
    android:textSize="17dip"/>

   <!-- Input Name -->
<EditText android:id="@+id/inputfName"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dip"
    android:layout_marginBottom="15dip"
    android:singleLine="true"/>

 <!-- Name Label -->
     <TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Employee lName"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="10dip"
    android:textSize="17dip"/>

      <!-- Input Name -->
<EditText android:id="@+id/inputlName"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dip"
    android:layout_marginBottom="15dip"
    android:singleLine="true"/>


 <!-- Name Label -->
    <TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Employee pwd"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="10dip"
    android:textSize="17dip"/>

     <!-- Input Name -->
<EditText android:id="@+id/pwd"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dip"
    android:layout_marginBottom="15dip"
    android:singleLine="true"/>

 <!-- Name Label -->
    <TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Employee cnct"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="10dip"
    android:textSize="17dip"/>

     <!-- Input Name -->
<EditText android:id="@+id/cnct"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dip"
    android:layout_marginBottom="15dip"
    android:singleLine="true"/>


<!-- salary Label -->
    <TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="loc"
    android:paddingLeft="10dip"
    android:paddingRight="10dip"
    android:paddingTop="10dip"
    android:textSize="17dip"/>

    <!-- Input salary -->
<EditText android:id="@+id/loc" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dip"
    android:layout_marginBottom="15dip"
    android:gravity="top"/>



<LinearLayout android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

   <Button android:id="@+id/btnSave" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/save_changes"
    android:layout_weight="1"/>


</LinearLayout>

     </LinearLayout>

   <?php




  $response = array();
  require_once __DIR__ . '/db_connect.php';


   $db = new DB_CONNECT();
  if (isset($_GET["eid"])) {
   $eid = $_GET['eid'];


   $result = mysql_query("SELECT * FROM userss WHERE eid = $eid");

   if (!empty($result)) {

    if (mysql_num_rows($result) > 0) {

        $result = mysql_fetch_array($result);

        $emp = array();
        $emp["eid"] = $result["eid"];
      $emp["firstname"] = $result["firstname"];
  $emp["lastname"] = $result["lastname"];
        $emp["username"] = $result["username"];
        $emp["password"] = $result["password"];
        $emp["location"] = $result["location"];
        $emp["contact"] = $result["contact"];
        // success
        $response["success"] = 1;

        // user node
        $response["emp"] = array();

        array_push($response["emp"], $emp);

        // echoing JSON response
        echo json_encode($response);
    } else {
        // no emp found
        $response["success"] = 0;
        $response["message"] = "No emp found";

        // echo no users JSON
        echo json_encode($response);
      }
    } else {
    // no emp found
    $response["success"] = 0;
    $response["message"] = "No emp found";

    // echo no users JSON
    echo json_encode($response);
     }
    } else {

   $response["success"] = 0;
   $response["message"] = "Required field(s) is missing";


   echo json_encode($response);
   }
        ?>

Answer 1

  Put the below code just below the setContentView() in your activity.

    if (android.os.Build.VERSION.SDK_INT > 9) {
                StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
                StrictMode.setThreadPolicy(policy);
            }

If error comes after saving your application then just mouseover the error and add  @SuppressLint("NewApi")(Eclipse will give you option on mouse over).For example you will get an error on the word "build".Inform me if it works.

Answer 2

您不能在主线程上进行任何网络调用，创建单独的线程或asynctask以及网络调用。

在你的后台取出runOnUiThread。

Answer 3

表示空指针异常.... 首先，您必须检查清单文件并添加新类的活动，并且还要在类文件中正确包含xml文件。有时空指针异常错误只是因为这个小错误而且如果仍然没有解决问题，那么在从一个页面传递到另一个页面之前调整参数。

android使用php脚本从数据库中检索值

3 个答案: