我的应用有一个An Activity，可以从MySql中检索数据，点击按钮编辑文本
编译时没有错误，并且logcat中有一些错误。对话框打开，继续运行几秒钟然后解除，但编辑文本字段没有被MySQL的数据填满。
这是我的代码
public class Update extends Activity {
EditText et_spid,et_fullname,et_address,et_sid,et_aadhar,et_dob,et_phone,et_pincode,et_price,et_status,et_spl ;
Spinner spinner;
Button update_button, go;
String spid;
InputStream is=null;
String result=null;
String line=null ;
String myJSON;
JSONArray peoples = null;
public static final String TAG_SUCCESS="success";
public static final String TAG_PROVIDERS = "providers";
public static final String TAG_SPID = "spid";
public static final String TAG_NAME = "Name";
public static final String TAG_ADDRESS = "Address";
public static final String TAG_PINCODE = "Pincode";
public static final String TAG_PHONENUMBER = "Phone_Number";
public static final String TAG_AADHARNUMBER = "Aadhar_Number";
public static final String TAG_PRICE = "price";
public static final String TAG_SPL = "spl";
public static final String TAG_STATUS = "status";
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.update);
et_spid = (EditText) findViewById(R.id.edittext_spid_insert);
et_fullname = (EditText) findViewById(R.id.edittext_name_insert);
et_address = (EditText) findViewById(R.id.edittext_address_insert);
et_pincode = (EditText) findViewById(R.id.edittext_pin_insert);
et_phone = (EditText) findViewById(R.id.edittext_phone_insert);
et_aadhar = (EditText) findViewById(R.id.edittext_aadhar_insert);
spinner = (Spinner) findViewById(R.id.spinner1);
et_price =(EditText) findViewById(R.id.edittext_sid_price);
et_status = (EditText) findViewById(R.id.edittext_sid_status);
et_spl =(EditText) findViewById(R.id.edittext_sid_speacialisation);
update_button = (Button) findViewById(R.id.button_update);
go = (Button)findViewById(R.id.button_go);
go.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
spid=et_spid.getText().toString();
new go().execute();
}
});
}
class go extends AsyncTask<String, String, String>
{
ProgressDialog progress;
String Url="http://192.168.2.7/myapp/update.php";
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
String res = "";
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
progress = ProgressDialog.show(Update.this, "Loading Details",
"Please wait..", false);
}
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
try {
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(Url);
nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("spid",spid));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("pass 1", "connection success ");
}
catch(Exception e)
{
Log.e("Fail 1", e.toString());
Toast.makeText(getApplicationContext(), "Invalid IP Address",
Toast.LENGTH_LONG).show();
}
try{
BufferedReader reader = new BufferedReader
(new InputStreamReader(is,"utf-8"),8);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
result = sb.toString();
Log.e("pass 2", "connection success ");
}
catch(Exception e)
{
Log.e("Fail 2", e.toString());
}
return res;
}
protected void onPostExecute(String response) {
myJSON = response ;
try
{
JSONObject jsonObj = new JSONObject(myJSON);
peoples = jsonObj.getJSONArray("result");
for (int i = 0; i < peoples.length(); i++) {
JSONObject c = peoples.getJSONObject(i);
String Name=(c.getString("Name"));
String Address=(c.getString("Address"));
String Pincode=(c.getString("Pincode"));
String Phone_Number=(c.getString("Phone_Number"));
String Aadhar_Number=(c.getString("Aadhar_Number"));
String price=(c.getString("price"));
String spl=(c.getString("spl"));
String status=(c.getString("status"));
et_fullname.setText(Name);
et_address.setText(Address);
et_pincode.setText(Pincode);
et_phone.setText(Phone_Number);
et_aadhar.setText(Aadhar_Number);
et_price.setText(price);
et_spl.setText(spl);
et_status.setText(status);
}
}
catch(Exception e)
{
e.printStackTrace();
}
progress.dismiss();
}
}
}
mysql_connect("localhost","root","");
mysql_select_db("myapp");
$spid = $_POST['spid'];
$sql="select * from services_provider_details1 WHERE Service_Provider_ID='$spid' " ;
$r=mysql_query($sql);
$result = array();
while($row=mysql_fetch_array($r))
{
array_push($result,
array('Name'=>$row[1],'Address'=>$row[2],'Pincode'=>$row[3],'Phone_Number'=>$row[4],'Aadhar_Number'=>$row[6],'price'=>$row[8],'spl'=>$row[9],'status'=>$row[10]));
}
echo json_encode(array("result"=>$result));
mysql_close();
?>
运行时程序的Logcat
04-10 13:24:57.105: W/Trace(1859): Unexpected value from nativeGetEnabledTags: 0
04-10 13:24:57.145: W/Trace(1859): Unexpected value from nativeGetEnabledTags: 0
04-10 13:24:57.145: W/Trace(1859): Unexpected value from nativeGetEnabledTags: 0
04-10 13:24:57.225: W/System.err(1859): org.json.JSONException: End of input at character 0 of
04-10 13:24:57.296: W/System.err(1859): at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
04-10 13:24:57.296: W/System.err(1859): at org.json.JSONTokener.nextValue(JSONTokener.java:97)
04-10 13:24:57.306: W/System.err(1859): at org.json.JSONObject.<init>(JSONObject.java:154)
04-10 13:24:57.325: W/System.err(1859): at org.json.JSONObject.<init>(JSONObject.java:171)
04-10 13:24:57.325: W/System.err(1859): at com.example.homerun.Update$go.onPostExecute(Update.java:197)
04-10 13:24:57.345: W/System.err(1859): at com.example.homerun.Update$go.onPostExecute(Update.java:1)
04-10 13:24:57.357: W/System.err(1859): at android.os.AsyncTask.finish(AsyncTask.java:631)
04-10 13:24:57.376: W/System.err(1859): at android.os.AsyncTask.access$600(AsyncTask.java:177)
04-10 13:24:57.376: W/System.err(1859): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
04-10 13:24:57.396: W/System.err(1859): at android.os.Handler.dispatchMessage(Handler.java:99)
04-10 13:24:57.396: W/System.err(1859): at android.os.Looper.loop(Looper.java:137)
04-10 13:24:57.406: W/System.err(1859): at android.app.ActivityThread.main(ActivityThread.java:5039)
04-10 13:24:57.426: W/System.err(1859): at java.lang.reflect.Method.invokeNative(Native Method)
04-10 13:24:57.436: W/System.err(1859): at java.lang.reflect.Method.invoke(Method.java:511)
04-10 13:24:57.436: W/System.err(1859): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-10 13:24:57.465: W/System.err(1859): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-10 13:24:57.465: W/System.err(1859): at dalvik.system.NativeStart.main(Native Method)
04-10 13:24:57.475: I/Choreographer(1859): Skipped 113 frames! The application may be doing too much work on its main thread.
04-10 13:24:58.285: W/Trace(1859): Unexpected value from nativeGetEnabledTags: 0
04-10 13:24:58.285: W/Trace(1859): Unexpected value from nativeGetEnabledTags: 0
请告诉我是否需要XML文件？
答案 0 :(得分：0)
主要问题似乎是服务器端的PHP代码，更具体地说是本节：
$spid=$_REQUEST['spid'];
$name=$_REQUEST['name'];
$address=$_REQUEST['address'];
$pin=$_REQUEST['pin'];
$phone=$_REQUEST['phone'];
$aadhar=$_REQUEST['aadhaar'];
$price=$_REQUEST['price'];
$spl=$_REQUEST['spl'];
$status=$_REQUEST['status'];
您不检查数组$_REQUEST中是否存在密钥，并且当密钥不存在时，它将触发通知。这是预期的行为。
要解决此问题，您应该更新每一行，以便检查该密钥是否存在，并且仅在密钥存在时才访问它：
$spid = isset($_REQUEST['spid']) ? $_REQUEST['spid'] : null;
在PHP 7中（你没有使用，因为你使用的是mysql_函数），你可以用更短的语法来做同样的事情：
$spid = $_REQUEST['spid'] ?? null;
由于您在查询的$spid子句中使用WHERE，因此您可能需要确保该字段存在。这也需要明确的检查。