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我想执行简单的窗体验证，因此我使用EditText.setError（）来通知用户错误的输入或空白字段。不幸的是，当我这样做时，它只会显示错误，当我在不完整的表单提交后再次点击该字段时。这很奇怪，因为我希望它一显示我点击按钮并形成不完整。安卓输入验证不能按预期工作
我相信它与验证代码的位置有关吗？以下是我的代码：
public class AddDiscountActivity extends Activity implements OnItemSelectedListener{
String shopCategory;
Spinner spinner;
String shopName;
String shopCity;
String shopLocation;
String discountRate;
String discountDuration;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.adddiscount_activity);
spinner = (Spinner) findViewById(R.id.categoriesSpinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.categoriesArray, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(this);
}
public void SubmitData(View view)
{
new PostDataAsyncTask().execute();
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id)
{
// TODO Auto-generated method stub
shopCategory = spinner.getItemAtPosition(pos).toString();
Log.v("SHOP CATEGORY***********: ", shopCategory);
}
public class PostDataAsyncTask extends AsyncTask<String, String, String>
{
ProgressDialog progressDialog;
@Override
protected void onPreExecute()
{
progressDialog= ProgressDialog.show(AddDiscountActivity.this, "Please Wait","Update Ads listings", true);
//do initialization of required objects objects here
};
@Override
protected String doInBackground(String... strings) {
// TODO Auto-generated method stub
try {
postAdData();
} catch (NullPointerException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String lenghtOfFile) {
// do stuff after posting data
super.onPostExecute(lenghtOfFile);
progressDialog.dismiss();
//Intent intent = new Intent(MainActivity.this, ThankYouAcitivty.class);
// startActivity(intent);
}
}
private void postAdData() throws JSONException{
try{
// url where the data will be posted
String postReceiverUrl = "http://hye.com/displaypost.php";
// HttpClient
HttpClient httpClient = new DefaultHttpClient();
// post header
HttpPost httpPost = new HttpPost(postReceiverUrl);
httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
// add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
//All user input
EditText shopNameEditText = (EditText)findViewById(R.id.shopName);
EditText shopLocationEditText = (EditText)findViewById(R.id.shopLocation);
EditText shopCityEditText = (EditText)findViewById(R.id.shopCity);
EditText discountRateEditText = (EditText)findViewById(R.id.shopDiscount);
EditText discountDurationEditText = (EditText)findViewById(R.id.shopDiscountDuration);
shopNameEditText.getText().toString();
shopLocationEditText.getText().toString();
shopCityEditText.getText().toString();
discountRateEditText.getText().toString();
discountDurationEditText.getText().toString();
/*******Fields Validation*********/
if(shopNameEditText.getText().toString().length() == 0)
shopNameEditText.setError("يجب ادخال اسم المحل");
if(shopLocationEditText.getText().toString().length() == 0)
shopLocationEditText.setError("يجب ادخال العنوان");
if(shopCityEditText.getText().toString().length() == 0)
shopCityEditText.setError("يجب ادخال المدينة");
if(discountRateEditText.getText().toString().length() == 0)
discountRateEditText.setError("يجب ادخال نسبة التخفيض");
/*********************************/
nameValuePairs.add(new BasicNameValuePair("name", shopName));
nameValuePairs.add(new BasicNameValuePair("location", shopLocation));
nameValuePairs.add(new BasicNameValuePair("city", shopCity));
nameValuePairs.add(new BasicNameValuePair("rate", discountRate));
nameValuePairs.add(new BasicNameValuePair("duration", discountDuration));
nameValuePairs.add(new BasicNameValuePair("category", shopCategory));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs,"UTF-8"));
// execute HTTP post request
HttpResponse response = httpClient.execute(httpPost);
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
String responseStr = EntityUtils.toString(resEntity).trim();
Log.v("", "Response: " + responseStr);
// you can add an if statement here and do other actions based on the response
}
} catch (IOException e) {
e.printStackTrace();
}
}
当我这样做，我只要一按一下按钮，应用程序崩溃。任何理由为什么或如何修复？ –
投掷nullpointerexception –
@sys_debug看到我更新的答案！如果仍然抛出任何异常让我知道！ –