0
私はAndroidアプリケーションにAsyncTaskクラスを持っています。私のMainActivityは、そのクラスのメソッドを呼び出しますが、そうした場合、そのクラスのProgressDialogボックスに問題があります。 LoginSoapTask.javaAndroid AsyncTask with ProgressDialog - Nullオブジェクトリファレンス
MainActivity.java
public class MainActivity extends AppCompatActivity {
private String username;
private String password;
private EditText usernameField;
private EditText passwordField;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
usernameField = (EditText) findViewById(R.id.enterUsername);
passwordField = (EditText) findViewById(R.id.enterPassword);
passwordField.setTypeface(Typeface.DEFAULT);
passwordField.setTransformationMethod(new PasswordTransformationMethod());
loginButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
LoginSoapTask lert = new LoginSoapTask(getApplicationContext()); //THIS IS WHERE I'M HAVING THE PROBLEM (Line 103)
// lert.checkDetails(usernameField.getText().toString(), passwordField.getText().toString());
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
：ここ
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources$Theme android.content.Context.getTheme()' on a null object reference
at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:222)
at android.app.AlertDialog.<init>(AlertDialog.java:200)
at android.app.AlertDialog.<init>(AlertDialog.java:196)
at android.app.AlertDialog.<init>(AlertDialog.java:141)
at android.app.ProgressDialog.<init>(ProgressDialog.java:77)
at com.example.maindec.sme.LoginSoapTask.<init>(LoginSoapTask.java:30)
at com.example.maindec.sme.MainActivity$3.onClick(MainActivity.java:103)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
は、両方のクラスのコードの主要部分である：
この
は私が取得していますエラーですpublic class LoginSoapTask extends AsyncTask<Void, Void, Void> {
/*Web Service Details */
private String xmlProlog = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
public String username, password;
Context context;
public LoginSoapTask(Context c) {
context = c;
}
private final ProgressDialog dialog = new ProgressDialog(context); //THIS IS WHERE I AM HAVING THE PROBLEM!!!!!!!!! (Line 30)
protected void onPreExecute() {
this.dialog.setMessage("Verifying...");
dialog.show();
}
@Override
protected Void doInBackground(Void... params) {
return null;
}
protected void onPostExecute(Void result) {
// TextView tv = (TextView) findViewById(R.id.Result);
// tv.setText(test_string);
System.out.println(test_string);
if (this.dialog.isShowing()){
this.dialog.dismiss();
}
}
private String test_string;
@SuppressWarnings("deprecation")
public void WebServiceCallExample() {
String finalInput = "1:" + username.length() + ":" + username + ":2:" + password.length() + ":" + password + ":";
SoapObject Request = new SoapObject(NAMESPACE, METHOD_NAME);
Request.addProperty("credentials", finalInput);
/* Set the web service envelope */
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.setOutputSoapObject(Request);
System.out.println("Request::" + Request.toString());
HttpTransportSE httpTransport = new HttpTransportSE(URL);
try{
System.out.println("Lghung:" + SOAP_ACTION);
httpTransport.debug=true;
httpTransport.call(SOAP_ACTION, envelope);
String ss=httpTransport.responseDump;
//SoapObject sp = (SoapObject) envelope.getResponse();
SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
SoapObject resultsRequestSOAP = (SoapObject) envelope.bodyIn;
System.out.println("Response::" + resultsRequestSOAP.toString());
System.out.println(Request.getName());
test_string = xmlProlog + response.toString();
System.out.println(test_string);
}catch (Exception e){
System.out.println("Testing");
e.printStackTrace();
}
}
public void checkDetails(String givenUsername, String givenPassword) {
username = givenUsername;
password = givenPassword;
execute();
}
}
私は引用符を挿入して、「これは私が問題を抱えているところです」と言って、ちょっと頭を上げ始めました。
これを解決する方法がわかっている場合、PLEASE他のソリューションのリンクを投稿しないでください。この問題を直接解決できるコードで回答を投稿してください。私は文脈と関連しなければならない他の解決策を見てきましたが、私はどこにもいません。代わりに
LoginSoapTask lert = new LoginSoapTask(getApplicationContext());
の
onPreExcute（）で進捗ダイアログを作成します。 –
また、コンテキスト= cをthis.context = cに変更します。 –
@ Chosen1あなたはアプリケーション 'Context'を使うべきではありません。代わりに' this'を試してください。 – Bryan