로그인을 수락하는 내 안드로이드 응용 프로그램은 ruuning.It되지 않습니다 logcat.It에 다음과 같은 오류가 발생합니다. 그것을 해결할 수 없습니다. 도움이 될 것입니다. 나는 전체 code.If을 게시하고로그인 활동 안드로이드에서 실행되지 않음
04-22 17:42:55.786: W/dalvikvm(1353): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-22 17:42:55.956: E/AndroidRuntime(1353): FATAL EXCEPTION: main
04-22 17:42:55.956: E/AndroidRuntime(1353): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.abhineel.studentinfo/com.abhineel.studentinfo.LoginActivity}: java.lang.NullPointerException
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.os.Handler.dispatchMessage(Handler.java:99)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.os.Looper.loop(Looper.java:137)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-22 17:42:55.956: E/AndroidRuntime(1353): at java.lang.reflect.Method.invokeNative(Native Method)
04-22 17:42:55.956: E/AndroidRuntime(1353): at java.lang.reflect.Method.invoke(Method.java:511)
04-22 17:42:55.956: E/AndroidRuntime(1353): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-22 17:42:55.956: E/AndroidRuntime(1353): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-22 17:42:55.956: E/AndroidRuntime(1353): at dalvik.system.NativeStart.main(Native Method)
04-22 17:42:55.956: E/AndroidRuntime(1353): Caused by: java.lang.NullPointerException
04-22 17:42:55.956: E/AndroidRuntime(1353): at com.abhineel.studentinfo.LoginActivity.onCreate(LoginActivity.java:67)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.Activity.performCreate(Activity.java:5104)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-22 17:42:55.956: E/AndroidRuntime(1353): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-22 17:42:55.956: E/AndroidRuntime(1353): ... 11 more
사전에 덕분에 쇼를 로그 캣 특정 줄에서 떨어져 다른 오류가 다음 패키지 com.abhineel 파일이 also.My LoginActivity.java 좀 도와주십시오있다 .studentinfo;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class LoginActivity extends Activity implements OnClickListener{
private EditText user, pass;
private Button mSubmit, mRegister;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script location:
//localhost :
//testing on your device
//put your local ip instead, on windows, run CMD > ipconfig
//or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String LOGIN_URL = "http://xxx.xxx.x.x:1234/webservice/login.php";
//testing on Emulator:
private static final String LOGIN_URL = "http://10.0.2.2:80/androidProj/login.php";
//testing from a real server:
//private static final String LOGIN_URL = "http://www.yourdomain.com/webservice/login.php";
//JSON element ids from repsonse of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//setup input fields
user = (EditText)findViewById(R.id.usn);
pass = (EditText)findViewById(R.id.password);
//setup buttons
mSubmit = (Button)findViewById(R.id.login);
mRegister = (Button)findViewById(R.id.register);
//register listeners
mSubmit.setOnClickListener(LoginActivity.this);
mRegister.setOnClickListener(LoginActivity.this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.login:
new AttemptLogin().execute();
break;
case R.id.register:
Intent i = new Intent(LoginActivity.this, RegisterActivity.class);
startActivity(i);
break;
default:
break;
}
}
class AttemptLogin extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(LoginActivity.this);
pDialog.setMessage("Attempting login...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String username = user.getText().toString();
String password = pass.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
Log.d("request!", "starting");
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL, "POST", params);
// check your log for json response
Log.d("Login attempt", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Login Successful!", json.toString());
Intent i = new Intent(LoginActivity.this, ReadComments.class);
finish();
startActivity(i);
return json.getString(TAG_MESSAGE);
}else{
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null){
Toast.makeText(LoginActivity.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
파일에서 LoginActivity.java 줄 번호 67을 표시하십시오 – Vladimir
코드를 보여주십시오! – deleon
스택 트레이스를 읽으십시오! – njzk2