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我的应用程序崩溃时提交注册页面，但logcat没有显示引起（我认为这可能是我的PHP服务器应用程序，使它全部崩溃，但我不确定）应用程序崩溃但是logcat显示没有引起︰
如果您有任何代码可以链接我以向您展示所有帮助解决此问题的信息，请发表评论，我会尽力帮助。
04-24 10:36:43.910: E/AndroidRuntime(8764): FATAL EXCEPTION: main
04-24 10:36:43.910: E/AndroidRuntime(8764): java.lang.NullPointerException
04-24 10:36:43.910: E/AndroidRuntime(8764): at com.loggedin.Login$ProcessLogin.onPostExecute(Login.java:173)
04-24 10:36:43.910: E/AndroidRuntime(8764): at com.loggedin.Login$ProcessLogin.onPostExecute(Login.java:1)
04-24 10:36:43.910: E/AndroidRuntime(8764): at android.os.AsyncTask.finish(AsyncTask.java:631)
04-24 10:36:43.910: E/AndroidRuntime(8764): at android.os.AsyncTask.access$600(AsyncTask.java:177)
04-24 10:36:43.910: E/AndroidRuntime(8764): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
04-24 10:36:43.910: E/AndroidRuntime(8764): at android.os.Handler.dispatchMessage(Handler.java:99)
04-24 10:36:43.910: E/AndroidRuntime(8764): at android.os.Looper.loop(Looper.java:176)
04-24 10:36:43.910: E/AndroidRuntime(8764): at android.app.ActivityThread.main(ActivityThread.java:5419)
04-24 10:36:43.910: E/AndroidRuntime(8764): at java.lang.reflect.Method.invokeNative(Native Method)
04-24 10:36:43.910: E/AndroidRuntime(8764): at java.lang.reflect.Method.invoke(Method.java:525)
04-24 10:36:43.910: E/AndroidRuntime(8764): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
04-24 10:36:43.910: E/AndroidRuntime(8764): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
04-24 10:36:43.910: E/AndroidRuntime(8764): at dalvik.system.NativeStart.main(Native Method)
登录页面代码
import android.app.ProgressDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.loggedin.internal.DatabaseHandler;
import com.loggedin.internal.UserFunctions;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class Login extends Activity {
Button btnLogin;
Button registerbtn1;
Button passwordresetbtn;
EditText inputUsername;
EditText inputPassword;
private TextView loginErrorMsg;
/**
* Called when the activity is first created.
*/
private static String KEY_SUCCESS = "success";
private static String KEY_UID = "id";
private static String KEY_USERNAME = "Username";
private static String KEY_FIRSTNAME = "FirstName";
private static String KEY_LASTNAME = "LastName";
private static String KEY_EMAIL = "email";
private static String KEY_DOB = "DOB";
private static String KEY_CREATED_AT = "created_at";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
inputUsername = (EditText) findViewById(R.id.Username);
inputPassword = (EditText) findViewById(R.id.Password);
registerbtn1 = (Button) findViewById(R.id.registerbtn1);
btnLogin = (Button) findViewById(R.id.loginbtn1);
passwordresetbtn = (Button)findViewById(R.id.passwordresetbtn);
loginErrorMsg = (TextView) findViewById(R.id.loginErrorMsg);
passwordresetbtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), PasswordReset.class);
startActivityForResult(myIntent, 0);
finish();
}});
registerbtn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(view.getContext(), Register.class);
startActivityForResult(myIntent, 0);
finish();
}});
/**
* Login button click event
* A Toast is set to alert when the Email and Password field is empty
**/
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if ( (!inputUsername.getText().toString().equals("")) && ( !inputPassword.getText().toString().equals("")))
{
InternetAsync(view);
}
else if ((!inputUsername.getText().toString().equals("")))
{
Toast.makeText(getApplicationContext(),
"Password field empty", Toast.LENGTH_SHORT).show();
}
else if ((!inputPassword.getText().toString().equals("")))
{
Toast.makeText(getApplicationContext(),
"USername field empty", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext(),
"Username and Password field are empty", Toast.LENGTH_SHORT).show();
}
}
});
}
/**
* Async Task to check whether internet connection is working.
**/
private class InternetCheck extends AsyncTask <String, String, Boolean> {
private ProgressDialog nDialog;
@Override
protected void onPreExecute(){
super.onPreExecute();
nDialog = new ProgressDialog(Login.this);
nDialog.setTitle("Checking Network");
nDialog.setMessage("Loading..");
nDialog.setIndeterminate(false);
nDialog.setCancelable(true);
nDialog.show();
}
@Override
protected Boolean doInBackground(String... args){
/**
* Gets current device state and checks for working internet connection by trying Google.
**/
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnected()) {
try {
URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
return true;
}
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return false;
}
@Override
protected void onPostExecute(Boolean th){
if(th == true){
nDialog.dismiss();
new ProcessLogin().execute();
}
else{
nDialog.dismiss();
loginErrorMsg.setText("Error in Network Connection");
}
}
}
/**
* Async Task to get and send data to My Sql database through JSON respone.
**/
private class ProcessLogin extends AsyncTask <String, String, JSONObject> {
private ProgressDialog pDialog;
String Username, Password;
@Override
protected void onPreExecute() {
super.onPreExecute();
inputUsername = (EditText) findViewById(R.id.Username);
inputPassword = (EditText) findViewById(R.id.Password);
Username = inputUsername.getText().toString();
Password = inputPassword.getText().toString();
pDialog = new ProgressDialog(Login.this);
pDialog.setTitle("Contacting Servers");
pDialog.setMessage("Logging in ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.loginUser(Username, Password);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
try {
if (json.getString(KEY_SUCCESS) != null) {
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
pDialog.setMessage("Loading User Space");
pDialog.setTitle("Getting Data");
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
/**
* Clear all previous data in SQlite database.
**/
UserFunctions logout = new UserFunctions();
logout.logoutUser(getApplicationContext());
db.addUser(json_user.getString(KEY_FIRSTNAME),json_user.getString(KEY_LASTNAME),json_user.getString(KEY_EMAIL),json_user.getString(KEY_DOB),json_user.getString(KEY_USERNAME),json_user.getString(KEY_UID));
/**
*If JSON array details are stored in SQlite it launches the User Panel.
**/
Intent upanel = new Intent(getApplicationContext(), Main.class);
upanel.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
pDialog.dismiss();
startActivity(upanel);
/**
* Close Login Screen
**/
finish();
}else{
pDialog.dismiss();
loginErrorMsg.setText("Incorrect username/password");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
的邮递区号或你会被downvoted – nikis
Login.java直插号173 - 空指针异常。看那条线。 – DmitryKanunnikoff
对不起尼基斯，我不确定错误来自哪里，我不想粘贴我的所有代码。谢谢德米特里我现在会在那里看看 – user3527907