Java 价值
我正在尝试获取一些用户输入。更具体地说，我想让某人输入一个值作为速度，当我点击计算，然后我的if。。。否则，if structures将计算最终支付的罚款金额并显示 然后，当我单击“保存”时，这些输入数据（包括罚款结果）应上传到我的SAL数据库 不幸的是，当我单击“保存”时，我会看到一长串错误。。。如果有人能指出我做错了什么，这样我就能从错误中吸取教训，那就太好了。这是我第一次这样做，所以我有点迷路了 在下面找到我的Java代码：Java 价值,java,android-asynctask,Java,Android Asynctask,我正在尝试获取一些用户输入。更具体地说，我想让某人输入一个值作为速度，当我点击计算，然后我的if。。。否则，if structures将计算最终支付的罚款金额并显示 然后，当我单击“保存”时，这些输入数据（包括罚款结果）应上传到我的SAL数据库 不幸的是，当我单击“保存”时，我会看到一长串错误。。。如果有人能指出我做错了什么，这样我就能从错误中吸取教训，那就太好了。这是我第一次这样做，所以我有点迷路了 在下面找到我的Java代码： import java.text.DecimalFormat;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.ProgressDialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.ProgressDialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.os.AsyncTask
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.DatePicker;
import android.widget.TimePicker;
import android.widget.ViewSwitcher;
import android.app.Dialog;
import java.text.*;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import com.finecalc.library.JSONParser;
import com.finecalc.ltafinecalculator.FineCalc.CreateNewFine;
public class FineCalc extends Activity {
private EditText speed;
private TextView Fine;
Button btnSelectDate,btnSelectTime;
static final int DATE_DIALOG_ID = 0;
static final int TIME_DIALOG_ID=1;
public int year,month,day,hour,minute;
private final int mYear, mMonth, mDay,mHour,mMinute;
// Button btnRegisterfine = (Button) findViewById(R.id.savefine);
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
EditText inputDriver;
EditText inputLicence;
EditText inputOfficer;
EditText inputSpeed;
EditText FineAppl;
EditText inputCategory;
TextView registerFine;
// url to create new fine
private static String url_create_fine = "http://192.168.43.183/androidltafj_api/create_fine.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
public FineCalc()
{
// Assign current Date and Time Values to Variables
final Calendar c = Calendar.getInstance();
this.mYear = c.get(Calendar.YEAR);
this.mMonth = c.get(Calendar.MONTH);
this.mDay = c.get(Calendar.DAY_OF_MONTH);
this.mHour = c.get(Calendar.HOUR_OF_DAY);
this.mMinute = c.get(Calendar.MINUTE);
}
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.speed = (EditText) findViewById(R.id.editText3);
this.Fine = (TextView)findViewById(R.id.editText4);
this.btnSelectDate=(Button)findViewById(R.id.buttonSelectDate);
this.btnSelectTime=(Button)findViewById(R.id.buttonSelectTime);
this.inputDriver = (EditText) findViewById(R.id.editText1);
this.inputLicence = (EditText) findViewById(R.id.editText2);
this.inputOfficer = (EditText) findViewById(R.id.editText5);
this.inputSpeed = (EditText) findViewById(R.id.editText3);
this.FineAppl = (EditText) findViewById(R.id.editText4);
this.inputCategory = (EditText) findViewById(R.id.editText6);
this.registerFine = (TextView) findViewById(R.id.fineregistered);
// Create button
final Button btnRegisterfine = (Button) findViewById(R.id.savefine);
// Set ClickListener on btnSelectDate
this.btnSelectDate.setOnClickListener(new View.OnClickListener() {
public void onClick(final View v) {
// Show the DatePickerDialog
showDialog(DATE_DIALOG_ID);
}
});
// Set ClickListener on btnSelectTime
this.btnSelectTime.setOnClickListener(new View.OnClickListener() {
public void onClick(final View v) {
// Show the TimePickerDialog
showDialog(TIME_DIALOG_ID);
}
});
// button click event
btnRegisterfine.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View view) {
// creating new product in background thread
new CreateNewFine().execute();
}
});
}
/**
* Background Async Task to Create new product
* */
class CreateNewFine extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
FineCalc.this.pDialog = new ProgressDialog(FineCalc.this);
FineCalc.this.pDialog.setMessage("Registering Fine..");
FineCalc.this.pDialog.setIndeterminate(false);
FineCalc.this.pDialog.setCancelable(true);
FineCalc.this.pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(final String... args) {
final String driver = FineCalc.this.inputDriver.getText().toString();
final String licencenum = FineCalc.this.inputLicence.getText().toString();
final String officer = FineCalc.this.inputOfficer.getText().toString();
final String speed = FineCalc.this.inputSpeed.getText().toString();
final String fine= FineCalc.this.FineAppl.getText().toString();
final String category = FineCalc.this.inputCategory.getText().toString();
// Building Parameters
final List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("driver", driver));
params.add(new BasicNameValuePair("licencenum", licencenum));
params.add(new BasicNameValuePair("officer", officer));
params.add(new BasicNameValuePair("speed", speed));
params.add(new BasicNameValuePair("fine", fine));
params.add(new BasicNameValuePair("category", category));
// getting JSON Object
// Note that create product url accepts POST method
final JSONObject json = FineCalc.this.jsonParser.makeHttpRequest(url_create_fine, "POST", params);
// check log cat from response
Log.d("Create Response", json.toString());
// check for success tag
try {
final int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
final Intent i = new Intent(getApplicationContext(), UserLogin.class);
startActivity(i);
//registerFine.setText("Error occured in registration");
// closing this screen
finish();
} else {
// failed to create product
}
} catch (final JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(final String file_url) {
// dismiss the dialog once done
FineCalc.this.pDialog.dismiss();
}
}
public void ShowFine(final View clickedButton) {
final double SpeedKMh = (Integer.parseInt(this.speed.getText().toString()));
final TextView Result=(TextView)findViewById(R.id.editText6);
if ((SpeedKMh>=80) && (SpeedKMh<=99)){
final double TotalFine = 50;
this.Fine.setText(new DecimalFormat("##.##").format(TotalFine));
Result.setText("Speeding");
}
else if ((SpeedKMh>=56) && (SpeedKMh<=79)) {
final double TotalFine = 25;
this.Fine.setText(new DecimalFormat("##.##").format(TotalFine));
Result.setText("Medium Speed");
}
else if ((SpeedKMh>=40) && (SpeedKMh<=55)) {
final double TotalFine = 0;
this.Fine.setText(new DecimalFormat("##.##").format(TotalFine));
Result.setText("Slow");
}
else if (SpeedKMh<=39) {
final double TotalFine = 0;
this.Fine.setText(new DecimalFormat("##.##").format(TotalFine));
Result.setText("Very Slow");
}
else if (SpeedKMh>=100) {
final double TotalFine = 100;
this.Fine.setText(new DecimalFormat("##.##").format(TotalFine));
Result.setText("Over Speeding");
}
}
// Register DatePickerDialog listener
private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
// the callback received when the user "sets" the Date in the DatePickerDialog
public void onDateSet(DatePicker view, int yearSelected, int monthOfYear, int dayOfMonth) {
year = yearSelected;
month = monthOfYear+1;
day = dayOfMonth;
// Set the Selected Date in Select date Button
btnSelectDate.setText("Date selected: "+day+"/"+month+"/"+year);
}
};
// Register TimePickerDialog listener
private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
// the callback received when the user "sets" the TimePickerDialog in the dialog
public void onTimeSet(TimePicker view, int hourOfDay, int min) {
hour = hourOfDay;
minute = min;
// Set the Selected Date in Select date Button
btnSelectTime.setText("Time selected: "+hour+":"+minute);
}
};
// Method automatically gets Called when you call showDialog() method
@Override
protected Dialog onCreateDialog(final int id) {
switch (id) {
case DATE_DIALOG_ID:
// create a new DatePickerDialog with values you want to show
return new DatePickerDialog(this, this.mDateSetListener, this.mYear, this.mMonth, this.mDay);
// create a new TimePickerDialog with values you want to show
case TIME_DIALOG_ID:
return new TimePickerDialog(this, this.mTimeSetListener, this.mHour, this.mMinute, false);
}
return null;
}
}
根据您的日志，您的代码指向NullPointerException，这就是为什么JSONObject不能正确解析，因为它不能解析空数据。因此，请检查您的代码，确定哪个部分给出了NullPointerExceptionok，这样我就能够整理出NullPointerException。现在，iam在尝试注册时出现一个错误，即：08-03 23:00:46.060:E/JSON Parser1030:error parsing data org.JSON.JSONException:Value使用Logcat或任何其他方法检查您尝试解析的数据是否可解析。
08-03 18:25:50.288: E/JSON Parser(1190): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
08-03 18:25:50.298: E/AndroidRuntime(1190): FATAL EXCEPTION: AsyncTask #1
08-03 18:25:50.298: E/AndroidRuntime(1190): Process: com.finecalc.ltafinecalculator, PID: 1190
08-03 18:25:50.298: E/AndroidRuntime(1190): java.lang.RuntimeException: An error occured while executing doInBackground()
08-03 18:25:50.298: E/AndroidRuntime(1190): at android.os.AsyncTask$3.done(AsyncTask.java:300)
08-03 18:25:50.298: E/AndroidRuntime(1190): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
08-03 18:25:50.298: E/AndroidRuntime(1190): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
08-03 18:25:50.298: E/AndroidRuntime(1190): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
08-03 18:25:50.298: E/AndroidRuntime(1190): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
08-03 18:25:50.298: E/AndroidRuntime(1190): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
08-03 18:25:50.298: E/AndroidRuntime(1190): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
08-03 18:25:50.298: E/AndroidRuntime(1190): at java.lang.Thread.run(Thread.java:841)
08-03 18:25:50.298: E/AndroidRuntime(1190): Caused by: java.lang.NullPointerException
08-03 18:25:50.298: E/AndroidRuntime(1190): at com.finecalc.ltafinecalculator.FineCalc$CreateNewFine.doInBackground(FineCalc.java:187)
08-03 18:25:50.298: E/AndroidRuntime(1190): at com.finecalc.ltafinecalculator.FineCalc$CreateNewFine.doInBackground(FineCalc.java:1)
08-03 18:25:50.298: E/AndroidRuntime(1190): at android.os.AsyncTask$2.call(AsyncTask.java:288)
08-03 18:25:50.298: E/AndroidRuntime(1190): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-03 18:25:50.298: E/AndroidRuntime(1190): ... 4 more
08-03 18:25:51.628: E/WindowManager(1190): android.view.WindowLeaked: Activity com.finecalc.ltafinecalculator.FineCalc has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{b3f08e18 V.E..... R......D 0,0-642,345} that was originally added here
08-03 18:25:51.628: E/WindowManager(1190): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:348)
08-03 18:25:51.628: E/WindowManager(1190): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
08-03 18:25:51.628: E/WindowManager(1190): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
08-03 18:25:51.628: E/WindowManager(1190): at android.app.Dialog.show(Dialog.java:286)
08-03 18:25:51.628: E/WindowManager(1190): at com.finecalc.ltafinecalculator.FineCalc$CreateNewFine.onPreExecute(FineCalc.java:158)
08-03 18:25:51.628: E/WindowManager(1190): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
08-03 18:25:51.628: E/WindowManager(1190): at android.os.AsyncTask.execute(AsyncTask.java:535)
08-03 18:25:51.628: E/WindowManager(1190): at com.finecalc.ltafinecalculator.FineCalc$5.onClick(FineCalc.java:139)
08-03 18:25:51.628: E/WindowManager(1190): at android.view.View.performClick(View.java:4438)
08-03 18:25:51.628: E/WindowManager(1190): at android.view.View$PerformClick.run(View.java:18422)
08-03 18:25:51.628: E/WindowManager(1190): at android.os.Handler.handleCallback(Handler.java:733)
08-03 18:25:51.628: E/WindowManager(1190): at android.os.Handler.dispatchMessage(Handler.java:95)
08-03 18:25:51.628: E/WindowManager(1190): at android.os.Looper.loop(Looper.java:136)
08-03 18:25:51.628: E/WindowManager(1190): at android.app.ActivityThread.main(ActivityThread.java:5017)
08-03 18:25:51.628: E/WindowManager(1190): at java.lang.reflect.Method.invokeNative(Native Method)
08-03 18:25:51.628: E/WindowManager(1190): at java.lang.reflect.Method.invoke(Method.java:515)
08-03 18:25:51.628: E/WindowManager(1190): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-03 18:25:51.628: E/WindowManager(1190): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-03 18:25:51.628: E/WindowManager(1190): at dalvik.system.NativeStart.main(Native Method)