Java 第65行上的NullPointerException强制关闭-saveContact();-计算空变量[Noob Warning]
问题:第65行强制关闭-saveContact() 注: 大家好,我正试图在数据库中保存一些数据,但应用程序一直在崩溃。我对这一切有点陌生,所以我想知道是否有人能解释我做错了什么。我相信这很简单。。。但我不知道如何修复它 非常感谢您的任何帮助 努布尼加Java 第65行上的NullPointerException强制关闭-saveContact();-计算空变量[Noob Warning],java,android,eclipse,sqlite,Java,Android,Eclipse,Sqlite,问题:第65行强制关闭-saveContact() 注: 大家好,我正试图在数据库中保存一些数据,但应用程序一直在崩溃。我对这一切有点陌生,所以我想知道是否有人能解释我做错了什么。我相信这很简单。。。但我不知道如何修复它 非常感谢您的任何帮助 努布尼加 import android.app.Activity; import android.app.AlertDialog; import android.os.AsyncTask; import android.os
import android.app.Activity;
import android.app.AlertDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.ViewGroup;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TimePicker;
public class AddEditCountry extends Activity {
private long rowID;
private EditText nameEt;
private EditText capEt;
private EditText codeEt;
private TimePicker timeEt;
private TimePicker minEt;
public static final String KEY_BUNDLE_TIME = "time";
public static final String KEY_BUNDLE_MIN = "min";
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.add_country);
nameEt = (EditText) findViewById(R.id.nameEdit);
capEt = (EditText) findViewById(R.id.capEdit);
codeEt = (EditText) findViewById(R.id.codeEdit);
timeEt = (TimePicker) findViewById(R.id.timeEdit);
minEt = (TimePicker) findViewById(R.id.minEdit);
Bundle extras = getIntent().getExtras();
if (extras != null)
{
rowID = extras.getLong("row_id");
nameEt.setText(extras.getString("name"));
capEt.setText(extras.getString("cap"));
codeEt.setText(extras.getString("code"));
timeEt.setCurrentHour(extras.containsKey(KEY_BUNDLE_TIME) ? extras.getInt(KEY_BUNDLE_TIME) : 0);
minEt.setCurrentMinute(extras.getInt("min"));
}
Button saveButton =(Button) findViewById(R.id.saveBtn);
saveButton.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
if (nameEt.getText().length() != 0)
{
AsyncTask<Object, Object, Object> saveContactTask =
new AsyncTask<Object, Object, Object>()
{
@Override
protected Object doInBackground(Object... params)
{
saveContact();
return null;
}
@Override
protected void onPostExecute(Object result)
{
finish();
}
};
saveContactTask.execute((Object[]) null);
}
else
{
AlertDialog.Builder alert = new AlertDialog.Builder(AddEditCountry.this);
alert.setTitle(R.string.errorTitle);
alert.setMessage(R.string.errorMessage);
alert.setPositiveButton(R.string.errorButton, null);
alert.show();
}
}
});
}
private void saveContact()
{
DatabaseConnector dbConnector = new DatabaseConnector(this);
if (getIntent().getExtras() == null)
{
dbConnector.insertContact(nameEt.getText().toString(),
capEt.getText().toString(),
timeEt.getCurrentHour().toString(),
minEt.getCurrentMinute().toString(),
codeEt.getText().toString(),
timePicker.getCurrentHour().toString(),
timePicker.getCurrentMinute().toString());
}
else
{
dbConnector.updateContact(rowID,
nameEt.getText().toString(),
capEt.getText().toString(),
timeEt.getCurrentHour().toString(),
minEt.getCurrentMinute().toString(),/* Storing as String*/
codeEt.getText().toString());
}
}
}
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
public class DatabaseConnector {
public static final String KEY_BUNDLE_TIME = "time";
public static final String KEY_BUNDLE_MIN = "min";
private static final String DB_NAME = "WorldCountries";
private SQLiteDatabase database;
private DatabaseOpenHelper dbOpenHelper;
public DatabaseConnector(Context context) {
dbOpenHelper = new DatabaseOpenHelper(context, DB_NAME, null, 1);
}
public void open() throws SQLException
{
//open database in reading/writing mode
database = dbOpenHelper.getWritableDatabase();
}
public void close()
{
if (database != null)
database.close();
}
public void insertContact(String name, String cap, String code, String time, String min)
{
ContentValues newCon = new ContentValues();
newCon.put("name", name);
newCon.put("cap", cap);
newCon.put("time", time);
newCon.put("min", min);
newCon.put("code", code);
newCon.put(AddEditCountry.KEY_BUNDLE_TIME, time);
newCon.put(AddEditCountry.KEY_BUNDLE_MIN, min);
open();
database.insert("country", null, newCon);
close();
}
public void updateContact(long id, String name, String cap,String code, String time, String min)
{
ContentValues editCon = new ContentValues();
editCon.put("name", name);
editCon.put("cap", cap);
editCon.put("time", time);
editCon.put("min", min);
editCon.put("code", code);
editCon.put(AddEditCountry.KEY_BUNDLE_TIME, time);
editCon.put(AddEditCountry.KEY_BUNDLE_MIN, min);
open();
database.update("country", editCon, "_id=" + id, null);
close();
}
public Cursor getAllContacts()
{
return database.query("country", new String[] {"_id", "name"},
null, null, null, null, "name");
}
public Cursor getOneContact(long id)
{
return database.query("country", null, "_id=" + id, null, null, null, null);
}
public void deleteContact(long id)
{
open();
database.delete("country", "_id=" + id, null);
close();
}
}
PROBLEMS:
timePicker cannot be resolved AddEditCountry.java line 104
minEdit cannot be resolved or is not a field AddEditCountry.java line 37
timePicker cannot be resolved AddEditCountry.java line 103
导入android.app.Activity;
导入android.app.AlertDialog;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.view.ViewGroup;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.FrameLayout;
导入android.widget.TimePicker;
公共课堂扩展活动{
私人长罗威德;
私有编辑文本名称;
私人编辑文本capEt;
私人编辑文本代码集;
私人计时器;
私人计时器地雷;
公共静态最终字符串键\u BUNDLE\u TIME=“TIME”;
公共静态最终字符串键\u BUNDLE\u MIN=“MIN”;
@凌驾
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.add_country);
nameEt=(EditText)findViewById(R.id.nameEdit);
capEt=(EditText)findViewById(R.id.capEdit);
codeEt=(EditText)findViewById(R.id.codeEdit);
timeEt=(TimePicker)findviewbyd(R.id.timeEdit);
minEt=(时间选择器)findViewById(R.id.minEdit);
Bundle extras=getIntent().getExtras();
如果(附加值!=null)
{
rowID=extras.getLong(“row_id”);
setText(extras.getString(“name”);
capEt.setText(附加getString(“cap”);
codeEt.setText(extras.getString(“代码”);
timeEt.setCurrentHour(extras.containsKey(KEY\u BUNDLE\u TIME)?extras.getInt(KEY\u BUNDLE\u TIME):0;
minEt.setCurrentMinute(额外的getInt(“min”));
}
按钮saveButton=(按钮)findViewById(R.id.saveBtn);
saveButton.setOnClickListener(新的OnClickListener(){
公共void onClick(视图v)
{
if(nameEt.getText().length()!=0)
{
AsyncTask saveContactTask=
新建异步任务()
{
@凌驾
受保护对象doInBackground(对象…参数)
{
saveContact();
返回null;
}
@凌驾
受保护的void onPostExecute(对象结果)
{
完成();
}
};
saveContactTask.execute((Object[])null;
}
其他的
{
AlertDialog.Builder alert=新建AlertDialog.Builder(AddEditCountry.this);
alert.setTitle(R.string.errorTitle);
alert.setMessage(R.string.errorMessage);
alert.setPositiveButton(R.string.errorButton,null);
alert.show();
}
}
});
}
私有void saveContact()
{
DatabaseConnector dbConnector=新的DatabaseConnector(此);
if(getIntent().getExtras()==null)
{
dbConnector.insertContact(nameEt.getText().toString(),
capEt.getText().toString(),
timeEt.getCurrentHour().toString(),
minEt.getCurrentMinute().toString(),
codeEt.getText().toString(),
timePicker.getCurrentHour().toString(),
timePicker.getCurrentMinute().toString());
}
其他的
{
dbConnector.updateContact(rowID,
nameEt.getText().toString(),
capEt.getText().toString(),
timeEt.getCurrentHour().toString(),
minEt.getCurrentMinute().toString(),/*存储为字符串*/
codeEt.getText().toString());
}
}
}
导入android.content.ContentValues;
导入android.content.Context;
导入android.database.Cursor;
导入android.database.SQLException;
导入android.database.sqlite.SQLiteDatabase;
公共类数据库连接器{
公共静态最终字符串键\u BUNDLE\u TIME=“TIME”;
公共静态最终字符串键\u BUNDLE\u MIN=“MIN”;
私有静态最终字符串DB_NAME=“WorldCountries”;
专用数据库;
私有数据库openhelper dbOpenHelper;
公共数据库连接器(上下文){
dbOpenHelper=newdatabaseopenhelper(上下文,DB_名称,null,1);
}
public void open()引发SQLException
{
//以读/写模式打开数据库
database=dbOpenHelper.getWritableDatabase();
}
公众假期结束()
{
if(数据库!=null)
close()数据库;
}
public void insertContact(字符串
minEt.getCurrentMinute().toString()
private TimePicker minEt;
03-24 00:49:10.643: E/AndroidRuntime(6809): at com.nfc.linkingmanager.AddEditCountry.saveContact(AddEditCountry.java:101)
findViewById(R.id.nameEdit).getText().toString()
dbConnector.insertContact(
findViewById(R.id.nameEdit).getText().toString(),
findViewById(R.id.nameEdit).getText().toString().getText().toString(),
etc...