我即将制作Android应用程序但由于FATAL EXCEPTION：主要应用程序在运行时继续停止
这是我的主要活动
package com.example.notepad.myapplication;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import java.util.List;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button ADD;
ListView li;
List<Note> notes;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ADD=(Button)findViewById(R.id.addnote);
ADD.setOnClickListener(this);
li= (ListView) findViewById(R.id.listview);
Databasehandler data =new Databasehandler(this);
notes= data.getAllNotes();
adaptor adapt=new adaptor(this,notes);
try {
li.setAdapter(adapt);
}catch (NullPointerException e){
Log.e("a","adaptor not found");
}
li.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l){
/* Intent intent=new Intent(MainActivity.this,EditNoteActivity.class);
Bundle bundle=new Bundle() ;
bundle.putString("source","editpress");
bundle.putString("noteTitle",note.getTitle());
bundle.putString("noteDescription",note.getDescription());
bundle.putInt("noteId",note.getId());
intent.putExtras(bundle);*/
}
}
);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.addnote:
Intent myIntent = new Intent(MainActivity.this, EditNoteActivity.class);
Bundle bundle = new Bundle();
bundle.putString("source", "addPress");
myIntent.putExtras(bundle);
startActivity(myIntent);
break;
default:
break;
}
}
}
这是我的数据库处理程序
package com.example.notepad.myapplication;
import android.database.Cursor;
import android.database.sqlite.SQLiteOpenHelper;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
public class Databasehandler {
DatabaseHandle data;
public Databasehandler(Context context) {
data=new DatabaseHandle(context);
}
/*public void DeleteNote(String id){
}*/
public void addnote() {
Note note = new Note();
SQLiteDatabase db = data.getWritableDatabase();
EditNoteActivity edit = new EditNoteActivity();
ContentValues values = new ContentValues();
values.put("title", note.getTitle());
values.put("description", note.getDescription());
db.insert(DatabaseHandle.TableName, null, values);
db.close();
}
public List<Note> getAllNotes() {
List<Note> notes=new ArrayList<Note>();
SQLiteDatabase db= data.getWritableDatabase();
Cursor c = db.query(DatabaseHandle.TableName, new String[] { DatabaseHandle.TableId,
DatabaseHandle.TableTitle, DatabaseHandle.TableDescription}, DatabaseHandle.TableId+ "=?",new String[] { String.valueOf(DatabaseHandle.TableId) } , null, null, null);
if(c!=null){
while (c.moveToNext()) {
int index0 = c.getColumnIndex(DatabaseHandle.TableId);
int index1 = c.getColumnIndex(DatabaseHandle.TableTitle);
int index2 = c.getColumnIndex(DatabaseHandle.TableDescription);
Note note = new Note();
note.setId(Integer.parseInt(c.getString(index0)));
note.setTitle(c.getString(index1));
note.setDescription(c.getString(index2));
notes.add(note);
}}
return notes;
}
static class DatabaseHandle extends SQLiteOpenHelper {
private static final String DatabaseName = "database";
private static final int DatabaseVersion = 3;
private static final String TableName = "notes";
private static final String TableId = "_id";
private static final String TableTitle = "title";
private static final String TableDescription = "description";
private static final String TableCreate = "CREATE TABLE IF NOT EXITS" + TableName + "(" + TableId + "INTEGER PRIMARY KEY AUTOINCREMENT" +
TableTitle + "TEXT " + TableDescription + "TEXT";
private static final String TableDrop = "DROP TABLE IF EXITS" + TableName;
DatabaseHandle(Context context) {
super(context, DatabaseName, null, DatabaseVersion);
}
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL(TableCreate);
} catch (SQLiteException e) {
e.printStackTrace();
Log.e("D", "table not created" );
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
try{ db.execSQL(TableDrop);
onCreate(db);}
catch (SQLiteException e){
Log.e("F","version not created");
}
}
}
}
这是我的编辑活动
package com.example.notepad.myapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.EditText;
import android.widget.Toast;
public class EditNoteActivity extends AppCompatActivity {
String A,B;
int id;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_notes);
EditText editText = (EditText) findViewById(R.id.editText2);
EditText editText1 = (EditText) findViewById(R.id.editText);
String A = editText.getText().toString();
String B = editText1.getText().toString();
Note note = new Note();
note.setDescription(A);
note.setTitle(B);
Bundle bundle=getIntent().getExtras();
if(bundle!=null && bundle.containsKey("source")){
if(bundle.getString("source").equalsIgnoreCase("editpress")){
isvalid();
id=bundle.getInt("noteId");
A=bundle.getString("noteTitle");
B=bundle.getString("noteDescription");
}else if(bundle.getString("source").equalsIgnoreCase("addPress")&& !isvalid()){
Databasehandler data=new Databasehandler(this);
data.addnote();
}else{
Toast.makeText(this,"invalid argument",Toast.LENGTH_SHORT).show();
super.onBackPressed();
}
}
}
public boolean isvalid(){
if(A.isEmpty()&&B.isEmpty()){
Toast.makeText(this,"please enter tittle and description",Toast.LENGTH_SHORT).show();
return false;
}
else if(A.isEmpty()){
Toast.makeText(this,"please enter title",Toast.LENGTH_SHORT).show();
return false;
}else if(B.isEmpty()){
Toast.makeText(this,"please enter description",Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
这是错误
08-07 15:14:46.966 2143-2143/com.example.notepad.myapplication E/SQLiteLog: (1) no such table: notes
08-07 15:14:46.967 2143-2143/com.example.notepad.myapplication D/AndroidRuntime: Shutting down VM
08-07 15:14:46.967 2143-2143/com.example.notepad.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.notepad.myapplication, PID: 2143
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.notepad.myapplication/com.example.notepad.myapplication.MainActivity}: android.database.sqlite.SQLiteException: no such table: notes (code 1): , while compiling: SELECT _id, title, description FROM notes WHERE _id=?
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
Caused by: android.database.sqlite.SQLiteException: no such table: notes (code 1): , while compiling: SELECT _id, title, description FROM notes WHERE _id=?
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1318)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1165)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1036)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1204)
at com.example.notepad.myapplication.Databasehandler.getAllNotes(Databasehandler.java:41)
at com.example.notepad.myapplication.MainActivity.onCreate(MainActivity.java:27)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
这里是吸气者和二传手
package com.example.notepad.myapplication;
public class Note {
public int id=0;
public String title="";
public String description="";
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title=title;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id=id;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
答案 0 :(得分：1)
private static final String TableCreate = "CREATE TABLE IF NOT EXITS " + TableName + "(" + TableId + "INTEGER PRIMARY KEY AUTOINCREMENT," +
TableTitle + "TEXT ," + TableDescription + "TEXT)";
错过逗号（，）并在存在关键字"CREATE TABLE IF NOT EXITS "+TableName
检查并更新
答案 1 :(得分：0)
我通过更改DatabaseName =“database.db”
解决了这个问题