应用程序在启动后立即关闭。我不知道我做错了什么。请帮助！
这是主要活动： -
package com.work.pets;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import data.PetContract.PetEntry;
import data.PetDbHelper;
public class Main extends Activity {
private PetDbHelper mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button addpet= (Button) findViewById(R.id.addpetbutton);
addpet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Main.this,Editor.class);
startActivity(intent);
}
});
mDbHelper=new PetDbHelper(this);
}
@Override
protected void onStart(){
super.onStart();
displayDatabaseInfo();
}
private void displayDatabaseInfo(){
PetDbHelper mDbHelper=new PetDbHelper(this);
SQLiteDatabase db=mDbHelper.getReadableDatabase();
Cursor cursor = db.rawQuery("SELECT * FROM" + PetEntry.TABLE_NAME, null);
try{
TextView displayView= (TextView) findViewById(R.id.text_view_pet);
displayView.setText("Number of rows" + cursor.getCount());
}finally{
cursor.close();
}
}
private void insertPet(){
SQLiteDatabase db= mDbHelper.getWritableDatabase();
ContentValues values= new ContentValues();
values.put(PetEntry.COLUMN_PET_NAME,"Toto");
values.put(PetEntry.COLUMN_PET_BREED,"terrier");
values.put(PetEntry.COLUMN_PET_GENDER,PetEntry.GENDER_MALE);
values.put(PetEntry.COLUMN_PET_WEIGHT,20);
long newRowId=db.insert(PetEntry.TABLE_NAME, null, values);
Log.v("Main", "New row id" + newRowId);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_catalog, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_insert_dummy_data:
insertPet();
displayDatabaseInfo();
return true;
case R.id.action_delete_all_entries:
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是第二项活动： -
package com.work.pets;
import android.app.Activity;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
import data.PetContract;
import data.PetContract.PetEntry;
import data.PetDbHelper;
public class Editor extends Activity {
private EditText mNameEditText;
private EditText mBreedEditText;
private EditText mWeightEditText;
private Spinner mGenderSpinner;
private int mGender=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.editorview);
mNameEditText=(EditText) findViewById(R.id.pet_name);
mBreedEditText=(EditText) findViewById(R.id.pet_breed);
mWeightEditText=(EditText) findViewById(R.id.pet_weight);
mGenderSpinner=(Spinner) findViewById(R.id.spinner);
setupSpinner();
}
private void setupSpinner() {
ArrayAdapter genderspinneradapter = ArrayAdapter.createFromResource(this, R.array.array_gender_options, android.R.layout.simple_dropdown_item_1line);
genderspinneradapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
mGenderSpinner.setAdapter(genderspinneradapter);
mGenderSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selection = (String) parent.getItemAtPosition(position);
if (!TextUtils.isEmpty(selection)) {
if (selection.equals("Male")) {
mGender = PetEntry.GENDER_MALE; // Male
} else if (selection.equals("Female")) {
mGender = PetEntry.GENDER_FEMALE; // Female
} else {
mGender = PetEntry.GENDER_UNKNOWN; // Unknown
}
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
mGender=0;
}
});
}
private void insertPet(){
String nameString = mNameEditText.getText().toString().trim();
String breedString = mBreedEditText.getText().toString().trim();
String weightString = mWeightEditText.getText().toString().trim();
int weight= Integer.parseInt(weightString);
PetDbHelper mDbHelper = new PetDbHelper(this);
SQLiteDatabase db= mDbHelper.getWritableDatabase();
ContentValues values= new ContentValues();
values.put(PetEntry.COLUMN_PET_NAME,nameString);
values.put(PetEntry.COLUMN_PET_BREED,breedString);
values.put(PetEntry.COLUMN_PET_GENDER,mGender);
values.put(PetEntry.COLUMN_PET_WEIGHT,weight);
long newRowId=db.insert(PetEntry.TABLE_NAME, null, values);
if(newRowId==-1){
Toast.makeText(this, "Error with saving pet", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, "Pet saved with roe id:"+newRowId, Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_editor, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_save:
insertPet();
finish();
return true;
case R.id.action_delete:
return true;
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是合同类： -
package data;
import android.provider.BaseColumns;
public final class PetContract {
private PetContract(){}
public static final class PetEntry implements BaseColumns{
public final static String TABLE_NAME="pets";
public final static String _ID= BaseColumns._ID;
public final static String COLUMN_PET_NAME="name";
public final static String COLUMN_PET_BREED="breed";
public final static String COLUMN_PET_GENDER="gender";
public final static String COLUMN_PET_WEIGHT="weight";
public static final int GENDER_UNKNOWN=0;
public static final int GENDER_MALE=1;
public static final int GENDER_FEMALE=2;
}
}
THIS IS THE HELPER CLASS:-
package data;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import data.PetContract.PetEntry;
public class PetDbHelper extends SQLiteOpenHelper{
private static final String DATABASE_NAME="shelter.db";
private static final int DATABASE_VERSION=1;
public PetDbHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String SQL_CREATE_PETS_TABLE="CREATE_TABLE"
+ PetEntry.TABLE_NAME + "("
+ PetEntry._ID + "INTEGER PRIMARY KEY AUTOINCREMENT,"
+ PetEntry.COLUMN_PET_NAME + "TEXT NOT NULL,"
+ PetEntry.COLUMN_PET_BREED + "TEXT,"
+ PetEntry.COLUMN_PET_GENDER + "INTEGER NOT NULL,"
+ PetEntry.COLUMN_PET_WEIGHT + "INTEGER NOT NULL DEFAULT 0);";
db.execSQL(SQL_CREATE_PETS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
这是错误日志： -
04-17 14:27:56.514: E/SQLiteLog(1403): (1) near "CREATE_TABLEpets": syntax error
04-17 14:27:56.518: D/AndroidRuntime(1403): Shutting down VM
04-17 14:27:56.518: W/dalvikvm(1403): threadid=1: thread exiting with uncaught exception (group=0xa62bd288)
04-17 14:27:56.518: E/AndroidRuntime(1403): FATAL EXCEPTION: main
04-17 14:27:56.518: E/AndroidRuntime(1403): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.work.pets/com.work.pets.Main}: android.database.sqlite.SQLiteException: near "CREATE_TABLEpets": syntax error (code 1): , while compiling: CREATE_TABLEpets(_idINTEGER PRIMARY KEY AUTOINCREMENT,nameTEXT NOT NULL,breedTEXT,genderINTEGER NOT NULL,weightINTEGER NOT NULL DEFAULT 0);
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.ActivityThread.access$600(ActivityThread.java:130)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.os.Handler.dispatchMessage(Handler.java:99)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.os.Looper.loop(Looper.java:137)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.ActivityThread.main(ActivityThread.java:4745)
04-17 14:27:56.518: E/AndroidRuntime(1403): at java.lang.reflect.Method.invokeNative(Native Method)
04-17 14:27:56.518: E/AndroidRuntime(1403): at java.lang.reflect.Method.invoke(Method.java:511)
04-17 14:27:56.518: E/AndroidRuntime(1403): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
04-17 14:27:56.518: E/AndroidRuntime(1403): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-17 14:27:56.518: E/AndroidRuntime(1403): at dalvik.system.NativeStart.main(Native Method)
04-17 14:27:56.518: E/AndroidRuntime(1403): Caused by: android.database.sqlite.SQLiteException: near "CREATE_TABLEpets": syntax error (code 1): , while compiling: CREATE_TABLEpets(_idINTEGER PRIMARY KEY AUTOINCREMENT,nameTEXT NOT NULL,breedTEXT,genderINTEGER NOT NULL,weightINTEGER NOT NULL DEFAULT 0);
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1663)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1594)
04-17 14:27:56.518: E/AndroidRuntime(1403): at data.PetDbHelper.onCreate(PetDbHelper.java:31)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
04-17 14:27:56.518: E/AndroidRuntime(1403): at com.work.pets.Main.displayDatabaseInfo(Main.java:54)
04-17 14:27:56.518: E/AndroidRuntime(1403): at com.work.pets.Main.onStart(Main.java:47)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.Activity.performStart(Activity.java:5018)
04-17 14:27:56.518: E/AndroidRuntime(1403): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2032)
04-17 14:27:56.518: E/AndroidRuntime(1403): ... 11 more
04-17 14:27:56.522: W/Act
ivityManager(325): Force finishing activity com.work.pets/.Main
答案 0 :(得分：0)
你忘记了这一部分的空间：
String SQL_CREATE_PETS_TABLE="CREATE_TABLE"
+ PetEntry.TABLE_NAME + "("
更改为：
String SQL_CREATE_PETS_TABLE="CREATE TABLE "
+ PetEntry.TABLE_NAME + " ( "
+ PetEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ PetEntry.COLUMN_PET_NAME + " TEXT NOT NULL, "
+ PetEntry.COLUMN_PET_BREED + " TEXT, "
+ PetEntry.COLUMN_PET_GENDER + " INTEGER NOT NULL, "
+ PetEntry.COLUMN_PET_WEIGHT + " INTEGER NOT NULL DEFAULT 0)";
db.execSQL(SQL_CREATE_PETS_TABLE);
答案 1 :(得分：0)
A。使用CREATE TABLE代替CREATE_TABLE
B。在语句
之间添加空格 更新您的PetDbHelper课程，如下所示：
package data;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import data.PetContract.PetEntry;
public class PetDbHelper extends SQLiteOpenHelper{
private static final String DATABASE_NAME="shelter.db";
private static final int DATABASE_VERSION=1;
public PetDbHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String SQL_CREATE_PETS_TABLE = "CREATE TABLE "
+ PetEntry.TABLE_NAME + " ( "
+ PetEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ PetEntry.COLUMN_PET_NAME + " TEXT NOT NULL, "
+ PetEntry.COLUMN_PET_BREED + " TEXT, "
+ PetEntry.COLUMN_PET_GENDER + " INTEGER NOT NULL, "
+ PetEntry.COLUMN_PET_WEIGHT + " INTEGER NOT NULL DEFAULT 0)";
db.execSQL(SQL_CREATE_PETS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
答案 2 :(得分：0)
您的代码中存在语法错误
04-17 14：27：56.514：E / SQLiteLog（1403）:( 1）接近＆＃34; CREATE_TABLEpets＆＃34;： 语法错误
SQL CREATE TABLE 语句语法：
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
....
);
你写的：
CREATE_TABLEpets(_idINTEGER PRIMARY KEY AUTOINCREMENT,nameTEXT NOT NULL,breedTEXT,genderINTEGER NOT NULL,weightINTEGER NOT NULL DEFAULT 0);
正确添加空格并将CREATE_TABLE更改为CREATE TABLE
以下是Android文档的示例
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + FeedEntry.TABLE_NAME + " (" +
FeedEntry._ID + " INTEGER PRIMARY KEY," +
FeedEntry.COLUMN_NAME_TITLE + " TEXT," +
FeedEntry.COLUMN_NAME_SUBTITLE + " TEXT)";