这是错误消息：java.lang.IllegalArgumentException：列“ voiceID”不存在
它表示该列不存在，但在create语句中。该活动甚至无法打开。我正在使用Android Studio和Sqlite制作带有数据库的应用程序。我已经上课了。这是数据库助手。
public class ContactDBHelper extends SQLiteOpenHelper {
public static final String TAG = ContactDBHelper.class.getSimpleName();
private static final String DATABASE_NAME = "cally.db";
private static final int DATABASE_VERSION = 1;
public ContactDBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String SQL_CREATE_STATEMENT = "CREATE TABLE " + ContactEntry.TABLE_NAME + " ("
+ ContactEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ ContactEntry.COLUMN_VOICE_ID + " TEXT NOT NULL, "
+ ContactEntry.COLUMN_VIDEO_ID + " TEXT NOT NULL, "
+ ContactEntry.COLUMN_CONTACT_NAME + " TEXT NOT NULL, "
+ ContactEntry.COLUMN_CONTACT_NUMBER + " TEXT NOT NULL, "
+ ContactEntry.COLUMN_CONTACT_IMAGE + " TEXT NOT NULL);";
db.execSQL(SQL_CREATE_STATEMENT);
Log.v(TAG,"Table Created");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
这是“合同”类别：
public final class Contract {
private Contract(){}
public static final String CONTENT_AUTHORITY = "com.example.android.cally";
public static final Uri BASE_CONTENT_URI = Uri.parse("content://" + CONTENT_AUTHORITY);
public static final String PATH_CONTACTS = "Contacts";
public static final class ContactEntry implements BaseColumns{
public static final String CONTENT_LIST_TYPE =
ContentResolver.CURSOR_DIR_BASE_TYPE + "/" + CONTENT_AUTHORITY + "/" + PATH_CONTACTS;
public static final String CONTENT_ITEM_TYPE =
ContentResolver.CURSOR_ITEM_BASE_TYPE + "/" + CONTENT_AUTHORITY + "/" + PATH_CONTACTS;
public static final Uri CONTENT_URI = Uri.withAppendedPath(BASE_CONTENT_URI, PATH_CONTACTS);
public final static String TABLE_NAME = "Contacts";
public final static String _ID = BaseColumns._ID;
public final static String COLUMN_VOICE_ID = "voiceID";
public final static String COLUMN_VIDEO_ID = "videoID";
public final static String COLUMN_CONTACT_NAME = "name";
public final static String COLUMN_CONTACT_NUMBER = "number";
public final static String COLUMN_CONTACT_IMAGE = "imagePath";
}
}
这是Main Activity，插入数据是要插入虚拟数据。
public class MainActivity extends AppCompatActivity {
FloatingActionButton FAB;
private String TAG = "MainActivity";
private ContactDBHelper mDBHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FAB = (FloatingActionButton)findViewById(R.id.floatingActionButton);
FAB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,NewContact.class);
startActivity(i);
}
});
mDBHelper = new ContactDBHelper(this);
}
private void insertContact() {
// Gets the database in write mode
SQLiteDatabase db = mDBHelper.getWritableDatabase();
Random rand = new Random();
int randomNum = rand.nextInt((999 - 1) + 1) + 1;
ContentValues values = new ContentValues();
values.put(ContactEntry._ID,randomNum);
values.put(ContactEntry.COLUMN_CONTACT_NAME, "Bob");
values.put(ContactEntry.COLUMN_CONTACT_NUMBER, "1234567");
values.put(ContactEntry.COLUMN_CONTACT_IMAGE,"bob.jpg");
values.put(ContactEntry.COLUMN_VOICE_ID, "4472");
values.put(ContactEntry.COLUMN_VIDEO_ID, "4471");
// long newRowId = db.insert(ContactEntry.TABLE_NAME, null, values);
Uri newUri = getContentResolver().insert(ContactEntry.CONTENT_URI, values);
displayInfo();
}
@Override
protected void onStart() {
super.onStart();
displayInfo();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// User clicked on a menu option in the app bar overflow menu
switch (item.getItemId()) {
case R.id.action_insert_dummy_data:
insertContact();
displayInfo();
return true;
}
return super.onOptionsItemSelected(item);
}
private void displayInfo() {
// Define a projection that specifies which columns from the database
// you will actually use after this query.
String[] projection = {
ContactEntry._ID,
ContactEntry.COLUMN_CONTACT_NAME,
ContactEntry.COLUMN_CONTACT_NUMBER,
ContactEntry.COLUMN_CONTACT_IMAGE};
// Perform a query on the provider using the ContentResolver.
Cursor cursor = getContentResolver().query(
ContactEntry.CONTENT_URI, // The content URI of the words table
projection, // The columns to return for each row
null, // Selection criteria
null, // Selection criteria
null); // The sort order for the returned rows
TextView displayView = (TextView) findViewById(R.id.tableCount);
try {
// Create a header in the Text View that looks like this:
//
//
// In the while loop below, iterate through the rows of the cursor and display
// the information from each column in this order.
displayView.setText("The contacts table contains " + cursor.getCount() + " contacts.\n\n");
displayView.append(ContactEntry._ID + " - " +
ContactEntry.COLUMN_CONTACT_NAME + " - " +
ContactEntry.COLUMN_CONTACT_NUMBER + " - " +
ContactEntry.COLUMN_CONTACT_IMAGE + "\n" +
ContactEntry.COLUMN_VOICE_ID + " - " +
ContactEntry.COLUMN_VIDEO_ID + "\n");
// Figure out the index of each column
int idColumnIndex = cursor.getColumnIndex(ContactEntry._ID);
int nameColumnIndex = cursor.getColumnIndex(ContactEntry.COLUMN_CONTACT_NAME);
int numberColumnIndex = cursor.getColumnIndex(ContactEntry.COLUMN_CONTACT_NUMBER);
int imageColumnIndex = cursor.getColumnIndex(ContactEntry.COLUMN_CONTACT_IMAGE);
int voiceIDColumnIndex = cursor.getColumnIndexOrThrow(ContactEntry.COLUMN_VOICE_ID);
int videoIDColumnIndex = cursor.getColumnIndex(ContactEntry.COLUMN_VIDEO_ID);
// Iterate through all the returned rows in the cursor
while (cursor.moveToNext()) {
// Use that index to extract the String or Int value of the word
// at the current row the cursor is on.
int currentID = cursor.getInt(idColumnIndex);
String currentName = cursor.getString(nameColumnIndex);
String currentNumber = cursor.getString(numberColumnIndex);
String currentImage = cursor.getString(imageColumnIndex);
String currentVoiceID = cursor.getString(voiceIDColumnIndex);
String currentVideoID = cursor.getString(videoIDColumnIndex);
// Display the values from each column of the current row in the cursor in the TextView
displayView.append(("\n" + currentID + " - " +
currentName + " - " +
currentNumber + " - " +
currentImage + " - " +
currentVoiceID + " - " +
currentVideoID));
}
} finally {
// Always close the cursor when you're done reading from it. This releases all its
// resources and makes it invalid.
cursor.close();
}
}
}
答案 0 :(得分：1)
使用此
String[] projection = {
ContactEntry._ID,
ContactEntry.COLUMN_VOICE_ID,
ContactEntry.COLUMN_VIDEO_ID,
ContactEntry.COLUMN_CONTACT_NAME,
ContactEntry.COLUMN_CONTACT_NUMBER,
ContactEntry.COLUMN_CONTACT_IMAGE};