Question

发送的数据未保存在数据库中，我不知道我错过了哪些代码添加。应用程序的流程是将所谓的已发送数据保存到数据库中，数据库将其显示在其中一个选项卡的列表视图中。这是发送按钮的代码和数据库的填充字段：

btnSend.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                String phoneNo = editTextRecipient.getText().toString();
                String message = editTextNewMessage.getText().toString(); 
                Log.d(phoneNo, message);
                saveState(phoneNo, message);
                boolean split = false;

                final Toast toast = Toast.makeText(getBaseContext(), 
                         "Your message " + "\"" + message + "\"" + " is sent to " +"\""+ phoneNo+"\"", 
                          Toast.LENGTH_SHORT);

                Runnable showToastRunnable = new Runnable() {
                  public void run() {
                      dialog.cancel();
                      toast.show();
                  }
              };

                if (phoneNo.length()>0 && message.length()>0)  {
                    showProgress();
                    if (count == 0) {
                          handler.postDelayed(showToastRunnable, 0);
                      }
                      else if (count == 1) {
                          handler.postDelayed(showToastRunnable, 15000);
                      }
                      else if (count == 2) {
                          handler.postDelayed(showToastRunnable, 30000);
                      }
                      else if (count == 3) {
                          handler.postDelayed(showToastRunnable, 60000);
                      }
                }

                   // sendSMS(phoneNo, message, split); */
                else
                    Toast.makeText(getBaseContext(), 
                        "Please enter both phone number and message.", 
                        Toast.LENGTH_SHORT).show();
            }
        });        
    }

     private void populateFields() {
        if (mRowId!=null) {
            Cursor message=mDbHelper.fetchNote(mRowId);
            startManagingCursor(message);
            editTextRecipient.setText(message.getString(message.getColumnIndexOrThrow(MessagesDBAdapter.KEY_RECIPIENT)));
            editTextNewMessage.setText(message.getString(message.getColumnIndexOrThrow(MessagesDBAdapter.KEY_MESSAGE)));
        }
     }

     private void saveState(String phoneNo, String message) {
         Log.i(phoneNo, message);

        if (mRowId==null) {
            mDbHelper.createNote(phoneNo, message);
        }
     }

这是数据库的代码：

public class MessagesDBAdapter {

    public static final String KEY_RECIPIENT = "recipient";
    public static final String KEY_MESSAGE = "body";
    public static final String KEY_ROWID = "_id";

    private static final String TAG = "NotesDbAdapter";
    private DatabaseHelper mDbHelper;
    private SQLiteDatabase mDb;


     //Database creation sql statement

    private static final String DATABASE_CREATE =
        "create table notes (_id integer primary key autoincrement, "
        + "title text not null, body text not null);";

    private static final String DATABASE_NAME = "data";
    private static final String DATABASE_TABLE = "messages";
    private static final int DATABASE_VERSION = 2;

    private final Context mCtx;

    private static class DatabaseHelper extends SQLiteOpenHelper {

        DatabaseHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {

            db.execSQL(DATABASE_CREATE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                    + newVersion + ", which will destroy all old data");
            db.execSQL("DROP TABLE IF EXISTS notes");
            onCreate(db);
        }
    }

    /**
     * Constructor - takes the context to allow the database to be
     * opened/created
     * 
     * @param ctx the Context within which to work
     */
    public MessagesDBAdapter(Context ctx) {
        this.mCtx = ctx;
    }

    public MessagesDBAdapter open() throws SQLException {
        mDbHelper = new DatabaseHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }

    public void close() {
        mDbHelper.close();
    }

    public long createNote(String phoneNo, String message) {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_RECIPIENT, phoneNo);
        initialValues.put(KEY_MESSAGE, message);

        open();

        return mDb.insert(DATABASE_TABLE, null, initialValues);
    }

    public boolean deleteNote(long rowId) {

        return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
    }

    public Cursor fetchAllNotes() {

        return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_RECIPIENT,
                KEY_MESSAGE}, null, null, null, null, null);
    }

    public Cursor fetchNote(long rowId) throws SQLException {

        Cursor mCursor =

            mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
                    KEY_RECIPIENT, KEY_MESSAGE}, KEY_ROWID + "=" + rowId, null,
                    null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor;

    }

    public boolean updateNote(long rowId, String phoneNo, String message) {
        ContentValues args = new ContentValues();
        args.put(KEY_RECIPIENT, phoneNo);
        args.put(KEY_MESSAGE, message);

        return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
    }
}

Answer 1

    public long insertData(String TableName, String[] ColumnNames,
                String[] Values) {

            String myPath = this.DB_PATH + DB_NAME;

            this.dbHandler();

            ContentValues dataObj = new ContentValues();
            for (int i = 0; i < ColumnNames.length; i++) {
                dataObj.put(ColumnNames[i], Values[i]);
            }
            return (this.db.insert(TableName, null, dataObj));

        }



public void dbHandler() {
        String myPath = this.DB_PATH + DB_NAME;
        if (this.db != null) {
            if (this.cursor != null) {

                try {
                    // OPEN
                    this.cursor.close();
                } catch (Exception e) {

                }

            }
            this.db.close();
            this.db = SQLiteDatabase.openDatabase(myPath, null,
                    SQLiteDatabase.OPEN_READWRITE);
        } else {
            this.db = SQLiteDatabase.openDatabase(myPath, null,
                    SQLiteDatabase.OPEN_READWRITE);

        }
    }

Android：将数据插入数据库

1 个答案: