Question

这是我的主要产品：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    lvProduct = (ListView) findViewById(R.id.listview_product);
    mDBHelper = new DatabaseHelper(this);

    //Check exists database
    File database = getApplicationContext().getDatabasePath(DatabaseHelper.DBNAME);
    if (false == database.exists()) {
        mDBHelper.getReadableDatabase();
        //Copy db
        if (copyDatabase(this)) {
            Toast.makeText(this, "Copy database success", LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "Copy data error", LENGTH_SHORT).show();
            return;
        }
    }
    //Get product list in db when db exists
    mProductList = mDBHelper.getListProduct();
    //Init adapter
    adapter = new ProductListAdapter(this, mProductList);
    //Set adapter for listview
    lvProduct.setAdapter(adapter);

    spinners = (Spinner) findViewById(R.id.spinnertype);
    final ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.type_arrays, R.layout.support_simple_spinner_dropdown_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
    spinners.setAdapter(adapter);
    spinners.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
            String[] dataArray = getResources().getStringArray(R.array.type_arrays);
            String type = dataArray[pos];
            Toast.makeText(getApplicationContext(), "Type Selected : " + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
        }
    });

}
private boolean copyDatabase(Context context) {
    try {

        InputStream inputStream = context.getAssets().open(DatabaseHelper.DBNAME);
        String outFileName = DatabaseHelper.DBLOCATION + DatabaseHelper.DBNAME;
        OutputStream outputStream = new FileOutputStream(outFileName);
        byte[] buff = new byte[1024];
        int length = 0;
        while ((length = inputStream.read(buff)) > 0) {
            outputStream.write(buff, 0, length);
        }
        outputStream.flush();
        outputStream.close();
        Log.w("MainProduct", "DB copied");
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}
}

这是我的databasehelper：

   public DatabaseHelper(Context context) {
    super(context, DBNAME, null, 1);
    this.mContext = context;
}

@Override
public void onCreate(SQLiteDatabase db) {
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}

public void openDatabase() {
    String dbPath = mContext.getDatabasePath(DBNAME).getPath();
    if (mDatabase != null && mDatabase.isOpen()) {
        return;
    }
    mDatabase = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READWRITE);
}

public void closeDatabase() {
    if (mDatabase != null) {
        mDatabase.close();
    }
}

public List<Product> getListProduct() {
    Product product = null;
    List<Product> productList = new ArrayList<>();
    openDatabase();
    Cursor cursor = mDatabase.rawQuery("SELECT * FROM Product", null);
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        product = new Product(cursor.getInt(0), cursor.getString(1), cursor.getDouble(2), cursor.getString(3));
        productList.add(product);
        cursor.moveToNext();
    }
    cursor.close();
    closeDatabase();
    return productList;
}

}

要过滤listview，我是否需要有额外的java类（过滤器列表适配器）或将某个代码添加到'OnItemSelectedListener'？请帮助我，这是帮助我完成项目的最后一件事。我需要编辑的代码。我的微调器字符串是一个数组，我的sqlite数据库中有'type'列，我的create语句是

CREATE TABLE“Product”（ID INTEGER NOT NULL，NAME TEXT，PRICE DECIMAL（10,3）DEFAULT（null），DESC TEXT，{{ 1}} TEXT，TYPE BLOB，PRIMARY KEY（IMAGE））

希望任何人都可以帮助我。提前谢谢。

如何基于微调器阵列过滤或整理listview？

0 个答案: