如何将对象动态分配到堆中

Question

可能的重复项：
如何超过方法代码的 65535 字节限制

我的堆中有超过 64kb 的数据，如何克服限制？

public class ProductList extends Activity {
    //Listview
    private ListView lv;
    // Listview Adapter
    ArrayAdapter<String> adapter;
    // Search EditText
    EditText inputSearch;
    // ArrayList for Listview
    ArrayList<HashMap<String, String>> productList;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_product_list);

        String as = System.getProperty("line.separator");

                ArrayList<String> products = new ArrayList<String>();
                products.add("Banana" +as+ "Its color is yellow.");
                products.add("Orange" +as+ "Orange is a sour fruit.");
                products.add("Onion" +as+ "Onion usually used on Pizza");
                products.add("Banana" +as+ "Its color is yellow.");
                products.add("Orange" +as+ "Orange is a sour fruit.");
                products.add("Onion" +as+ "Onion usually used on Pizza");
                products.add("Banana" +as+ "Its color is yellow.");
                products.add("Orange" +as+ "Orange is a sour fruit.");
                products.add("Onion" +as+ "Onion usually used on Pizza");
                products.add("Banana" +as+ "Its color is yellow.");
                products.add("Orange" +as+ "Orange is a sour fruit.");


        lv = (ListView) findViewById(R.id.list_view);
        inputSearch = (EditText) findViewById(R.id.inputSearch);
        // Adding items to listview
        adapter = new ArrayAdapter<String>(this, R.layout.list_item, R.id.p_list,   products);
        lv.setAdapter(adapter);
        /**
         * Enabling Search Filter
         * */
        inputSearch.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                // When user changed the Text
                ProductList.this.adapter.getFilter().filter(cs);
            }
            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                    int arg3) {
                // TODO Auto-generated method stub
            }
            @Override
            public void afterTextChanged(Editable arg0) {
                // TODO Auto-generated method stub
            }
        });

    }
}

这是问题的图像 https://dl.dropbox.com/u/15065300/problem-4.png

我是安卓新手，所以需要详细的建议。

Answer 1

Java 将方法的大小限制为 65535 字节。你可以做的是将onCreate方法分解为更小的方法，然后从onCreate中调用这些方法。

编辑：

您可以做的是创建一个单独的方法来填充您的列表。您需要在创建列表适配器之前调用它。

注意：不过，正如其他人所提到的，如果您像这样硬编码这么多值，这通常被认为是不好的做法。建议将其更新为从数据库查询，或从某种类型的文件（txt、xml）读取。

public class ProductList extends Activity 
{
    //Listview
    private ListView lv;
    // Listview Adapter
    ArrayAdapter<String> adapter;
    // Search EditText
    EditText inputSearch;
    ArrayList<String> products = new ArrayList<String>();
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_product_list);
        lv = (ListView) findViewById(R.id.list_view);
        inputSearch = (EditText) findViewById(R.id.inputSearch);
        // Adding items to listview
        initProductList();
        adapter = new ArrayAdapter<String>(this, R.layout.list_item, R.id.p_list, products);
        lv.setAdapter(adapter);
        /**
         * Enabling Search Filter
         * */
        inputSearch.addTextChangedListener(new TextWatcher() 
        {
            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                // When user changed the Text
                ProductList.this.adapter.getFilter().filter(cs);
            }
            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                    int arg3) {
                // TODO Auto-generated method stub
            }
            @Override
            public void afterTextChanged(Editable arg0) {
                // TODO Auto-generated method stub
            }
        });
    }
    private void initProductList()
    {
        String as = System.getProperty("line.separator"); 
        products.add("Banana" +as+ "Its color is yellow.");
        products.add("Orange" +as+ "Orange is a sour fruit.");
        products.add("Onion" +as+ "Onion usually used on Pizza");
        products.add("Banana" +as+ "Its color is yellow.");
        products.add("Orange" +as+ "Orange is a sour fruit.");
        products.add("Onion" +as+ "Onion usually used on Pizza");
        products.add("Banana" +as+ "Its color is yellow.");
        products.add("Orange" +as+ "Orange is a sour fruit.");
        products.add("Onion" +as+ "Onion usually used on Pizza");
        products.add("Banana" +as+ "Its color is yellow.");
        products.add("Orange" +as+ "Orange is a sour fruit.");
    }
}

Answer 2

你没有。您需要将数据存储在 SQLite 数据库中，或者从文件中读取数据。在单个方法中，您不能拥有超过 64kB 的代码，虽然将其拆分为多个方法可以工作，但这是一种糟糕的编码实践。

我强烈建议您将数据保存在SQLite数据库中。这是执行此操作的优秀教程。