Question

以下是这种情况：我有一些冗长的非UI代码需要在ListActivity中运行，然后让这个ListActivity更新UI以包含这个冗长方法（列表）的结果。我需要一个ProgressDialog才能运行直到它完成，所以用户有一些反馈。

以下是代码：

public class SolutionListActivity extends ListActivity
{

    private String[] solutions;
    private String letters;
    private ProgressDialog dialog;
    private static Solver solver;


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

            //Get the selected letters from LettersActivity
        letters = getIntent().getStringExtra("letters");

        dialog = ProgressDialog.show(this, "Please Wait...",
                    "Searching Words...", true);



        new Thread()
        {
            @Override
            public void run()
            {
                if (solver == null) 
                {
                    solver = new Solver(SolutionListActivity.this);
                    solver.readDictionary(0);
                    solver.readDictionary(1);
                }
                solutions = solver.solve(letters);

                runOnUiThread(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        dialog.dismiss();
                        //Set up a UI List
                        setListAdapter(new ArrayAdapter<String>(SolutionListActivity.this, R.layout.list_item, solutions));

                        ListView lv = getListView();
                        lv.setTextFilterEnabled(true);


                    }
                });

            }
        }.start();

问题是我的ProgressDialog不会被忽视，我无法确定在solutions = solver.solve(letters);

中UI使用它之前是否会完成setListAdapter(new ArrayAdapter<String>(SolutionListActivity.this, R.layout.list_item, solutions));

你们的任何建议都会有所帮助。

谢谢你， Calum

Answer 1

你试过AsyncTask吗？它的构建完全是为了具有线程并且能够更新UI线程中的内容。

看看这里：http://developer.android.com/resources/articles/painless-threading.html

Android线程问题

1 个答案: