加载数据后不显示列表，但关闭显示并显示列表时

Question

加载数据后不显示列表视图，但当屏幕显示关闭并打开列表时 displayed.don不知道是什么 happening.i 我正在使用小米小米 phone测试应用程序是否需要任何其他活动代码，请告诉我

import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.widget.ArrayAdapter;

public class FriendList extends ListActivity {

    String email;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Bundle bundle = getIntent().getExtras();
        email = bundle.getString("email");

        setContentView(R.layout.contacts_list);

        final List<Model> list = new ArrayList<Model>();

        /** This block is for getting the image url to download from the server **/
        final GetDataFromDB getvalues = new GetDataFromDB();

        final ProgressDialog dialog = ProgressDialog.show(FriendList.this,
               "", "Gettting values from DB", true);
        new    Thread   (new Runnable() {
            public void run() {
                String response = getvalues.getImageURLAndDesciptionFromDB(email);
                System.out.println("Response : " + response);


                if (!response.equalsIgnoreCase("")) {
                    if (!response.equalsIgnoreCase("error")) {

                        dismissDialog(dialog);
                        // Got the response, now split it to get the image Urls and description
                        String all[] = response.split("\|::endline::\|");
                        for(int k = 0; k < all.length; k++){
                            String urls_and_desc[] = all[k].split("\|::break::\|"); //  urls_and_desc[0] contains image url and [1] -> description
                            System.out.println("image url : " + urls_and_desc[2]);

                            list.add(get(urls_and_desc[1], "https://xxxx.xx/" + urls_and_desc[2]));


                        }
                    }

                } else {
                   dismissDialog(dialog);
                }
            }
        }).start();
        /*************************** GOT data from Server ********************************************/

        ArrayAdapter<Model> adapter = new MyCustomArrayAdapter(this, list);
        adapter.notifyDataSetChanged();
        setListAdapter(adapter);


    }

    public void dismissDialog(final ProgressDialog dialog){
        runOnUiThread(new Runnable() {
            public void run() {
                dialog.dismiss();
            }
        });
    }
    private Model get(String s, String url) {
        return new Model(s, url);
    }

}

Answer 1

您应该在从服务器获取数据后调用 ((ArrayAdapter<Model>)getListAdapter()).notifyDataSetChanged()：

new    Thread   (new Runnable() {
        public void run() {
            String response = getvalues.getImageURLAndDesciptionFromDB(email);
            System.out.println("Response : " + response);


            if (!response.equalsIgnoreCase("")) {
                if (!response.equalsIgnoreCase("error")) {

                    dismissDialog(dialog);
                    // Got the response, now split it to get the image Urls and description
                    String all[] = response.split("\|::endline::\|");
                    for(int k = 0; k < all.length; k++){
                        String urls_and_desc[] = all[k].split("\|::break::\|"); //  urls_and_desc[0] contains image url and [1] -> description
                        System.out.println("image url : " + urls_and_desc[2]);

                        list.add(get(urls_and_desc[1], "https://xxxx.xx/" + urls_and_desc[2]));
                    }
                   runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            ((ArrayAdapter<Model>)getListAdapter()).notifyDataSetChanged();//Notify ListView to update itself.
                        }
                   });
                }

            } else {
               dismissDialog(dialog);
            }
        }
    }).start();