android - 标签栏 : on click go to home screen

Question

我正在使用标签栏。我在每个选项卡中有超过三个屏幕，当我按下所选选项卡的选项卡按钮时，它应该转到该选项卡的第一个屏幕，但它没有。
这是我的 tabar 代码。

public class TabUi extends TabActivity {
    private static final String TAG_DEALS = "DEAL";
    private static final String TAG_SEARCH = "SEARCH";
    private static final String TAG_BOOKMARKS = "ALERTS";
    private static final String TAG_FRIENDS = "BUZZ";
    private static final String TAG_MORE = "MORE";
    /*
     * private static final String TAG_DEALS = ""; private static final String
     * TAG_SEARCH = ""; private static final String TAG_BOOKMARKS = ""; private
     * static final String TAG_FRIENDS = ""; private static final String
     * TAG_MORE ="";
     */
    protected LocationManager locationManager;
    Location location;
    private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in
                                                                        // Meters
    private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in
                                                                    // Milliseconds

    // private TabHost host = null;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Resources res = getResources();

        TabHost tabHost = getTabHost();

        TabHost.TabSpec spec;

        Intent intent;

        intent = new Intent().setClass(this, DealsActivityGroup.class);
        spec = tabHost.newTabSpec(TAG_DEALS)
                .setIndicator(TAG_DEALS, res.getDrawable(R.drawable.deal_icon))
                .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, SearchActivityGroup.class);
        spec = tabHost
                .newTabSpec(TAG_SEARCH)
                .setIndicator(TAG_SEARCH,
                        res.getDrawable(R.drawable.search_icon))
                .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, BookmarksActivityGroup.class);
        spec = tabHost
                .newTabSpec(TAG_BOOKMARKS)
                .setIndicator(TAG_BOOKMARKS,
                        res.getDrawable(R.drawable.bookmark_icon))
                .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, FriendsActivityGroup.class);
        spec = tabHost
                .newTabSpec(TAG_FRIENDS)
                .setIndicator(TAG_FRIENDS,
                        res.getDrawable(R.drawable.friend_icon))
                .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, MoreActivity.class);
        spec = tabHost.newTabSpec(TAG_MORE)
                .setIndicator(TAG_MORE, res.getDrawable(R.drawable.more_icon))
                .setContent(intent);
        tabHost.addTab(spec);
    }

    /*@Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

    }*/

}

这是标签 Activity 组的代码:

public class DealsActivityGroup extends ActivityGroup {

    public static DealsActivityGroup group;
    private ArrayList<View> history;
    private ProgressDialog pDialog;
    String Url;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.history = new ArrayList<View>();
        group = this;

    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        // new DealsFirst().execute();
        View view = getLocalActivityManager().startActivity(
                "Dealsfirstactivity",
                new Intent(DealsActivityGroup.this, Dealsfirstactivity.class)
                        .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
                .getDecorView();

        replaceView(view);
    }

    public void replaceView(View v) {
        // Adds the old one to history
        history.add(v);
        v.setFocusable(true);
        v.setFocusableInTouchMode(true);
        v.requestFocus();

        // Changes this Groups View to the new View.
        setContentView(v);
    }

    public void back() {

        System.out.println("History size: " + history.size());
        if (history.size() > 1) {
            history.remove(history.size() - 1);
            View v = history.get(history.size() - 1);
            System.out.println("If size: " + history.size());
            v.setFocusable(true);
            v.setFocusableInTouchMode(true);
            v.requestFocus();
            System.out.println("View : " + v);
            setContentView(v);

        } else
            // System.out.println("History size: "+ history.size());
            this.finish();
    }

    @Override
    public void onBackPressed() {
        DealsActivityGroup.group.back();
        return;
    }

    public class DealsFirst extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // pDialog = new ProgressDialog(Dealsfirstactivity.this);
            // pDialog.setMessage("Please wait!..");
            // pDialog.setIndeterminate(false);
            // pDialog.setCancelable(true);
            // pDialog.show();
        }

        protected String doInBackground(String... args) {
            if (StorageManager.Instance().GetdealscategoryData() == null) {
                ServiceHelper.Instance().Dealscategorylist();
            }
            return null;

        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String result) {
            // dismiss the dialog once done
            super.onPostExecute(result);

            if (StorageManager.Instance().GetdealscategoryData() != null
                    && StorageManager.Instance().GetdealscategoryData().size() > 0) {
                new Dealslistfirst().execute();

            }
        }

    }

        public class Dealslistfirst extends AsyncTask<String, String, String> {

            /**
             * Before starting background thread Show Progress Dialog
             * */
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                pDialog = new ProgressDialog(getDialogContext());
                pDialog.setMessage("Please wait!..");
                pDialog.setIndeterminate(false);
                pDialog.setCancelable(true);
                pDialog.show();
            }

            protected String doInBackground(String... args) {

                ServiceHelper.Instance().dealsforyoulist(Url);
                return null;

            }

            /**
             * After completing background task Dismiss the progress dialog
             * **/
            protected void onPostExecute(String result) {
                // dismiss the dialog once done
                super.onPostExecute(result);

                if (StorageManager.Instance().GetdealsData() != null
                        && StorageManager.Instance().GetdealsData().size() > 0) {

                    // runOnUiThread(action)

                } else if (StorageManager.Instance().GetdealsData() == null) {

                }
                if (pDialog.isShowing()) {
                    pDialog.dismiss();
                }

                View view = getLocalActivityManager().startActivity(
                        "Dealsfirstactivity",
                        new Intent(DealsActivityGroup.this,
                                Dealsfirstactivity.class)
                                .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
                        .getDecorView();

                replaceView(view);
            }

        }

        private Context getDialogContext() {
            Context context;
            if (getParent() != null)
                context = getParent();
            else
                context = this;
            return context;
        }
    }

Answer 1

TabActivity 可以识别您何时切换标签(从一个标签切换到另一个标签)，但无法识别您是否选择了当前标签。

I am working with tab bar. I have more then three screens in each tab and when I press the tab button of selected tab, it should go to first screen of that tab, but it doesn't go.

为此，您需要在 TabActivity 中实现 onTouchListener。

请引用此链接以解决您的问题。 get notified when current tab is selected