ProgressDialog未在TabActivity中显示

Question

我有一个带有一些选项卡的TabActivity，用于用户输入。当用户完成输入并按下保存按钮时，我将继续进行数据保存。这是通过在每个活动中调用方法startDataTravershal()来完成的。我想在按下按钮时显示一个progressDialog，并在数据保存完成后将其关闭。然而，无论我做什么，progressDialog都没有显示出来。

我的代码：

    public class HandHoldingTabUI extends TabActivity {

    TabHost TabHostWindow;
    TabSpec TabEntry;
    TabSpec TabRectification;
    TabSpec TabG26;
    TabSpec TabU26;
    TabSpec TabG27;
    TabSpec TabBudget;
    TabSpec TabBDC;
    TabSpec TabTradeL;
    TabSpec TabIncomeC;
    TabSpec TabPCC;
    TabSpec TabTAR;
    TabSpec TabPNTA;
    TabSpec TabPaperless;
    TabSpec TabOthers;

    Button btnSaveData = null;

    ProgressDialog progressDialog = null;

    public static HandHoldingTabUI context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.handholding_tab_ui);
        context=this;
        UserDataHelper helper = new UserDataHelper(HandHoldingTabUI.this);
        helper.deleteData("delete from "+UserDataHelper.tableMentorSurveyData);
        helper.close();
        init();
    }

    private void init() {
        btnSaveData = (Button) findViewById(R.id.btnSaveData);
        btnSaveData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                progressDialog = ProgressDialog.show(HandHoldingTabUI.this, "",
                        "Loading. Please wait...");
                HandHoldingTabUI.this.runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        saveData();
                        progressDialog.dismiss();
                    }
                });

            }
        });
        TabHostWindow = (TabHost)findViewById(android.R.id.tabhost);

        createTab(TabEntry,"Entry","Entry", Entry.class);  //Entry
        createTab(TabRectification,"Rectification","Rectification", Rectification.class);  // Rectification
        createTab(TabG26,"Generation of form 26","Generation of form 26", G26.class);  //Generation of form 26
        createTab(TabU26,"Uploading of form 26","Uploading of form 26", U26.class);  //Uploading of form 26
        createTab(TabG27,"Generation of form 27","Generation of form 27", G27.class);  //Generation of form 27
        createTab(TabBudget,"Budget (Form 36)","Budget (Form 36)", Budget.class);  //Budget (Form 36)
        createTab(TabBDC,"Birth and Death Certificate","Birth and Death Certificate", BDC.class);  //Birth and Death Certificate
        createTab(TabTradeL,"Trade license","Trade license", TradeL.class);  //Trade license
        createTab(TabIncomeC,"Income Certificate","Income Certificate", IncomeC.class);  //Income Certificate
        createTab(TabPCC,"Provisional Caste Certificate","Provisional Caste Certificate", PCC.class);  //Provisional Caste Certificate
        createTab(TabTAR,"Tax Assessment Register","Tax Assessment Register", TAR.class);  //Tax Assessment Register
        createTab(TabPNTA,"Preparation of Non-tax Assessment","Preparation of Non-tax Assessment", PNTA.class);  //Preparation of Non-tax Assessment
        createTab(TabPaperless,"Paperless","Paperless", PaperLess.class);  //Paperless
        createTab(TabOthers,"Others","Others", Others.class);  //Others

        setUpCommonData();

    }

    private void setUpCommonData() {
        SharedPreferences prefs = getSharedPreferences("Preferences", Context.MODE_PRIVATE);
        HandholdingCommonData.gpCode = getIntent().getStringExtra("gpCode");
        HandholdingCommonData.userId = prefs.getString("userCode",null);
        HandholdingCommonData.userGroup = prefs.getString("userGroup",null);
        HandholdingCommonData.userChekInTime = prefs.getString("checkInTime",null);
        HandholdingCommonData.userFileId = HandholdingCommonData.userId + "_"+HandholdingCommonData.userChekInTime;
    }

    private void createTab(TabSpec TabMenu,String TabName,String TabIndicator,Class TabActivity){

        TabMenu = TabHostWindow.newTabSpec(TabName);
        TabMenu.setIndicator(TabIndicator);
        TabMenu.setContent(new Intent(this,TabActivity));
        TabHostWindow.addTab(TabMenu);
    }

    private void saveData() {

        UserDataHelper helper = new UserDataHelper(HandHoldingTabUI.this);
        helper.deleteData("delete from "+UserDataHelper.tableMentorSurveyData);
        helper.close();

        for(int i = 0; i<getTabHost().getTabWidget().getTabCount(); i++) {
            getTabHost().setCurrentTab(i);
            Activity myActivity = this.getCurrentActivity();
            if(myActivity instanceof Entry) {
                Entry obj = (Entry) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof BDC) {
                BDC obj = (BDC) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof Budget) {
                Budget obj = (Budget) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof G26) {
                G26 obj = (G26) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof G27) {
                G27 obj = (G27) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof IncomeC) {
                IncomeC obj = (IncomeC) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof Others) {
                Others obj = (Others) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof PaperLess) {
                PaperLess obj = (PaperLess) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof PCC) {
                PCC obj = (PCC) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof PNTA) {
                PNTA obj = (PNTA) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof Rectification) {
                Rectification obj = (Rectification) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof TAR) {
                TAR obj = (TAR) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof TradeL) {
                TradeL obj = (TradeL) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
            if(myActivity instanceof U26) {
                U26 obj = (U26) myActivity;
                obj.category = "Handholding Support";
                obj.startDataTravershal();
            }
        }
        proceedToShowDraft();
    }

    private void proceedToShowDraft() {
        Intent intent = new Intent();
        intent.setClass(HandHoldingTabUI.this,DraftUi.class);
        intent.putExtra("gpCode",HandholdingCommonData.gpCode);
        intent.putExtra("userGroup",HandholdingCommonData.userGroup);
        intent.putExtra("userId",HandholdingCommonData.userId);
        intent.putExtra("userFileId",HandholdingCommonData.userFileId);
        startActivity(intent);
        HandHoldingTabUI.this.finish();
    }
}

我尝试过这些解决办法，但它们没有帮助：

Progress Dialog in Tab Layout in android

Show a progress dialog in android tab layout

android how to put progressdialog in TabActivity

我非常感谢在这个问题上提供任何帮助。

谢谢，致以最诚挚的问候。

编辑:根据评论，我试图这样做:-

AsyncTask task = new AsyncTask() {
                @Override
                protected Object doInBackground(Object[] params) {
                    progressDialog = ProgressDialog.show(HandHoldingTabUI.this, "",
                            "Loading. Please wait...");
                    saveData();
                    return null;
                }

                @Override
                protected void onPostExecute(Object o) {
                    progressDialog.dismiss();
                    proceedToShowDraft();
                }
            };

这是在按钮的onClick()上写的。但现在，当我点击按钮时，什么都不会发生。

Answer 1

请尝试更改您的onClick()方法如下：

@Override
public void onClick(View v) {
    progressDialog = ProgressDialog.show(HandHoldingTabUI.this, "",
            "Loading. Please wait...");
    new Thread(new Runnable() {

        @Override
        public void run() {
            saveData_1();
            HandHoldingTabUI.this.runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    saveData_2();
                    progressDialog.dismiss();
                }
            });
        }
    }).start();
}

...

private void saveData_1() {
    UserDataHelper helper = new UserDataHelper(HandHoldingTabUI.this);
    helper.deleteData("delete from "+UserDataHelper.tableMentorSurveyData);
    helper.close();
}

private void saveData_2() {
    for(int i = 0; i<getTabHost().getTabWidget().getTabCount(); i++) {
        getTabHost().setCurrentTab(i);
        Activity myActivity = this.getCurrentActivity();
        if(myActivity instanceof Entry) {
            Entry obj = (Entry) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof BDC) {
            BDC obj = (BDC) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof Budget) {
            Budget obj = (Budget) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof G26) {
            G26 obj = (G26) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof G27) {
            G27 obj = (G27) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof IncomeC) {
            IncomeC obj = (IncomeC) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof Others) {
            Others obj = (Others) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof PaperLess) {
            PaperLess obj = (PaperLess) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof PCC) {
            PCC obj = (PCC) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof PNTA) {
            PNTA obj = (PNTA) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof Rectification) {
            Rectification obj = (Rectification) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof TAR) {
            TAR obj = (TAR) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof TradeL) {
            TradeL obj = (TradeL) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
        if(myActivity instanceof U26) {
            U26 obj = (U26) myActivity;
            obj.category = "Handholding Support";
            obj.startDataTravershal();
        }
    }
    proceedToShowDraft();
}

请注意，在执行后台线程时，您应该考虑活动完成时应该发生的事情。