Question

目前我的代码加载了TabWidget个标签。第一个标签指向免责声明页面，该页面还从编辑文本框中获取用户名并将其内部存储在手机上。我希望有一个if条件，检查用户名是否存储在手机上，如果是，则向用户显示与原始免责声明页面不同的“谢谢”页面。我相信我的代码不起作用，因为它在onCreate函数下并且没有刷新...

    public class TabWidgetActivity extends TabActivity {

    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Resources res = getResources(); // Resource object to get Drawables
    TabHost tabHost = getTabHost();  // The activity TabHost
    TabHost.TabSpec spec;  // Reusable TabSpec for each tab
    Intent intent;  // Reusable Intent for each tab


    // Create an Intent to launch an Activity for the tab (to be reused)

    String username = null;  
    String pulledUsername = getPreferences(MODE_PRIVATE).getString("username",username);

    // ******* MAIN PART I'M HAVING TROUBLE WITH ********************************

    if (pulledUsername != null){
    intent = new Intent().setClass(this, HomeActivity.class);
    }
    else {
    intent = new Intent().setClass(this, DisclaimerActivity.class);
    }

    // ^^^^^^^^^^^^^^^ MAIN PART I'M HAVING TROUBLE WITH ^^^^^^^^^^^^^^^^^^^^^^

    // Initialize a TabSpec for each tab and add it to the TabHost

    spec = tabHost.newTabSpec("home").setIndicator("Home",
                      res.getDrawable(R.drawable.ic_tab_home))
                  .setContent(intent);
    tabHost.addTab(spec);

    // Do the same for the other tabs

    intent = new Intent().setClass(this, ShowMapActivity.class);
    spec = tabHost.newTabSpec("map").setIndicator("Map",
                      res.getDrawable(R.drawable.ic_tab_map))
                  .setContent(intent);
    tabHost.addTab(spec);

    intent = new Intent().setClass(this, SurveyActivity.class);
    spec = tabHost.newTabSpec("survey").setIndicator("Survey",
                      res.getDrawable(R.drawable.ic_tab_web))
                  .setContent(intent);
    tabHost.addTab(spec);

    intent = new Intent().setClass(this, AnalysisActivity.class);
    spec = tabHost.newTabSpec("analysis").setIndicator("Analysis",
                      res.getDrawable(R.drawable.ic_tab_analysis))
                  .setContent(intent);
    tabHost.addTab(spec);

    tabHost.setCurrentTab(2);
     }
    }

Answer 1

你能更清楚“不工作”吗？

您是否在此活动的首选项中设置了用户名？如果没有，那么您应该使用getSharedPreferences()，因为首选项存储在每个活动的基础上。

在免责声明活动中编写用户名

  SharedPreferences settings = getSharedPreferences("com.blah.application", MODE_PRIVATE);
  SharedPreferences.Editor editor = settings.edit();
  editor.putString("username", username); 
  // Commit the edit!
  editor.apply();

在其他活动中提取用户名时：

pulledUsername = getSharedPreferences("com.blah.application", MODE_PRIVATE).getString("username",null)

如何使用if语句使TabWidget更改Intents

1 个答案: