android - 在选项卡之间传递 ArrayList

Question

我不是很清楚 Intent 对象以及如何使用它在 Activity 之间传递数据。在我的应用程序中，我有几个选项卡，我想在它们之间传递 ArrayList。这是我打算使用的示例代码，但我遗漏了主要 Activity 捕获 Intent 并将其传递给开始时的新 Activity 的部分:

1. myTabs.java ==> 这是我认为我需要添加一些代码以在 TabOne 和 TabTwo 之间传递数据的地方。现在它只是使用 TabActivity 示例的示例代码。

public class myTabs 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)
        intent = new Intent().setClass(this, TabPeopleActivity.class);
        // Initialize a TabSpec for each tab and add it to the TabHost
        spec = tabHost.newTabSpec("TabOne").setIndicator("TabOne",
                          res.getDrawable(R.drawable.ic_tab_one))
                      .setContent(intent);
        tabHost.addTab(spec);

        // Do the same for the other tabs
        intent = new Intent().setClass(this, TabTransactionActivity.class);
        spec = tabHost.newTabSpec("TabTwo").setIndicator("TabTwo",
                          res.getDrawable(R.drawable.ic_tab_two))
                      .setContent(intent);
        tabHost.addTab(spec);

        tabHost.setCurrentTab(0);
    }
}

2. TabOne.java ==> 我在 onStop 过程中添加了一段代码，用我想传递给 TabTwo 的数组填充 Intent 数据。虽然不确定这是正确的做法。

public class TabOne extends Activity {

    [...]
    private ArrayList<String> arrayPeople;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tabone);
        arrayPeople = new ArrayList<String>();

    [... here we modify arrayPeople ...]

    }

    /** Called when the activity looses focus **/
    @Override
    public void onStop(){
        Intent myIntent = new Intent();
        myIntent.putStringArrayListExtra("arrayPeople", arrayPeople);
        this.setIntent(myIntent);
    }
}

3. TabTwo.java ==> 在这里，我试图从应该在 Activity 启动时传递的 Intent 中获取 ArrayList。但是如何做到这一点呢？

public class TabTwo extends Activity {

    private ArrayList<String> arrayPeople;

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

        Intent myIntent = new Intent();
        myIntent = this.getIntent();
        arrayPeople = myIntent.getStringArrayListExtra("arrayPeople");
    }
}

感谢您的想法!

编辑:

好吧，我会简单点，这是项目的完整工作区:

http://www.lecompteestbon.com/Android.LCEB.zip

我想做的是 lecompteestbon 网站的离线版本，它允许人们在周末后在 friend 之间做账。

TabPeople = Add the list of friends
TabTransactions = List of expenses
TabTransaction = Add an expense
TabResult = Calculate the list of payments

让我知道如何完成这项工作:)

Answer 1

如何在 myTabs 对象中设置一个静态字段？

    public class myTabs extends TabActivity {
....
public static arrayPeople = new ArrayList<String>();
....

在 TabOne.java 上:

 @Override
    public void onStop(){
       myTabs.arrayPeople = arrayPeople;
    }

在 TabTwo.java 上:

arrayPeople =  myTabs.arrayPeople

有意义吗？