动态创建CheckBoxPreferences

发布于 2024-11-14 09:02:53 字数 269 浏览 3 评论 0原文

我目前正在使用网络服务中的内容动态构建带有复选框的行列表。但是，此 ListView 几乎需要完成 PreferenceActivity 所能完成的工作。

我不知道行数，因为内容是动态的，因此我无法在 XML 中创建每个 CheckBoxPreference。如何构建一个 PreferenceActivity 来动态显示带有 CheckBoxPreference 的未知行数？

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桜花祭 2024-11-21 09:02:53

我想你正在寻找这样的东西：

public class MyPreferenceActivity extends PreferenceActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.my_preference_activity);

        //fetch the item where you wish to insert the CheckBoxPreference, in this case a PreferenceCategory with key "targetCategory"
        PreferenceCategory targetCategory = (PreferenceCategory)findPreference("targetCategory");

        //create one check box for each setting you need
        CheckBoxPreference checkBoxPreference = new CheckBoxPreference(this);
        //make sure each key is unique  
        checkBoxPreference.setKey("keyName");
        checkBoxPreference.setChecked(true);

        targetCategory.addPreference(checkBoxPreference);
    }
}

I think you're looking for something like this:

public class MyPreferenceActivity extends PreferenceActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.my_preference_activity);

        //fetch the item where you wish to insert the CheckBoxPreference, in this case a PreferenceCategory with key "targetCategory"
        PreferenceCategory targetCategory = (PreferenceCategory)findPreference("targetCategory");

        //create one check box for each setting you need
        CheckBoxPreference checkBoxPreference = new CheckBoxPreference(this);
        //make sure each key is unique  
        checkBoxPreference.setKey("keyName");
        checkBoxPreference.setChecked(true);

        targetCategory.addPreference(checkBoxPreference);
    }
}

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不顾 2024-11-21 09:02:53

好吧@Jodes，实际上你们俩都是对的，但是正确的方法是使用 列表首选项。

我会使用完整的程序化方法，根据我的经验，它更容易保持一致；要么通过代码创建整个 XML 布局，要么通过 XML，但是混合两者可能会很奇怪，并且您无法更改通过 XML 设置的所有内容...

onCreate(){
    this.setPreferenceScreen(createPreferenceHierarchy());
}

public PreferenceScreen createPreferenceHierarchy(){
    PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);

    // category 1 created programmatically
    PreferenceCategory cat1 = new PreferenceCategory(this);
    cat1.setTitle("title");
    root.addPreference(cat1);

    ListPreference list1 = new ListPreference(this);
    list1.setTitle(getResources().getString(R.string.some_string_title));
    list1.setSummary(getResources().getString(R.string.some_string_text));      
    list1.setDialogTitle(getResources().getString(R.string.some_string_pick_title));
    list1.setKey("your_key");

    CharSequence[] entries  = calendars.getCalenders(); //or anything else that returns the right data
    list1.setEntries(entries);
    int length              = entries.length;
    CharSequence[] values   = new CharSequence[length];
    for (int i=0; i<length; i++){
        CharSequence val = ""+i+1+"";
        values[i] =  val;
    }
    list1.setEntryValues(values);

    cat1.addPreference(list1);

    return root;
}//end method

但是，使用这种方法您将遇到平台的限制，即没有多重选择 < code>ListPreference，您可能想要实现其他东西。

我找到了这个解决方案，效果很好。不过，您必须阅读注释才能找到有关如何调试代码的线索......

Well @Jodes, actually both of you are right, but the correct way of doing this would be using a ListPreference.

I would use a entire programmatic approach, from my experience it's easier to be consistent; either create an entire XML layout via code, or via XML, but mixing the 2 can be weird and you cannot alter everything set via XML...

onCreate(){
    this.setPreferenceScreen(createPreferenceHierarchy());
}

public PreferenceScreen createPreferenceHierarchy(){
    PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);

    // category 1 created programmatically
    PreferenceCategory cat1 = new PreferenceCategory(this);
    cat1.setTitle("title");
    root.addPreference(cat1);

    ListPreference list1 = new ListPreference(this);
    list1.setTitle(getResources().getString(R.string.some_string_title));
    list1.setSummary(getResources().getString(R.string.some_string_text));      
    list1.setDialogTitle(getResources().getString(R.string.some_string_pick_title));
    list1.setKey("your_key");

    CharSequence[] entries  = calendars.getCalenders(); //or anything else that returns the right data
    list1.setEntries(entries);
    int length              = entries.length;
    CharSequence[] values   = new CharSequence[length];
    for (int i=0; i<length; i++){
        CharSequence val = ""+i+1+"";
        values[i] =  val;
    }
    list1.setEntryValues(values);

    cat1.addPreference(list1);

    return root;
}//end method

However, using this approach you will run into the platform's limitations of not having a multiple select ListPreference, and you'll probably want to implement something else.

I found this solution, which works great. You'll have to read the comments to find clues about how to debug the code though...

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