Question

我需要一个包含多个联系人详细信息的首选项屏幕所以我默认有一个按钮和“添加联系人”按钮来添加其他联系人。出于某种原因，它一切正常，但是当我再次访问设置时，新的首选项不会显示。

当我添加联系人时，所有首选项都会显示 - 并且可以输入数据。但当我退出并重新进入prefs时，一切都消失了。只显示联系人1。

public class SettingsActivity extends PreferenceActivity implements
        OnSharedPreferenceChangeListener {

public PreferenceScreen root;

@SuppressWarnings("deprecation")
public PreferenceScreen createPreferenceHierarchy() {

    PreferenceCategory userDetails = new PreferenceCategory(this);
    userDetails.setTitle("User Details");
    userDetails.setKey("userdetails");
    root.addPreference(userDetails);

    EditTextPreference userName = new EditTextPreference(this);
    userName.setTitle("User Name");
    userName.setSummary("Please enter your full name");
    userName.setDialogTitle("Please enter your name");
    userName.setKey("userName");
    userDetails.addPreference(userName);

    EditTextPreference contactCount = new EditTextPreference(this);
    contactCount.setTitle("Count");
    contactCount.setEnabled(false);
    contactCount.setKey("contactcount");
    userDetails.addPreference(contactCount);

    PreferenceCategory contact1 = new PreferenceCategory(this);
    contact1.setTitle("Emergency Contact 1");
    contact1.setKey("contact1");
    contact1.setSummary("Add emergency contact details");
    root.addPreference(contact1);

    EditTextPreference contactName1 = new EditTextPreference(this);
    contactName1.setTitle("Name");
    contactName1.setSummary("Emergency Contact Name");
    contactName1.setDialogTitle("Please enter the name");
    contactName1.setKey("contactname1");

    contact1.addPreference(contactName1);

    ListView v = getListView();
    Button button = new Button(this);
    button.setText("Add Contact");
    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            int count = Integer.parseInt(root.getPreferenceManager()
                    .getSharedPreferences().getString("count", "1"));
            int nextCount = count + 1;

            EditTextPreference contactName = new EditTextPreference(
                    SettingsActivity.this);
            contactName.setKey("contactname" + nextCount);
            contactName.setTitle("Email ID");
            contactName.setSummary("Emergency Contact's Name");

            PreferenceCategory preferenceCategory = new PreferenceCategory(
                    SettingsActivity.this);
            preferenceCategory.setKey("contact" + nextCount);
            preferenceCategory.setTitle("Emergency Contact" + nextCount);
            preferenceCategory.setSummary("Add emergency contact details");

            root.addPreference(preferenceCategory);
            root.addPreference(contactName);


            Editor editor = root.getPreferenceManager()
                    .getSharedPreferences().edit();
            editor.putString("count", Integer.toString(++count));
            editor.commit();
        }
    });
    v.addFooterView(button);
    return root;
}

    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.root = getPreferenceManager().createPreferenceScreen(
                    SettingsActivity.this);
        this.setPreferenceScreen(createPreferenceHierarchy());
    }
}

基本上，按钮点击添加的新联系人下次不会显示。我需要将它保存在某个地方吗？我做错了什么？

Answer 1

是的，这正好反映了你在做什么。这是首选项活动，这意味着它是所有首选项的持久值。这并不意味着保存所有（数量）偏好。

每次重新访问此活动时，它都只会调用onCreate方法。从onCreate你的控件将转到createPreferenceHierarchy（）。在此方法中，您只设置一个EditText首选项。仅表示一个Edittext首选项。单击“添加联系人”按钮时，只会将新的edittext首选项添加到首选项屏幕。因此，您的活动正在重新启动，并且根据您的createPreferenceHierarchy（）方法的定义，只应将一个EditText首选项添加到您的首选项屏幕。

如果你想要所有的首选项而不是onCreate从sharedPreference获取Count。并且多次使用Preference Catagory添加EditText Preference。

更改ur方法因此，对于demo，请参阅此内容。

public class SettingsActivity extends PreferenceActivity implements
        OnSharedPreferenceChangeListener {

public PreferenceScreen root;

@SuppressWarnings("deprecation")
public PreferenceScreen createPreferenceHierarchy() {

    PreferenceCategory userDetails = new PreferenceCategory(this);
    userDetails.setTitle("User Details");
    userDetails.setKey("userdetails");
    root.addPreference(userDetails);

    EditTextPreference userName = new EditTextPreference(this);
    userName.setTitle("User Name");
    userName.setSummary("Please enter your full name");
    userName.setDialogTitle("Please enter your name");
    userName.setKey("userName");
    userDetails.addPreference(userName);

    EditTextPreference contactCount = new EditTextPreference(this);
    contactCount.setTitle("Count");
    contactCount.setEnabled(false);
    contactCount.setKey("contactcount");
    userDetails.addPreference(contactCount);

    PreferenceCategory contact1 = new PreferenceCategory(this);
    contact1.setTitle("Emergency Contact 1");
    contact1.setKey("contact1");
    contact1.setSummary("Add emergency contact details");
    root.addPreference(contact1);

    EditTextPreference contactName1 = new EditTextPreference(this);
    contactName1.setTitle("Name");
    contactName1.setSummary("Emergency Contact Name");
    contactName1.setDialogTitle("Please enter the name");
    contactName1.setKey("contactname1");

    contact1.addPreference(contactName1);

    ListView v = getListView();
    Button button = new Button(this);
    button.setText("Add Contact");
    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            int count = Integer.parseInt(root.getPreferenceManager()
                    .getSharedPreferences().getString("count", "1"));
            int nextCount = count + 1;

            EditTextPreference contactName = new EditTextPreference(
                    SettingsActivity.this);
            contactName.setKey("contactname" + nextCount);
            contactName.setTitle("Email ID");
            contactName.setSummary("Emergency Contact's Name");

            PreferenceCategory preferenceCategory = new PreferenceCategory(
                    SettingsActivity.this);
            preferenceCategory.setKey("contact" + nextCount);
            preferenceCategory.setTitle("Emergency Contact" + nextCount);
            preferenceCategory.setSummary("Add emergency contact details");

            root.addPreference(preferenceCategory);
            root.addPreference(contactName);


            Editor editor = root.getPreferenceManager()
                    .getSharedPreferences().edit();
            editor.putString("count", Integer.toString(++count));
            editor.commit();
        }
    });
    v.addFooterView(button);
    return root;
}

    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.root = getPreferenceManager().createPreferenceScreen(
                    SettingsActivity.this);
        SharedPreferences preferences=PreferenceManager.getDefaultSharedPreferences(getBaseContext());
        int Count = Integer.parseInt(preferences.getString("count", "1"));
        for (int i =0;i< Count ;i++){
        this.setPreferenceScreen(createPreferenceHierarchy());
        }
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
            String key) {
        // TODO Auto-generated method stub

    }
}

按钮点击添加首选项 - Android

1 个答案: