从PreferenceScreen转到DialogPreference

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问题描述

我的应用程序有一个设置菜单，它实际上是offormenceActivity. 当它创建时，如果未设置布尔值，我想转到对象，该方法设置为此.

我尝试用意图做它，但申请力关闭了这个错误msg:

E/AndroidRuntime(239): Android.Content.ActivityNotFoundException: 无法找到显式活动类 {com.xxxx/com.xxxx.xxxxpreference}; 你有没有宣布过这项活动您的androidmanifest.xml?

我该怎么办?可以将Dateverference添加到清单?

推荐答案

a DialogPreference在其自己的右侧不是Activity.它只是一个Preference，它在单击时显示Dialog.

问题是，没有显着的方式以编程方式单击A Preference.但是，由于您使用的是DialogPreference，您已经让您拥有自己的子类.因此，我们可以通过将以下方法添加到您的DialogPreference:

的子类来解决我们的问题

//Expose the protected onClick method
void show() {
    onClick();
}

然后在PreferencesActivity中的onCreate()中，您将有类似的东西来从XML文件加载偏好:

// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences);

之后，您可以放置一些代码:

booleanProp = true; //set this to the value of the property you're checking     

if (! booleanProp) {
    //Find the Preference via its android:key
    //MyDialogPreference is your subclasss of DialogPreference
    MyDialogPreference dp = (MyDialogPreference)getPreferenceScreen().findPreference("dialog_preference");  
    dp.show();
}

这是一点黑客，因为曝光protected方法是理想的，但它确实工作了.

另一个选项是用PrefenceActivity替换Dialog，其中包含您希望维护的所有选项，然后您可以通过Intent启动它，但我假设您有一个充分的原因希望使用特定布局自己的自定义Dialog.如果您确实想要第二个PreferenceActivity，您可以将其添加到您的首选项XML文件中，如下所示:

<PreferenceScreen
        android:title="@string/title_of_preference"
        android:summary="@string/summary_of_preference">
    <intent android:action="your.action.goes.HERE"/>
</PreferenceScreen>

其他推荐答案

要使用意图启动活动，活动必须在Android清单中.只需添加一条线:

<activity android:name=".path.to.MyActivity"/>

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问题描述

My application has a setting menu which is actually a PreferenceActivity. When it's created, if a boolean value is not set I want to go to the DialogPreference which sets that.

I tried doing it with an intent but the application force closed with this error msg:

E/AndroidRuntime( 239): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.xxxx/com.xxxx.xxxxPreference}; have you declared this activity in your AndroidManifest.xml?

How should I do this? It's ok to add that DialogPreference to the manifest?

推荐答案

A DialogPreference isn't an Activity in its own right. It's just a Preference which displays a Dialog when clicked.

The problem is that there's no obvious way programmatically click a Preference. However, since you're using DialogPreference you've already got you own subclass of it. So we can solve our problem by adding the following method to your subclass of DialogPreference:

//Expose the protected onClick method
void show() {
    onClick();
}

Then in the onCreate() of your PreferencesActivity you'll have something like this to load the preferences from your XML file:

// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences);

After that you can put some code like this:

booleanProp = true; //set this to the value of the property you're checking     

if (! booleanProp) {
    //Find the Preference via its android:key
    //MyDialogPreference is your subclasss of DialogPreference
    MyDialogPreference dp = (MyDialogPreference)getPreferenceScreen().findPreference("dialog_preference");  
    dp.show();
}

This is a bit of hack, as exposing protected methods isn't ideal, but it does work.

Another option would be to replace the Dialog with a PrefenceActivity which contained all the options you wish to maintain and then you could launch it via an Intent, but I'm assuming there's a good reason that you want your own custom Dialog with a specific layout. If you do want a second PreferenceActivity you can add it to your preferences XML file as follows:

<PreferenceScreen
        android:title="@string/title_of_preference"
        android:summary="@string/summary_of_preference">
    <intent android:action="your.action.goes.HERE"/>
</PreferenceScreen>

其他推荐答案

To start an activity with an Intent, the activity must be in the Android manifest. Just add a line like:

<activity android:name=".path.to.MyActivity"/>

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