如何在 Android 中调用 getContentResolver()？
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How can getContentResolver() be called in Android?
提问by Android_programmer_office
I want to know the context in which getContentResolver()is called?
我想知道getContentResolver()被调用的上下文？
I have a scenario like this:
I have an activity A that calls a method myFunc()of class B which is not an activity.
So, in class B I have to use getContentResolver(). I directly called getContentResolver(). It was showing error. Then I called myFunc(Acitivy act)from the activity and called act.getContentResolver()which solved my problem. Is this the only way to call getContentResolver(), which means it can be used in context with activity or can be used alone.
我有一个这样的场景：
我有一个活动 A，它调用了一个myFunc()不是活动的 B 类方法。
因此，在 BI 类中必须使用getContentResolver(). 我直接打了电话getContentResolver()。它显示错误。然后我myFunc(Acitivy act)从活动中调用并调用 act.getContentResolver()它解决了我的问题。这是调用 的唯一方法吗getContentResolver()，这意味着它可以在活动的上下文中使用，也可以单独使用。
回答by Nikolay Ivanov
getContentResolver()is method of class android.content.Context, so to call it you definitely need an instance
of Context ( Activity or Service for example).
getContentResolver()是 class 的方法android.content.Context，因此要调用它，您肯定需要一个 Context 实例（例如 Activity 或 Service）。
回答by Ankit Jain
You can use like this:
你可以这样使用：
getApplicationContext().getContentResolver()
with the proper context.
有适当的上下文。
回答by Azurespot
The getContentResolver()method is also used when you query a Contact, using a Cursorobject. I have used getContentResolver()to query the Android phone Contactsapp, looking for contact info from a person's phone number, to include in my app. The different elements in a query (as shown below) represent what kind of contact details you want, and if they should be ordered, etc. Here is another example.
getContentResolver()当您Contact使用Cursor对象查询 a 时，也会使用该方法。我曾经getContentResolver()查询 Android 手机Contacts应用程序，从一个人的电话号码中查找联系信息，以包含在我的应用程序中。查询中的不同元素（如下所示）表示您想要什么样的联系方式，以及是否应该订购等。这是另一个示例。
From the Content Provider Basicspage from Android docs.
来自 Android 文档的Content Provider Basics页面。
// Queries the user dictionary and returns results
mCursor = getContentResolver().query(
UserDictionary.Words.CONTENT_URI, // The content URI of the words table
mProjection, // The columns to return for each row
mSelectionClause // Selection criteria
mSelectionArgs, // Selection criteria
mSortOrder); // The sort order for the returned rows
回答by E235
import android.content.Context;
import android.content.ContentResolver;
context = (Context)this;
ContentResolver result = (ContentResolver)context.getContentResolver();
回答by Humxa Moghal
This one worked for me getBaseContext();
这个对我有用 getBaseContext();
回答by Rangana Fernando
//create activity object to get activity from Activity class for use to content resolver
private final Activity ActivityObj;
//create constructor with ActivityObj to get activity from Activity class
public RecyclerViewAdapterClass(Activity activityObj) {
this.ActivityObj = activityObj;
}
ActivityObj.getContentResolver(),.....,.....,null);
回答by Hamed Jaliliani
Access contentResolver in Kotlin , inside activities, Object classes &... :
访问 Kotlin 中的 contentResolver 、内部活动、对象类 &... ：
Application().contentResolver
回答by Amul Bhatia
A solution would be to get the ContentResolverfrom the context
一个解决方案是ContentResolver从context
ContentResolver contentResolver = getContext().getContentResolver();
Link to the documentation : ContentResolver
文档链接：ContentResolver
