Android：如何从Fragment onCreateView()访问Activity的视图(使用findViewById)？

概述我有一个非常简单的项目,其中包含一个包含片段的Activity.只有你可能不熟悉的是我使用的是VideoEnabledWebView,这并不是那么复杂,而是我以前用过的东西.这只是一个自定义的webview.这是我的代码：AndroidManifest.xml中<?xmlversion="1.0"encoding="utf-8"?><!--Don'tforg

我有一个非常简单的项目,其中包含一个包含片段的Activity.只有你可能不熟悉的是我使用的是VideoEnabledWebView,这并不是那么复杂,而是我以前用过的东西.这只是一个自定义的webvIEw.

这是我的代码：

AndroIDManifest.xml中

<?xml version="1.0" enCoding="utf-8"?>

<!-- Don't forget the internet permission if you will be using the WebVIEw to load remote content --><uses-permission androID:name="androID.permission.INTERNET" /><application    androID:allowBackup="true"    androID:icon="@drawable/ic_launcher"    androID:label="@string/app_name"    androID:theme="@style/Apptheme"    androID:harDWareAccelerated="true" > <!-- Only works in API level 11+, and allows the HTML5 vIDeos to play in-line -->    <activity        androID:name="name.cpr.ExampleActivity"        androID:label="@string/app_name" >        <intent-filter>            <action androID:name="androID.intent.action.MAIN" />            <category androID:name="androID.intent.category.LAUNCHER" />        </intent-filter>    </activity></application>

ExampleActivity.java

import androID.app.Activity;import androID.os.Bundle;import androID.util.Log;import cpr.name.vIDeoenableDWebvIEw.R;public class ExampleActivity extends Activity{    @OverrIDe    protected voID onCreate(Bundle savedInstanceState)    {        Log.i("rai", "activity onCreate");        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_example);    }}

activity_example.xml

<relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"xmlns:tools="http://schemas.androID.com/tools"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"tools:context=".ExampleActivity"><!-- VIEw that will be hIDden when vIDeo goes fullscreen --><relativeLayout    androID:ID="@+ID/nonVIDeolayout"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent" >    <fragment androID:name="name.cpr.WebVIEwFragment"        androID:ID="@+ID/webVIEwFragment"        androID:layout_wIDth="match_parent"        androID:layout_height="match_parent" /></relativeLayout><!-- VIEw where the vIDeo will be shown when vIDeo goes fullscreen --><relativeLayout    androID:ID="@+ID/vIDeolayout"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent" ></relativeLayout>

WebVIEwFragment.java

package name.cpr;import androID.app.Activity;import androID.app.Fragment;import androID.os.Bundle;import androID.util.Log;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import cpr.name.vIDeoenableDWebvIEw.R;public class WebVIEwFragment extends Fragment {private VIDeoEnableDWebVIEw webVIEw;private VIDeoEnableDWebChromeClIEnt webChromeClIEnt;VIEw rootVIEw;public VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container, Bundle savedInstanceState) {    rootVIEw = inflater.inflate(R.layout.root, container, false);    webVIEw = (VIDeoEnableDWebVIEw) rootVIEw.findVIEwByID(R.ID.webVIEw);    Log.i("rai", "nonVIDeolayout = " + R.ID.nonVIDeolayout);    Log.i("rai", "vIDeolayout = " + R.ID.vIDeolayout);    VIEw nonVIDeolayout = rootVIEw.findVIEwByID(R.ID.nonVIDeolayout);    if(nonVIDeolayout == null){        Log.i("rai", "why is nonVIDeolayout null?");    }    VIEwGroup vIDeolayout = (VIEwGroup)     rootVIEw.findVIEwByID(R.ID.vIDeolayout);    if(vIDeolayout == null){        Log.i("rai", "why is vIDeolayout null?");    }    webChromeClIEnt = new VIDeoEnableDWebChromeClIEnt(nonVIDeolayout, vIDeolayout);    webVIEw.setWebChromeClIEnt(webChromeClIEnt);    webVIEw.loadUrl("http://m.youtube.com");    return rootVIEw;}}

的ROOT.xml

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"androID:orIEntation="vertical" androID:layout_wIDth="match_parent"androID:layout_height="match_parent"><TextVIEw    androID:layout_wIDth="100dp"    androID:layout_height="100dp"    androID:text="the fragment"/><name.cpr.VIDeoEnableDWebVIEw    androID:ID="@+ID/webVIEw"    androID:layout_wIDth="fill_parent"    androID:layout_height="fill_parent" /></linearLayout>

我只是无法访问我的Activity中的那两个相对布局,我一直得到null.

我尝试过的东西不起作用：

rootVIEw.findVIEwByID // rootVIEw是来自inflate的返回

getActivity().findVIEwByID

getVIEw().findVIEwByID

container.findVIEwByID

我也在我的碎片onCreate中试过这个：

context = getActivity().getApplicationContext();webVIEwFragmentID = context.getResources().getIDentifIEr(        "root", "layout", context.getPackagename());webVIEwID = context.getResources().getIDentifIEr("webVIEw", "ID",        context.getPackagename());nonVIDeolayoutID = context.getResources().getIDentifIEr("nonVIDeolayout", "ID", context.getPackagename());vIDeolayoutID = context.getResources().getIDentifIEr("vIDeolayout","ID", context.getPackagename());rootVIEw = inflater.inflate(webVIEwFragmentID, null);webVIEw = (VIDeoEnableDWebVIEw) rootVIEw.findVIEwByID(webVIEwID);VIEw nonVIDeolayout = getActivity().findVIEwByID(nonVIDeolayoutID);VIEwGroup vIDeolayout = (VIEwGroup) getActivity().findVIEwByID(vIDeolayoutID);webChromeClIEnt = new VIDeoEnableDWebChromeClIEnt(nonVIDeolayout, vIDeolayout);webVIEw.setWebChromeClIEnt(webChromeClIEnt);webVIEw.loadUrl("http://m.youtube.com");return rootVIEw;

解决方法:

您应该覆盖onActivityCreated并从该方法中的活动访问所需的视图,因为当在片段中运行onCreateVIEw时,活动尚未设置其布局,因此您无法访问其视图.

@OverrIDepublic voID onActivityCreated (Bundle savedInstanceState) {    VIEw nonVIDeolayout = getActivity().findVIEwByID(R.ID.nonVIDeolayout);    VIEwGroup vIDeolayout = (VIEwGroup) getActivity().findVIEwByID(R.ID.vIDeolayout);    ...}

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