4

我试图在我的片段中实现一个 Phonegap CordovaWebView，但它不起作用。

我的布局如下所示（cordovawebview.xml）：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent">

<org.apache.cordova.CordovaWebView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id = "@+id/mainView"/>

</FrameLayout>

在我的片段中onCreateView()，我尝试扩大布局：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.cordovawebview, container); // <--- the error occurs here!
    // CordovaWebView webView = (CordovaWebView)v.findViewById(R.id.mainView);

    return v;
}

也许有人有一些提示如何解决它。我总是得到那个错误：

10-25 15:52:02.839: ERROR/AndroidRuntime(2878): FATAL EXCEPTION: main
    android.view.InflateException: Binary XML file line #21: Error inflating class org.apache.cordova.CordovaWebView
    at android.view.LayoutInflater.createView(LayoutInflater.java:613)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
    at com.advantageframework.tabs.fragments.SampleFragmentA.onCreateView(SampleFragmentA.java:81)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:871)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:635)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1431)
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:420)
    at android.os.Handler.handleCallback(Handler.java:615)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4745)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Constructor.constructNative(Native Method)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
    at android.view.LayoutInflater.createView(LayoutInflater.java:587)
    ... 19 more
    Caused by: java.lang.NullPointerException
    at org.apache.cordova.CordovaWebView.loadConfiguration(CordovaWebView.java:643)
    at org.apache.cordova.CordovaWebView.<init>(CordovaWebView.java:131)
    ... 22 more
4

3 回答 3

7

我找到了答案。如果您查看您看到的 logcat，它会尝试将 Context 转换为 CordovaInterface。上下文是活动。那里失败了。您可能将 Fragment 设置为 CordovaInterface。这就是我所做的。您必须使 Activity 成为 CordovaInterface 并从 Activity 将事件（onMessage，...）转发到 Fragment。

这是我的活动（删除了一些内容以使其更简单）。我有一些非常接近这个的东西，效果很好。之后您仍然会遇到一些较小的问题，但这些问题很容易解决。

public class MyCordovaActivity extends SherlockFragmentActivity implements
        CordovaInterface {
    private final ExecutorService mThreadPool = Executors.newCachedThreadPool();
    private CordovaPlugin mActivityResultCallback;

    private CordovaFragment mFragment;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.nbu_web_activity);
        mFragment = new CordovaFragment();
        getSupportFragmentManager().beginTransaction()
                .add(R.id.fragment, mFragment)
                .commit();

        // TODO this value you could pass to the activity with a intent extra
        // or allow to do this through a seperate function, ...
        String url = "http://....";
        mFragment.loadUrl(url);
    }

    @Override
    protected void onNewIntent(final Intent intent) {
        super.onNewIntent(intent);
        NBUGapFragment fragment = getCordovaFragment();
        if (fragment != null && fragment.appView != null) {
            fragment.appView.onNewIntent(intent);
        }
    }

    @Override
    public void onBackPressed() {
        NBUGapFragment fragment = getCordovaFragment();
        if (fragment == null || !fragment.onBackPressed()) {
            super.onBackPressed();
        }
    }

    @Override
    public void cancelLoadUrl() {
        getCordovaFragment().cancelLoadUrl();
    }

    @Override
    public Activity getActivity() {
        return this;
    }

    @Override
    public Context getContext() {
        return this;
    }

    @Override
    public ExecutorService getThreadPool() {
        return mThreadPool;
    }

    @Override
    public Object onMessage(final String id, final Object data) {
        return getCordovaFragment().onMessage(id, data);
    }

    @Override
    public void setActivityResultCallback(final CordovaPlugin plugin) {
        mActivityResultCallback = plugin;
    }

    @Override
    public void startActivityForResult(final CordovaPlugin plugin, final Intent intent,
            final int requestCode) {
        mActivityResultCallback = plugin;
        startActivityForResult(intent, requestCode);
    }

    @Override
    protected void onActivityResult(final int requestCode, final int resultCode, final Intent intent) {
        if (mActivityResultCallback != null) {
            mActivityResultCallback.onActivityResult(requestCode, resultCode, intent);
        } else {
            super.onActivityResult(requestCode, resultCode, intent);
        }
    }

    private CordovaFragment getCordovaFragment() {
        // the CordovaFragment is the one implementing CordovaInterface
        return mFragment;
    }
}
于 2012-11-02T00:03:28.260 回答
2

CordovaWebView 假定 Inflater 的上下文（在本例中为主 Activity）实现了 CordovaInterface。没有接口通过inflater传递单独的对象（上下文和CordovaInterface对象），您应该创建代理上下文，其中包含两个对象和对每个对象的委托方法调用；

private class CordovaContext extends ContextWrapper implements CordovaInterface
{
    CordovaInterface ci;

    // Hold two objects. Method call to Context will be proxied by ContextWrapper, so only delegate CordovaInterface.
    // You should add/modify when method in CordovaInterface changed
    public CordovaContext(Context base, CordovaInterface ci) {
        super(base);
        this.ci = ci;
    }
    public void startActivityForResult(CordovaPlugin command,
            Intent intent, int requestCode) {
        ci.startActivityForResult(command, intent, requestCode);
    }
    public void setActivityResultCallback(CordovaPlugin plugin) {
        ci.setActivityResultCallback(plugin);
    }
    public Activity getActivity() {
        return ci.getActivity();
    }
    public Object onMessage(String id, Object data) {
        return ci.onMessage(id, data);
    }
    public ExecutorService getThreadPool() {
        return ci.getThreadPool();
    }

}

在 Fragment 中，创建使用此 Context 对象的充气机；

LayoutInflater localInflater = inflater.cloneInContext(new CordovaContext(getActivity(), this));
View v = localInflater.inflate(R.layout.cordovawebview, container, false);
于 2013-09-10T10:10:41.150 回答
0 
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.cordovawebview, container, false); // <--- add false parameter
    CordovaWebView webView = (CordovaWebView)v.findViewById(R.id.mainView);

    return v;
}
于 2013-08-08T15:15:55.843 回答