Android Phonegap和Fragments

我试图在我的片段中实现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My Fragment的onCreateView()中,我尝试给布局充气：

@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;
}

也许某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

解决方法:

我找到了答案.如果您查看logcat,您会看到它尝试将Context转换为CordovaInterface.上下文是活动.它失败了.您可能将Fragment设为CordovaInterface.这就是我做的.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(删除一些东西以使其更简单).我有一些非常接近这个非常好的东西.之后你仍然会遇到一些小问题,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;
    }
}