Question

我在使用Android中的ListViews，ArrayAdapters和Fragments时遇到一些困难，其中包含标记的.xml文件会导致ClassNotFoundException。我正在运行Android 4.0.3 FWIW。这是我的主要活动类的样子：

public class MarketActivity extends FragmentActivity implements OnClickListener {

private ListView marketListView;

private MarketAdapter adapter;

@Override
protected void onStart() {
    super.onStart();
    setContentView(R.layout.market);
   marketListView = (ListView) findViewById(R.id.market_list_view);
   updateView();
}

private void updateView() {
    BfMarket market = ((MarketController) getController()).getMarket();
    BfRunner runners = market.getRunners();

    if (adapter == null) {
        adapter = new MarketAdapter(this, R.layout.market_row, runners.getRunners());
    }
    if (marketListView != null && runners != null) {
        marketListView.setAdapter(adapter);
        marketListView.setTextFilterEnabled(true);
        adapter.setRunners(runners.getRunners());
        adapter.notifyDataSetChanged();
    }

MarketActivity的布局文件（R.layout.market）包含一个像这样的ListView：

<ListView
    android:id="@+id/market_list_view"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:cacheColorHint="@android:color/transparent" >
</ListView>

MarketAdapter类是一个简单的ArrayAdapter，如下所示：

public class MarketAdapter extends ArrayAdapter<Runner> {

private static final String LOG_TAG = "MarketAdapter";

private ArrayList<Runner> runners;
private BfMarket market;

public MarketAdapter(Context context, int textViewResourceId, ArrayList<Runner> runners) {
    super(context, textViewResourceId, runners);
    this.runners = runners;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater) getSystemService(
                Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.market_row, parent, false);
    }
    MarketRunner runner = (MarketRunner) runners.get(position);

代码在以下方面失败：

v = vi.inflate(R.layout.market_row, parent, false);

market_row有以下标记（我认为这会引起所有麻烦）：

<fragment class="com.my.app.DummyFragment"
        android:id="@+id/embedded"
        android:layout_width="0px" android:layout_height="wrap_content"
        android:layout_weight="1" />

我的DummyFragment非常简单：

public class DummyFragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment_dummy, container, false);
}

}

我已经尝试了几个故障排除方法：

确保我的MarketActivity引用了正确的支持API。这是我在MarketActivity类顶部的导入：

import android.support.v4.app.FragmentActivity;

我的项目的libs文件夹中有android-support-v4.jar，它也在项目的类路径中。我觉得兼容包很难读入我在market_row.xml中声明的标签。要么找不到与fragment标签关联的类，要么我使用的是不正确的LayoutInflater？所有的建议都非常受欢迎。

谢谢，

肖恩

java.lang.RuntimeException: Unable to start activity ComponentInfo{}: android.view.InflateException: Binary XML file line #51: Error inflating class fragment
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1777)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1793)
   at android.app.ActivityThread.access$1500(ActivityThread.java:123)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:123)
   at android.app.ActivityThread.main(ActivityThread.java:3848)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:507)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
   at dalvik.system.NativeStart.main(Native Method)

 Caused by: android.view.InflateException: Binary XML file line #51: Error inflating class fragment
   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:581)
   at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
   at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:211)
   at android.app.Activity.setContentView(Activity.java:1657)
   at com.test.base.activities.TabbedStoreActivity.onCreate(TabbedStoreActivity.java:46)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1731)

Answer 1

整篇文章：

View v = convertView;
if (v == null) {
    LayoutInflater vi = (LayoutInflater) getSystemService(
            Context.LAYOUT_INFLATER_SERVICE);
    v = vi.inflate(R.layout.market_row, parent, false);
}

过度。您在创建新的ArrayAdapter时已经设置了项目布局。它会记住它并将完成创建项目的所有工作，并且只在必要时才会这样做。

看here。

Android - ListViews，ArrrayAdapters，Fragments和ClassNotFoundExceptions

1 个答案: