动态将项目添加到FragmentGridPagerAdapter

Robin Eisenberg 发表于 Dev

罗宾·艾森伯格

我正在尝试显示具有4个条目的FragmentGridPagerAdapter，并且当视图滚动时，我想向适配器添加项目。

这是我的FragmentPagerAdapter：

public class MyPagerAdapter extends FragmentGridPagerAdapter {

private final Context _ctx;
private HashMap<Integer, Entry> _data;

public MyPagerAdapter(Context context, FragmentManager fm, HashMap<Integer, Entry> tidatals) {
    super(fm);
    _ctx = context;
    _data = data;
}

public void addEntry(Entry entry)
{
    _data.put(_data.size(), entry);
    this.notifyDataSetChanged();
}


@Override
public Fragment getFragment(int i, int i2) {

    CardFragment fragment = CardFragment.create("Card", _data.get(i).getPrettyText());
    fragment.setCardGravity(Gravity.BOTTOM);
    fragment.setExpansionEnabled(true);
    return fragment;
}

@Override
public int getRowCount() {
    return _data.size();
}

@Override
public int getColumnCount(int i) {
    return 1;
}

}

这就是我如何在“主要磨损活动”中将数据添加到适配器的方法：

//In onCreate: 
    _data = new HashMap<Integer, Entry>();
    _adapter = new TILPagerAdapter(this, getFragmentManager(), _data);
    _pager.setAdapter(_adapter);

//When I finally get my data:
...
// Do stuff, get datas in 'data' variable
MainWear.this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                 boolean firstData = _data.isEmpty();
                for(TILEntry entry : data.values())
                {
                    _adapter.addEntry(entry);
                }
                if(firstData){
                    _pager.setAdapter(_adapter);
                    switchViewToResults(); // Sets pager to visible
                }
            }
        });

当我将项目添加到适配器中并调用notifyDataSetChanged（）时，适配器会刷新正常，但是当我滚动到添加的页面时会崩溃。

这是堆栈跟踪：

E/InputEventReceiver﹕ Exception dispatching input event.
E/MessageQueue-JNI﹕ Exception in MessageQueue callback: handleReceiveCallback
E/MessageQueue-JNI﹕ java.lang.ArrayIndexOutOfBoundsException: length=4; index=4
            at android.support.wearable.view.GridViewPager.populate(GridViewPager.java:873)
            at android.support.wearable.view.GridViewPager.setCurrentItemInternal(GridViewPager.java:584)
            at android.support.wearable.view.GridViewPager.handlePointerUp(GridViewPager.java:1990)
            at android.support.wearable.view.GridViewPager.onTouchEvent(GridViewPager.java:1492)
            at android.view.View.dispatchTouchEvent(View.java:7846)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2209)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1944)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2085)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1532)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2468)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2033)
            at android.view.View.dispatchPointerEvent(View.java:8026)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3989)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3868)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3433)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3483)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3452)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3559)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3460)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3616)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3433)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3483)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3452)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3460)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3433)
            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5589)
            at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5569)
            at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5540)
            at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5669)
            at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
            at android.os.MessageQueue.nativePollOnce(Native Method)
            at android.os.MessageQueue.next(MessageQueue.java:138)
            at android.os.Looper.loop(Looper.java:123)
            at android.app.ActivityThread.main(ActivityThread.java:5026)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
            at dalvik.system.NativeStart.main(Native Method)
D/AndroidRuntime﹕ Shutting down VM
W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xadb04d70)
E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: til.wear.robineisenberg.til_wear, PID: 5808
    java.lang.ArrayIndexOutOfBoundsException: length=4; index=4
            at android.support.wearable.view.GridViewPager.populate(GridViewPager.java:873)
            at android.support.wearable.view.GridViewPager.setCurrentItemInternal(GridViewPager.java:584)
            at android.support.wearable.view.GridViewPager.handlePointerUp(GridViewPager.java:1990)
            at android.support.wearable.view.GridViewPager.onTouchEvent(GridViewPager.java:1492)
            at android.view.View.dispatchTouchEvent(View.java:7846)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2209)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1944)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2215)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1958)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2085)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1532)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2468)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2033)
            at android.view.View.dispatchPointerEvent(View.java:8026)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3989)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3868)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3433)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3483)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3452)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3559)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3460)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3616)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3433)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3483)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3452)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3460)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3433)
            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5589)
            at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5569)
            at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5540)
            at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5669)
            at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
            at android.os.MessageQueue.nativePollOnce(Native Method)
            at android.os.MessageQueue.next(MessageQueue.java:138)
            at android.os.Looper.loop(Looper.java:123)
            at android.app.ActivityThread.main(ActivityThread.java:5026)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
            at dalvik.system.NativeStart.main(Native Method)

我在调用getFragment时打印了_data大小，在Adapter中，当调用getFragment时_data.size（）的值正确为8。

在日志中，4是初始适配器大小的大小。之后，8是所需的大小。它不会在添加项目时崩溃，而只会在滚动显示卡至新项目时崩溃。我究竟做错了什么？

编辑：确实，这似乎是适配器的notifyDataSetChanged函数中的遗漏。我打开了一个带有Google的错误报告，如果您认为需要解决此问题，请给它加注星标：

https://code.google.com/p/android/issues/detail?id=73846&thanks=73846&ts=1405945122

马蒂阿什

873行GridViewPager.populate()是这样的：

    this.mRowScrollX[row] = computePageLeft(...);

mRowScroll设置适配器时，数组的长度看起来是固定的，而从启动getRowCount()时起不会更新notifyDataSetChanged()。确实，如果检查GridViewPager该类的其余部分，您会看到它仅在setAdapter()方法中分配：

    this.mExpectedRowCount = this.mAdapter.getRowCount();
    this.mRowScrollX = new int[this.mExpectedRowCount];

简而言之，我认为这是中的错误GridViewPager，setAdapter()只要您想更新行数或列数，都可以通过再次调用来解决。

本文收集自互联网，转载请注明来源。

如有侵权，请联系[email protected] 删除。

编辑于2021-02-11

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