Question

我正在开发一个项目，我正在使用Realm数据库，现在我正在尝试从数据库中获取值，它工作正常3-4次然后代码崩溃。错误消息如下

E / AndroidRuntime：致命异常：主要处理：in.mumbaitravellers.mtleaders，PID：22340 java.lang.ArrayIndexOutOfBoundsException：rowIndex＆gt;可用行：3＆gt; 3 at io.realm.internal.TableView.nativeGetSourceRowIndex（Native Method） at io.realm.internal.TableView.getSourceRowIndex（TableView.java:161）在io.realm.RealmResults.get（RealmResults.java:114） at in.mumbaitravellers.mtleaders.adapters.ExpenseAdapter.onBindViewHolder（ExpenseAdapter.java:55）在android.support.v7.widget.RecyclerView $ Adapter.onBindViewHolder（RecyclerView.java:5471）在android.support.v7.widget.RecyclerView $ Adapter.bindViewHolder（RecyclerView.java:5504）在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:4741）在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:4617）在android.support.v7.widget.LinearLayoutManager $ LayoutState.next（LinearLayoutManager.java:1994）在android.support.v7.widget.LinearLayoutManager.layoutChunk（LinearLayoutManager.java:1390）在android.support.v7.widget.LinearLayoutManager.fill（LinearLayoutManager.java:1353）在android.support.v7.widget.LinearLayoutManager.onLayoutChildren（LinearLayoutManager.java:574）在android.support.v7.widget.RecyclerView.dispatchLayoutStep2（RecyclerView.java:3028）在android.support.v7.widget.RecyclerView.dispatchLayout（RecyclerView.java:2906）在android.support.v7.widget.RecyclerView.onLayout（RecyclerView.java:3283）在android.view.View.layout（View.java:16646）在android.view.ViewGroup.layout（ViewGroup.java:5440）在android.support.design.widget.CoordinatorLayout.layoutChild（CoordinatorLayout.java:1037）在android.support.design.widget.CoordinatorLayout.onLayoutChild（CoordinatorLayout.java:747）在android.support.design.widget.ViewOffsetBehavior.onLayoutChild（ViewOffsetBehavior.java:42）在android.support.design.widget.AppBarLayout $ ScrollingViewBehavior.onLayoutChild（AppBarLayout.java:1156）在android.support.design.widget.CoordinatorLayout.onLayout（CoordinatorLayout.java:760）在android.view.View.layout（View.java:16646）在android.view.ViewGroup.layout（ViewGroup.java:5440）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:336）在android.widget.FrameLayout.onLayout（FrameLayout.java:273）在android.view.View.layout（View.java:16646）在android.view.ViewGroup.layout（ViewGroup.java:5440）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1743）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1586）在android.widget.LinearLayout.onLayout（LinearLayout.java:1495）在android.view.View.layout（View.java:16646）在android.view.ViewGroup.layout（ViewGroup.java:5440）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:336）在android.widget.FrameLayout.onLayout（FrameLayout.java:273）在android.view.View.layout（View.java:16646）在android.view.ViewGroup.layout（ViewGroup.java:5440）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1743）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1586）在android.widget.LinearLayout.onLayout（LinearLayout.java:1495）在android.view.View.layout（View.java:16646）在android.view.ViewGroup.layout（ViewGroup.java:5440）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:336）在android.widget.FrameLayout.onLayout（FrameLayout.java:273）在com.android.internal.policy.PhoneWindow $ DecorView.onLayout（PhoneWindow.java:2678）在android.view.View.layout（View.java:16646）在android.view.ViewGroup.layout（ViewGroup.java:5440）在android.view.ViewRootImpl.performLayout（ViewRootImpl.java:2183）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1943）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1119）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6060）在android.view.Choreographer $ CallbackRecord.run（Choreographer.java:858）在android.view.Choreographer.doCallbacks（Choreographer.java:670）在android.view.Choreographer.doFrame（Choreographer.java:606）在android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreog W / art：暂停所有线程：9.933ms

代码段如下：

public class ExpenseAdapter extends RealmRecyclerViewAdapater<Expense> {

final Context context;
private Realm realm;
private LayoutInflater inflater;

public ExpenseAdapter(Context context) {
    this.context = context;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    // inflate a new card view
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.expense_recycler_view, parent, false);
    // view.setOnCreateContextMenuListener(this);
    return new CardViewHolder(view);
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, final int position) {

    realm = RealmController.getInstance().getRealm();

    final Expense expense = getItem(position);
    final Tour tour = new Tour();
    final CardViewHolder holder = (CardViewHolder) viewHolder;
    String s = "";

    RealmResults<Tour> r = realm.where(Tour.class).findAll();
    realm.beginTransaction();
    s = r.get(position).getEventId();
    realm.commitTransaction();


    holder.textExpense.setText(expense.getAmount() + " E: " + expense.getEventId());
    holder.textDescription.setText(expense.getDescription() + " T: " + s);

    holder.card.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View content = inflater.inflate(R.layout.activity_add_new_expense, null);
            final EditText editAmount = (EditText) content.findViewById(R.id.edtxt_expense);
            final EditText editDescription = (EditText) content.findViewById(R.id.edtxt_description);

            editAmount.setText(expense.getAmount());
            editDescription.setText(expense.getDescription());

            AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.setView(content)
                    .setTitle("Edit Event")
                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                            RealmResults<Expense> results = realm.where(Expense.class).findAll();

                            realm.beginTransaction();
                            results.get(position).setAmount(editAmount.getText().toString());
                            results.get(position).setDescription(editDescription.getText().toString());

                            realm.commitTransaction();

                            notifyDataSetChanged();
                        }
                    })
                    .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
            AlertDialog dialog = builder.create();
            dialog.show();
        }
    });

}

@Override
public int getItemCount() {
    if (getRealmAdapter() != null) {
        return getRealmAdapter().getCount();
    }
    return 0;
}

public static class CardViewHolder extends RecyclerView.ViewHolder {

    public CardView card;
    public TextView textExpense;
    public TextView textDescription;

    public CardViewHolder(View itemView) {
        // standard view holder pattern with Butterknife view injection
        super(itemView);

        card = (CardView) itemView.findViewById(R.id.card_expense);
        textExpense = (TextView) itemView.findViewById(R.id.text_amount);
        textDescription = (TextView) itemView.findViewById(R.id.text_description);
    }

}
}

提前致谢!!!

Answer 1

这就是原因：

RealmResults<Expense> results = realm.where(Expense.class).findAll();
realm.beginTransaction();
results.get(position).setAmount(editAmount.getText().toString());
results.get(position).setDescription(editDescription.getText().toString());
realm.commitTransaction();
notifyDataSetChanged(); // <--------- this causes the crash

问题：

1。）如果您在事务中操作结果集，那么您应该在事务中进行查询

realm.beginTransaction();
RealmResults<Expense> results = realm.where(Expense.class).findAll();

2。）你应该避免创建不必要的代理，你应该只获得一次元素。

Expense expense = results.get(position);
expense.setAmount(editAmount.getText().toString());
expense.setDescription(editDescription.getText().toString());

3。）自0.89.0以来（但最多3.0.0），RealmResults仅在下一个事件循环中更新，之后调用RealmChangeListener。这由RealmRecyclerViewAdapter自动管理，这意味着如果你进行UI线程本地提交（你不应该，但你可以），那么你应该不手动调用adapter.notifyDataSetChanged() ，您应该注册RealmChangeListener并从那里调用它（这由RealmRecyclerViewAdapter内部管理）。

基本上，删除行notifyDataSetChanged() 。

此外，我发现您有RealmController.getInstance()来电，我猜您使用this guide from AndroidHive作为您的Realm驱动的应用程序的基础。

该指南是过时的垃圾，我建议使用我的：

How to use Realm for Android like a champ, and how to tell if you're doing it wrong

连同相应的source example。

领域

1 个答案: