Android recyclerView數據綁定適配器數據

我正在使用Android Data Binding實施Recycler View及其各自的adapter。問題是，在我見過的所有教程，它們初始化適配的數據與CollectionView model的一類，像這樣：Android recyclerView數據綁定適配器數據

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> implements View.OnClickListener { 

private ArrayList<ViewModel> items; 

public RecyclerViewAdapter(ArrayList<ViewModel> items) { 
    this.items = items; 
} 

..... 
}

但我想傳遞給Recycler View數據是一個Collectionrecords從我database：

private ArrayList<Record> items;

我怎樣才能做到這一點？

在此先感謝！

編輯

li_item.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools"> 

<data> 
    <variable 
     name="report" 
     type="viewmodel.ReportVM"/> 
</data> 

.... 

<TextView 
     android:id="@+id/tv_report_name" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:textSize="18sp" 
     android:paddingBottom="6dp" 
     android:text="@{report.name}" 
     tools:text="Report 1" 
     /> 

....

ADAPTER

public class ReportRVAdapter extends RecyclerView.Adapter<ReportRVAdapter.ReportViewHolder> { 

private List<ReportDb> data; 


public ReportRVAdapter(final List<ReportDb> reportData) { 
    this.data = reportData; 
} 

@Override 
public ReportRVAdapter.ReportViewHolder onCreateViewHolder(final ViewGroup parent, final int viewType) { 
    View v = LayoutInflater.from(parent.getContext()) 
      .inflate(R.layout.li_item, parent, false); 
    return new ReportViewHolder(v); 
} 

@Override 
public void onBindViewHolder(final ReportViewHolder holder, final int position) { 
    ReportDb item = data.get(position); 

    holder.getBinding().setVariable(BR.name, item.getName()); 
    holder.getBinding().setVariable(BR.contractor, item.getContractor()); 

    //make binding happen immediately 
    holder.getBinding().executePendingBindings(); 
} 

@Override 
public int getItemCount() { 
    return data == null ? 0 : data.size(); 
} 


public class ReportViewHolder extends RecyclerView.ViewHolder { 
    private ViewDataBinding binding; 

    public ReportViewHolder(final View rowView) { 
     super(rowView); 

     binding = DataBindingUtil.bind(rowView); 
    } 

    public ViewDataBinding getBinding() { 
     return binding; 
    } 
} 
}

模型視圖

public class ReportVM extends BaseObservable { 

public String name; 
public String contractor; 

public ReportVM() { 
} 

@Bindable 
public String getName() { 
    return name; 
} 

public void setName(final String name) { 
    this.name = name; 
} 

@Bindable 
public String getContractor() { 
    return contractor; 
} 

public void setContractor(final String contractor) { 
    this.contractor = contractor; 
} 
}

來源

2016-11-11 IrApp

你怎麼從你的'記錄縮回數據'？ –

我對數據庫做了一個查詢 – IrApp

在'onBindViewHolder'內執行它並不高效，所以你應該預先從數據庫讀取數據到mdoel我認爲 –

您可以在RecyclerView中使用任何集合，它取決於您如何將值與View（TextView，ImageView）綁定在一起。例子： -

@Override 
    public void onBindViewHolder(ViewHolder holder, int position) { 
      // - get element from your dataset at this position 
      // - replace the contents of the view with that element 
      final String name = mDataset.get(position); 
      holder.txtHeader.setText(mDataset.get(position)); 
}

在上面的例子中

，這取決於你，如果你使用的地圖，那麼你需要使用密鑰來獲得價值。對於設置相同的get方法可以使用。

來源

2016-11-11 08:48:28

最後我沒有意識到，而不是：

holder.getBinding().setVariable(BR.name, item.getName()); 
holder.getBinding().setVariable(BR.contractor, item.getContractor()); 

//make binding happen immediately 
holder.getBinding().executePendingBindings();

我應該這樣寫：

holder.getBinding().setReport(new ReportVM(item));

和我的POJO：

private ReportDb report; 

public ReportVM(final ReportDb report) { 
    this.report = report; 
} 

public String getName() { 
    return report.getName(); 
} 

public String getContractor() { 
    return report.getContractor(); 
}

來源

2016-11-11 14:19:45 IrApp

Android recyclerView數據綁定適配器數據

回答

相關問題