我正在研究設計我的應用程序以使用Android L並將其設計爲使用新的Material Design。使用RecyclerView示例不會編譯
我正在研究RecyclerView的示例https://developer.android.com/preview/material/ui-widgets.html,但該示例不能編譯。
下面是我的活動類
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String[] myDataset = new String[2];
myDataset[0] = "Hello";
myDataset[1] = "World";
setContentView(R.layout.activity_recylcer);
mRecyclerView = (RecyclerView)findViewById(R.id.recylcerView);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyAdapter(myDataset);
mRecyclerView.setAdapter(mAdapter);
}
下面是我MyAdapter類
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private String[] mDataset;
// Provide a reference to the type of views that you are using
// (custom viewholder)
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView mTextView;
public ViewHolder(TextView v) {
super(v);
mTextView = v;
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
@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
holder.mTextView.setText(mDataset[position]);
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return mDataset.length;
}
}
,我有這個問題,當我創建了ViewHolder實例的例子說,在變量傳遞v
這是一個View,但Android Studio正在說它需要一個TextView。
我假設我已經做了一些錯誤,因爲我想認爲Google的Android開發網站會有正確的代碼的例子,但我不明白我的生活可能有什麼錯誤。
感謝您提供的任何幫助。
這就是Android的網站說,它應該是,如果我改變的構造是視圖則mTextView不能被設置爲通過傳遞給構造函數的變量設置 – Boardy 2014-08-31 15:45:12
ViewHolder構造函數只是期望一個View,不一定是TextView。 正如Boldizsar建議的那樣,改變你的構造函數以接收一個View並將其轉換(因爲你知道它是一個TextView)。或者在調用ViewHolder的構造函數之前將v投射到TextView中。 – yigit 2014-09-03 03:27:08