我想使用庫在我的Cardview列表中插入一個教程。對於這個庫我需要給一個視圖(指向元素),但我的mRecyclerView.findViewHolderForItemId(mAdapter.getItemId(1)).itemView
總是返回null。爲什麼這會返回null?由於回收視圖尚未創建?創建Recyclerview後調用函數
我也嘗試用來替換:mRecyclerView.findViewHolderForItemId(mAdapter.getItemId(1)).itemView)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_players);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view_list_player);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);
// use a linear layout manager
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
// specify an adapter (see also next example)
mDataset = Data.bdd.get_list_players();
mAdapter = new CardsViewAdapter(mDataset);
mRecyclerView.setAdapter(mAdapter);
// Tutorial
new MaterialIntroView.Builder(this)
.enableDotAnimation(true)
.enableIcon(true)
.setFocusGravity(FocusGravity.CENTER)
.setFocusType(Focus.MINIMUM)
.setDelayMillis(500)
.enableFadeAnimation(true)
.setInfoText("Hi There! Click this card and see what happens.")
.setShape(ShapeType.RECTANGLE)
.setTarget(mRecyclerView.findViewHolderForItemId(mAdapter.getItemId(1)))
.show();
}
你能發佈您的代碼被返回空指針 – Rahul
@Rasi是的,對不起,我省略了最後兩行。它是最後一次返回null:setTarget()作爲視圖的參數 – filol