【发布时间】：2016-01-02 03:00:19
【问题描述】：
所以我做了多个不同的 CardView Layout 并放到 RecyclerView 中，每个 cardview 都有自己的类来处理视图。然后我在 MainActivity 中有一个浮动操作按钮，我想将它用作我的程序的启动器，但我无法访问其中一个卡片视图中的计时。那么如何从 MainActivity 访问其中一个 CardView 中的视图（Chrono）？
我已经尝试过使用 mainactivity 中的 findviewbyid，但它总是返回 null，因为它可能还创建了 recyclerview。
感谢您的帮助。
谢谢
CustomAdapter.java
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private int[] mCardTypes;
public static final int TIME = 0;
public static final int MAP = 1;
public static final int COST = 2;
public static class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(View itemView) {
super(itemView);
}
}
public CustomAdapter(MainActivity main, int[] cardTypes) {
this.main = main;
mCardTypes = cardTypes;
}
public class ParkTimeViewHolder extends ViewHolder {
Chronometer mTotalTime;
Chronometer mRemainingTime;
public ParkTimeViewHolder(View itemView) {
super(itemView);
this.mTotalTime = (Chronometer) itemView.findViewById(R.id.chrono_total);
this.mRemainingTime = (Chronometer) itemView.findViewById(R.id.chrono_remaining);
// i can only run choro.start() here
}
}
public class MapViewHolder extends ViewHolder {
//MapView
public MapViewHolder(View itemView) {
super(itemView);
// TODO: 24-Dec-15 add map view
}
}
public class CostViewHolder extends ViewHolder {
TextView mCost;
public CostViewHolder(View itemView) {
super(itemView);
this.mCost = (TextView) itemView.findViewById(R.id.text_view_cost);
mCost.setText("20000");
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v;
if (viewType == TIME) {
v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_view_time, parent, false);
return new ParkTimeViewHolder(v);
} else if (viewType == MAP) {
v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_view_map, parent, false);
return new MapViewHolder(v);
} else {
v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_view_cost, parent, false);
return new CostViewHolder(v);
}
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
if(holder.getItemViewType() == TIME) {
ParkTimeViewHolder myHolder = (ParkTimeViewHolder) holder;
} else
if(holder.getItemViewType() == MAP) {
MapViewHolder myHolder = (MapViewHolder) holder;
} else
if(holder.getItemViewType() == COST) {
CostViewHolder myHolder = (CostViewHolder) holder;
}
}
@Override
public int getItemCount() {
return mCardTypes.length;
}
@Override
public int getItemViewType(int position) {
return mCardTypes[position];
}
MainActivity.java
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private RecyclerView mRecyclerView;
private CustomAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private Chronometer mTotalChrono;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mRecyclerView = (RecyclerView) findViewById(R.id.recycle_view_main_activity);
mLayoutManager = new LinearLayoutManager(MainActivity.this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new CustomAdapter(this, new int[]{CustomAdapter.TIME, CustomAdapter.COST});
mRecyclerView.setAdapter(mAdapter);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.fab) {
Snackbar.make(v, "Started", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
// i need to run chrono.start(); from here
}
}
@Override
protected void onStart() {
super.onStart();
}
【问题讨论】：
标签： java android android-recyclerview android-cardview