我的应用有一个RecyclerView / CardView of Tasks。每张卡都由我的getAllTasksForUser()类中的TaskTableController适配器填充：
public List<Task> getAllTasksForUser() {
final String QUERY_ALL_RECORDS = "SELECT * FROM " + TaskEntry.TABLE_NAME;
List<Task> taskList = new ArrayList<>();
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(QUERY_ALL_RECORDS, null);
if (cursor.getCount() > 0) {
while (cursor.moveToNext()) {
Task task = new Task();
int TaskId = cursor.getColumnIndex(TaskEntry.COLUMN_TASK_ID);
task.setId(cursor.getString(TaskId));
task.setTitle(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_TITLE)));
task.setDue(new DateTime(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_DUE))));
task.setNotes(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_NOTES)));
task.setStatus(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_STATUS)));
taskList.add(task);
}
} else {
cursor.close();
db.close();
return taskList;
}
cursor.close();
db.close();
return taskList;
}
用于填充Adapter中的TaskArray的Task对象。
public class TaskAdapter extends RecyclerView.Adapter<TaskAdapter.TaskViewHolder> {
private List<Task> taskList;
OnItemClickListener mItemClickListener;
public TaskAdapter(List<Task> taskList) {
this.taskList = taskList;
}
@Override
public int getItemCount() {
return taskList.size();
}
@Override
public void onBindViewHolder(TaskViewHolder taskViewHolder, int i) {
Task task = taskList.get(i);
taskViewHolder.mTitle.setText(task.getTitle());
taskViewHolder.mDue.setText(task.getDue().toString());
if (task.getStatus().equals("completed")) {
taskViewHolder.mStatus.setChecked(true);
} else taskViewHolder.mStatus.setChecked(false);
}
@Override
public TaskViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View itemView = LayoutInflater.from(viewGroup.getContext()).
inflate(R.layout.tasklist_layout, viewGroup, false);
return new TaskViewHolder(itemView);
}
public void SetOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mItemClickListener = mItemClickListener;
}
public interface OnItemClickListener {
void onItemClick(View view , int position);
}
随后在我的MainActivity
taskAdapter = new TaskAdapter(new TaskTableController(getActivity()).getAllTasksForUser());
return rootView;
我的问题是，一旦点击其中一个项目，我如何检索sqlite _ID或另一个唯一标识符，用作另一个Activity /片段中调用的更详细查询的输入（我不确定哪一个）。我试过添加MainActivity
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mRecyclerView.setAdapter(taskAdapter);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
taskAdapter.SetOnItemClickListener(new TaskAdapter.OnItemClickListener() {
@Override
public void onItemClick(View v, int position) {
m_ID = (TextView) v.findViewById(R.id._task_id);
Intent detailIntent = new Intent(v.getContext(), DetailActivity.class);
detailIntent.putExtra("TASK_ID", m_ID.getText().toString());
startActivity(detailIntent);
}
});
}
在我的TaskTableController课程中，我添加了另一种方法
public Task getTaskByID(String Id) {
final String SINGLE_TASK_QUERY = "SELECT * FROM " + TaskEntry.TABLE_NAME +
" WHERE " + TaskEntry._ID + " = " + Id;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(SINGLE_TASK_QUERY, null);
Task task = new Task();
while (cursor.moveToNext()){
task.setId(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_ID)));
task.setTitle(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_TITLE)));
task.setDue(new DateTime(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_DUE))));
task.setNotes(cursor.getString(cursor.getColumnIndex(TaskEntry.COLUMN_TASK_NOTES)));
}
return task;
}
我应该在我的getTaskByID()或我的DetailActivity中致电DetailFragment，该ID负责通知详细视图吗？如何将&.preloader-remove{
-webkit-animation: fadeOutUp 1s;
animation: fadeOutUp 1s;
}
从intent extra传递给查询方法？
答案 0 :(得分：0)
这就是我多数时间的表现：
1.在适配器的构造函数中，添加一个参数（OnClickListener接口）并将其另存为自定义适配器类中的属性。
2.在你的onCreateViewHolder方法中，将你的点击监听器添加到你的视图中（例如，在你的Activity o片段中实现）。在你的情况下：
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listClickListener.onClick(v);
}
});
3.实施此方法，从RecyclerView getChildPosition点击位置。
@Override
public void onClick(View view) {
int itemPosition = recyclerView.getChildPosition(view);
//With the position you should be able to get the object you want to extract from your adapter.
}
我希望这会对人有所帮助。
答案 1 :(得分：0)
Juan Aguilar Guisado的正确答案，例如RecycleviewAdapter
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Picasso.with(mContext).load(R.drawable.add2new).into(holder.image);
holder.text.setText(mDataSet.get(position));
holder.askprice.setText(mAskPrice.get(position));
holder.bidprice.setText(mBidPrice.get(position));
holder.profit.setText(mProfit.get(position));
holder.setClickListener(new FavoriteAdapter.ViewHolder.ClickListener() {
public void onClick(View v, int pos, boolean isLongClick) {
if (isLongClick) {
// View v at position pos is long-clicked.
String poslx = pos + "";
Toast.makeText(mContext, "longclick " + poslx, Toast.LENGTH_SHORT).show();
} else {
// View v at position pos is clicked.
String possx = pos + "";
Toast.makeText(mContext, "shortclick " + possx, Toast.LENGTH_SHORT).show();
//toggleSelection(pos);
}
}
});
}
并在ViewHolder中
static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
public ImageView image;
public TextView text;
public TextView askprice;
public TextView bidprice;
public TextView profit;
private ClickListener clickListener;
public ViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.image);
text = (TextView) itemView.findViewById(R.id.text);
askprice = (TextView) itemView.findViewById(R.id.askprice);
bidprice = (TextView) itemView.findViewById(R.id.bidprice);
profit = (TextView) itemView.findViewById(R.id.profit);
// We set listeners to the whole item view, but we could also
// specify listeners for the title or the icon.
itemView.setOnClickListener(this);
itemView.setOnLongClickListener(this);
}
/* Interface for handling clicks - both normal and long ones. */
public interface ClickListener {
/**
* Called when the view is clicked.
*
* @param v view that is clicked
* @param position of the clicked item
* @param isLongClick true if long click, false otherwise
*/
public void onClick(View v, int position, boolean isLongClick);
}
/* Setter for listener. */
public void setClickListener(ClickListener clickListener) {
this.clickListener = clickListener;
}
@SuppressWarnings("deprecation")
@Override
public void onClick(View v) {
// If not long clicked, pass last variable as false.
clickListener.onClick(v, getPosition(), false);
}
@SuppressWarnings("deprecation")
@Override
public boolean onLongClick(View v) {
// If long clicked, passed last variable as true.
clickListener.onClick(v, getPosition(), true);
return true;
}
}
答案 2 :(得分：0)
@Override
public TaskViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View itemView = LayoutInflater.from(viewGroup.getContext()).
inflate(R.layout.tasklist_layout, viewGroup, false);
TaskViewHolder viewHolder = new TaskViewHolder(itemView);
viewHolder.itemView.setClickable(true);
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (taskListCallbacks != null)
taskListCallbacks.onTaskClick(taskList.get(viewHolder.getAdapterPosition()), v, viewHolder.getAdapterPosition());
}
});
return viewHolder;
}
public void setTaskListCallbacks(TaskListCallbacks taskListCallbacks){
this.taskListCallbacks = taskListCallbacks;
}
public interface TaskListCallbacks{
void onTaskClick(Task task, View v, int position);
}