我打算开发一个应用程序,在其中显示一些动态数据recyclerCardView.所以我决定
在我的主要内部添加一个recyclerView名字.这是我的应用程序的代码:CheckBoxRecyclerViewrecyclerView
我的主要活动:
setContentView(R.layout.activity_startup);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
reminderView = (RecyclerView) findViewById(R.id.reminder_recycler_view);
RlayoutManager = new LinearLayoutManager(this);
reminderView.setLayoutManager(RlayoutManager);
setSupportActionBar(toolbar);
cardView = (CardView) findViewById(R.id.card_first);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext() , ReminderActivity.class);
startActivity(intent);
}
});
ReminderHelper helper = new ReminderHelper(getApplicationContext());
ReminderAdapter reminderAdapter = new ReminderAdapter(helper);
ContentValues reminderValues = new ContentValues();
ContentValues checkboxValues = new ContentValues();
// Devlopment Part ->
reminderValues.put("reminderTitle" , "A Reminder Title");
reminderValues.put("reminderLastModDate" , 0);
reminderValues.put("reminderAlarm" , 0);
reminderValues.put("reminderPicURI" , "skjshksjh");
reminderValues.put("ReminderBackground" , "#00796b");
checkboxValues.put("checkboxText" , "This is a CheckBox");
checkboxValues.put("isDone" , false);
checkboxValues.put("checkboxReminderID" , 0);
reminderAdapter.INSERT_REMINDER(reminderValues);
reminderAdapter.INSERT_CHECKBOX(checkboxValues);
File dbPath = getApplicationContext().getDatabasePath(ReminderHelper.DATABASE_NAME);
if(dbPath.exists()){
List reminders = new ReminderAdapter(helper).getAllReminders();
List checkBoxItems = new ReminderAdapter(helper).getAllCheckBoxes();
RAdapter = new RAdapter(reminders , getApplicationContext() , checkBoxItems);
reminderView.setAdapter(RAdapter);
}else{
}
它的布局文件:
在这个recyclerView里面还有另一个:
他们的适配器,Main(RAdapter):
public class RAdapter extends RecyclerView.Adapter{ List reminder; private Context context; private LinearLayoutManager lln; private CAdapter checkBoxAdapter; private List checkBoxItems; public static class ViewHolder extends RecyclerView.ViewHolder { public CardView rCardView; public RecyclerView recyclerView; public TitleView rTitleView; public ViewHolder(View itemView) { super(itemView); rCardView = (CardView) itemView.findViewById(R.id.reminder_card); rTitleView = (TitleView) itemView.findViewById(R.id.reminder_title); recyclerView = (RecyclerView) itemView.findViewById(R.id.checkbox_recycler_view); } } public RAdapter(List reminder, Context context, List checkBoxItems) { this.reminder = reminder; this.context = context; this.checkBoxItems = checkBoxItems; } @Override public RAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.reminder_card, parent, false); ViewHolder vh = new ViewHolder(v); return vh; } @Override public void onBindViewHolder(RAdapter.ViewHolder holder, int position) { lln = new LinearLayoutManager(context); holder.recyclerView.setLayoutManager(lln); checkBoxAdapter = new CAdapter(checkBoxItems, context); holder.recyclerView.setAdapter(checkBoxAdapter); holder.rCardView.setCardBackgroundColor(Color.parseColor("#00796b")); holder.rTitleView.setText(reminder.get(position).getReminderTitle()); } @Override public int getItemCount() { return reminder.size(); } }
和第二个适配器:
public class CAdapter extends RecyclerView.Adapter{ List checkBoxItems; Context context; public static class ViewHolder extends RecyclerView.ViewHolder { public TitleView checkBoxTitle; public ImageView deleteCheckBox; public CheckBox checkBoxCheckBox; public ViewHolder(View itemView) { super(itemView); checkBoxTitle = (TitleView) itemView.findViewById(R.id.checkbox_item_text); checkBoxCheckBox = (CheckBox) itemView.findViewById(R.id.checkbox_item_checkbox); Log.d("CAdapterLog", "Adpater Holded !!!!! :( "); deleteCheckBox = (ImageView) itemView.findViewById(R.id.btn_delete_checkbox); } } public CAdapter(List checkBoxItems, Context context) { this.checkBoxItems = checkBoxItems; this.context = context; Log.d("CAdapterLog", "Adpater Created !!!!! :( "); } @Override public CAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.checkbox_item, parent, false); ViewHolder vh = new ViewHolder(v); Log.d("CAdapterLog", "Adpater ViewHolded :( !!!!! :( "); return vh; } @Override public void onBindViewHolder(CAdapter.ViewHolder holder, int position) { Boolean isCheckboxChecked = Boolean.parseBoolean(checkBoxItems.get(position).getCheckBoxIsDone()); String checkBoxText = checkBoxItems.get(position).getCheckBoxBody(); Log.d("CAdapterLog", "Adpater Binded :( "); final int checkboxID = Integer.parseInt(checkBoxItems.get(position).getCheckBoxID()); int reminderCheckBoxID = Integer.parseInt(checkBoxItems.get(position).getCheckBoxReminderID()); holder.deleteCheckBox.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.d("CAdapterLog", "Cross Button Clicked !"); } }); holder.checkBoxCheckBox.setChecked(isCheckboxChecked); holder.checkBoxTitle.setText(checkBoxText); } @Override public int getItemCount() { return checkBoxItems.size(); } }
我的问题:正如您在CAdapter中看到的那样,只显示了构造函数的Log消息.
更新:如果有另一种方式在另一个动态卡内显示一些动态数据,如果是,最好使用它而不是recyclerView吗？
有人帮我吗？
输出:应用程序输出
,只看到RTPapter的setTitle有效.
我建议使用单个RecyclerView动态填充列表项.我添加了一个github项目来描述如何做到这一点.你可以看看.虽然其他解决方案可以正常工作,但我想建议,这是一种更快更有效的方式来显示多个列表RecyclerView.
我们的想法是在你的方法onCreateViewHolder和onBindViewHolder方法中添加逻辑,这样你就可以为你的确切位置充气RecyclerView.
我已经添加了一个示例项目以及该wiki.您可以克隆并检查它的作用.
还有另一种方法可以将项目保存在单个ArrayList对象中,以便您可以设置标记项目的属性,以指示哪个项目来自第一个列表,哪个项目属于第二个列表.然后将其传递ArrayList给您RecyclerView,然后在适配器中实现逻辑以动态填充它们.
希望有所帮助.
我一段时间遇到了类似的问题,在我的情况下发生的事情是外部回收器视图工作得非常好,但内部/第二个回收器视图的适配器有小问题所有方法,如构造函数已启动甚至getCount()方法被调用,虽然负责生成视图的最终方法即...
1. onBindViewHolder()方法永远不会被调用. - >问题1.
2.当它最终被调用时,它永远不会显示回收器视图的列表项/行. - >问题2.
发生这种情况的原因 ::当您将回收站视图放在另一个回收站视图中时,第一个/外部回收站视图的高度不会自动调整.它是在创建第一个/外部视图时定义的,然后保持固定.此时,您的第二个/内部回收站视图尚未加载其项目,因此其高度设置为零,即使获取数据也不会更改.然后,当onBindViewHolder()在你的第二/内回收视图被调用时,它得到的物品,但它不具备的空间去展示它们,因为它的高度仍然是零.因此,即使onBindViewHolder()已将它们添加到第二个回收器视图中的项目也不会显示.
解决方案 ::您必须为第二个回收站视图创建自定义LinearLayoutManager,就是这样.要创建自己的LinearLayoutManager: 使用名称创建一个Java类,CustomLinearLayoutManager并将下面的代码粘贴到其中.无需更改
public class CustomLinearLayoutManager extends LinearLayoutManager {
private static final String TAG = CustomLinearLayoutManager.class.getSimpleName();
public CustomLinearLayoutManager(Context context) {
super(context);
}
public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
private int[] mMeasuredDimension = new int[2];
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {
final int widthMode = View.MeasureSpec.getMode(widthSpec);
final int heightMode = View.MeasureSpec.getMode(heightSpec);
final int widthSize = View.MeasureSpec.getSize(widthSpec);
final int heightSize = View.MeasureSpec.getSize(heightSpec);
int width = 0;
int height = 0;
for (int i = 0; i < getItemCount(); i++) {
measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
mMeasuredDimension);
if (getOrientation() == HORIZONTAL) {
width = width + mMeasuredDimension[0];
if (i == 0) {
height = mMeasuredDimension[1];
}
} else {
height = height + mMeasuredDimension[1];
if (i == 0) {
width = mMeasuredDimension[0];
}
}
}
switch (widthMode) {
case View.MeasureSpec.EXACTLY:
width = widthSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
switch (heightMode) {
case View.MeasureSpec.EXACTLY:
height = heightSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
setMeasuredDimension(width, height);
}
private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
int heightSpec, int[] measuredDimension) {
try {
View view = recycler.getViewForPosition(position);
if (view != null) {
RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
getPaddingLeft() + getPaddingRight(), p.width);
int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
getPaddingTop() + getPaddingBottom(), p.height);
view.measure(childWidthSpec, childHeightSpec);
measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
recycler.recycleView(view);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
您可以使用LayoutInflater将动态数据充当布局文件.
更新:首先在CardView的布局中创建一个LinearLayout并为其分配一个ID.之后创建一个要膨胀的布局文件.最后在你onBindViewHolder的"RAdaper"类的方法中.写下这些代码:
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = mInflater.inflate(R.layout.my_list_custom_row, parent, false);
之后,您可以使用RAdapter数据初始化数据和ClickListeners.希望能帮助到你.
这个和这可能有用:)
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