如何在Android中的可扩展RecyclerView上设置onClickListner
我正在尝试创建一个从本地sqlite数据库获取数据并将它们放入recyclerview的应用程序，下图说明了我要做的事情：
除了要点击类别文字链接的部分外，应用程序工作正常，例如饮料，以便它将返回饮料类别中的所有物品，即2 Mazowe物品。只有当您单击带圆圈的 - 或+符号而不是按下文本时，代码才有效。这是代码：
package com.vhg.empire.merchant.Account;
import android.content.Context;
import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.widget.RecyclerView;
import android.text.InputType;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.vhg.empire.merchant.Cart.AddCartItems;
import com.vhg.empire.merchant.R;
import com.vhg.empire.merchant.database.ProductDetailObject;
import java.util.ArrayList;
import java.util.List;
/**
* Created by VinceGee on 09/30/15.
*/
public class ExpandableListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public static final int HEADER = 0;
public static final int CHILD = 1;
private List<Item> data;
public ExpandableListAdapter(List<Item> data) {
this.data = data;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int type) {
View view = null;
Context context = parent.getContext();
float dp = context.getResources().getDisplayMetrics().density;
int subItemPaddingLeft = (int) (18 * dp);
int subItemPaddingTopAndBottom = (int) (5 * dp);
switch (type) {
case HEADER:
LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.expandable_list_header, parent, false);
ListHeaderViewHolder header = new ListHeaderViewHolder(view);
return header;
case CHILD:
TextView itemTextView = new TextView(context);
itemTextView.setPadding(subItemPaddingLeft, subItemPaddingTopAndBottom, 0, subItemPaddingTopAndBottom);
itemTextView.setTextColor(0x88000000);
itemTextView.setLayoutParams(
new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
return new RecyclerView.ViewHolder(itemTextView) {
};
}
return null;
}
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Item item = data.get(position);
switch (item.type) {
case HEADER:
final ListHeaderViewHolder itemController = (ListHeaderViewHolder) holder;
itemController.refferalItem = item;
itemController.header_title.setText(item.text);
if (item.invisibleChildren == null) {
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_minus);
} else {
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_plus);
}
itemController.btn_expand_toggle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (item.invisibleChildren == null) {
item.invisibleChildren = new ArrayList<Item>();
int count = 0;
int pos = data.indexOf(itemController.refferalItem);
while (data.size() > pos + 1 && data.get(pos + 1).type == CHILD) {
item.invisibleChildren.add(data.remove(pos + 1));
count++;
}
notifyItemRangeRemoved(pos + 1, count);
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_plus);
} else {
int pos = data.indexOf(itemController.refferalItem);
int index = pos + 1;
for (Item i : item.invisibleChildren) {
data.add(index, i);
index++;
}
notifyItemRangeInserted(pos + 1, index - pos - 1);
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_minus);
item.invisibleChildren = null;
}
}
});
break;
case CHILD:
TextView itemTextView = (TextView) holder.itemView;
itemTextView.setText(data.get(position).text);
break;
}
final Item model = data.get(position);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
LinearLayout layout = new LinearLayout(v.getContext());
layout.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(30, 20, 30, 0);
// Set up the input_desc
final EditText input_desc = new EditText(v.getContext());
final EditText input_qty = new EditText(v.getContext());
// Specify the type of input_desc expected; this, for example, sets the input_desc as a password, and will mask the text
input_desc.setInputType(InputType.TYPE_CLASS_TEXT);
input_desc.setHint(R.string.input_hint);
input_qty.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_CLASS_NUMBER);
input_qty.setHint(R.string.input_qty);
layout.addView(input_desc, layoutParams);
layout.addView(input_qty, layoutParams);
try {
if (!model.getProductDetailObject().getP_name().equals(null)) {
AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
builder.setMessage(model.getProductDetailObject().getP_name())
.setView(layout)
.setPositiveButton(R.string.submit, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// FIRE ZE MISSILES!
String m_Text_input_desc = input_desc.getText().toString();
String qnty_int_string = input_qty.getText().toString();
int m_Text_input_qty = 0;
if (qnty_int_string != null && !qnty_int_string.trim().isEmpty() ) {
m_Text_input_qty = Integer.parseInt(qnty_int_string);
}
if (!getValidation(m_Text_input_desc, m_Text_input_qty, input_desc)) {
Toast.makeText(v.getContext(), "Enter valid desc",
Toast.LENGTH_SHORT).show();
return;
}
new AddCartItems().setCartItems(model.getProductDetailObject().getP_name(),
m_Text_input_desc, m_Text_input_qty, false);
Toast.makeText(v.getContext(), "Desc : " + m_Text_input_desc + " Quanity : " + m_Text_input_qty,
Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
//do something
builder.show();
}
} catch (NullPointerException e) {
Toast.makeText(v.getContext(), "Select Product", Toast.LENGTH_SHORT).show();
}
}
});
}
private boolean getValidation(String input_name, int input_qnty, EditText input_desc) {
boolean valid = true;
if (input_name.isEmpty() || input_name.length() < 3) {
input_desc.setError("at least 3 characters");
valid = false;
} else {
input_desc.setError(null);
}
return valid;
}
@Override
public int getItemViewType(int position) {
return data.get(position).type;
}
@Override
public int getItemCount() {
return data.size();
}
private static class ListHeaderViewHolder extends RecyclerView.ViewHolder {
public TextView header_title;
public ImageView btn_expand_toggle;
public Item refferalItem;
public ListHeaderViewHolder(View itemView) {
super(itemView);
header_title = (TextView) itemView.findViewById(R.id.header_title);
btn_expand_toggle = (ImageView) itemView.findViewById(R.id.btn_expand_toggle);
}
}
public static class Item {
public int type;
public String text;
public List<Item> invisibleChildren;
private ProductDetailObject mText;
public Item() {
}
public Item(int type, String text, ProductDetailObject txt) {
this.type = type;
this.text = text;
this.mText = txt;
}
public ProductDetailObject getProductDetailObject() {
return mText;
}
}
}
目前我已经创建了一个try-catch块来满足单击文本时生成的Null指针。 Null-Pointer由toast“选择产品”捕获。请帮助使文本和带圆圈的符号填充子元素。
这是堆栈跟踪：
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant D/AndroidRuntime: Shutting down VM
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: FATAL EXCEPTION: main
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: Process: com.vhg.empire.merchant, PID: 9303
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at com.vhg.empire.merchant.Account.ExpandableListAdapter$3.onClick(ExpandableListAdapter.java:138)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at android.view.View.performClick(View.java:4780)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at android.view.View$PerformClick.run(View.java:19866)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5257)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
10-30 13:52:19.580 9303-9303/com.vhg.empire.merchant E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
ExpandandableListAdapter.java是上面的那一行，第138行是以下行：if（！model.getProductDetailObject（）。getP_name（）。equals（null））{
0 个答案:
没有答案
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