我对Android很新，目前正在开发聊天应用。我打算将RecyclerView实现到多个TabLayout中，并且我仍然坚持将回收器视图的片段扩展到Fragment类中。以下是所涉及的源代码。
fragment_one.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:emojicon="http://schemas.android.com/apk/res-auto"
android:id="@+id/contentRoot"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@color/background">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<android.support.v7.widget.RecyclerView
android:id="@+id/messageRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none" />
<View
android:layout_width="match_parent"
android:layout_height="4dp"
android:layout_gravity="bottom"
android:background="@drawable/shadow_top" />
</FrameLayout>
<RelativeLayout
android:background="#fff"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="2dp">
<ImageView
android:id="@+id/buttonEmoji"
android:layout_width="40dp"
android:layout_height="40dp"
android:padding="4dp"
android:src="@drawable/smiley"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignBottom="@+id/editTextMessage"
/>
<hani.momanii.supernova_emoji_library.Helper.EmojiconEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/editTextMessage"
android:layout_toStartOf="@+id/buttonMessage"
android:layout_toRightOf="@+id/buttonEmoji"
android:layout_toEndOf="@+id/buttonEmoji"
emojicon:emojiconSize="28sp"/>
<ImageView
android:id="@+id/buttonMessage"
android:src="@android:drawable/ic_menu_send"
android:layout_width="40dp"
android:layout_height="40dp"
android:padding="4dp"
android:layout_alignBottom="@+id/editTextMessage"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
/>
</RelativeLayout>
</LinearLayout>
Adapter.java
package example.asuspc.prospect;
/**
* Created by asus pc on 12/2/2016.
*/
import android.content.Context;
import android.media.Image;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;
/**
* Created by asus pc on 11/3/2016.
*/
public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
private static final int TYPE_HEADER = 0; // Declaring Variable to Understand which View is being worked on
// IF the view under inflation and population is header or Item
private static final int TYPE_ITEM = 1;
private String mNavTitles[]; // String Array to store the passed titles Value from MainActivity.java
private int mIcons[]; // Int Array to store the passed icons resource value from MainActivity.java
private String name; //String Resource for header View Name
private int profile; //int Resource for header view profile picture
private String email; //String Resource for header view email
// Creating a ViewHolder which extends the RecyclerView View Holder
// ViewHolder are used to to store the inflated views in order to recycle them
public static class ViewHolder extends RecyclerView.ViewHolder {
int Holderid;
TextView textView;
ImageView imageView;
ImageView profile;
TextView Name;
TextView email;
public ViewHolder(View itemView,int ViewType) { // Creating ViewHolder Constructor with View and viewType As a parameter
super(itemView);
// Here we set the appropriate view in accordance with the the view type as passed when the holder object is created
if(ViewType == TYPE_ITEM) {
textView = (TextView) itemView.findViewById(R.id.rowText); // Creating TextView object with the id of textView from item_row.xml
imageView = (ImageView) itemView.findViewById(R.id.rowIcon);// Creating ImageView object with the id of ImageView from item_row.xml
Holderid = 1; // setting holder id as 1 as the object being populated are of type item row
}
else{
Name = (TextView) itemView.findViewById(R.id.name); // Creating Text View object from header.xml for name
email = (TextView) itemView.findViewById(R.id.email); // Creating Text View object from header.xml for email
profile = (ImageView) itemView.findViewById(R.id.circleView);// Creating Image view object from header.xml for profile pic
Holderid = 0; // Setting holder id = 0 as the object being populated are of type header view
}
}
}
Adapter(String Titles[],int Icons[],String Name,String Email, int Profile){ // MyAdapter Constructor with titles and icons parameter
// titles, icons, name, email, profile pic are passed from the main activity as we
mNavTitles = Titles; //have seen earlier
mIcons = Icons;
name = Name;
email = Email;
profile = Profile; //here we assign those passed values to the values we declared here
//in adapter
}
//Below first we ovverride the method onCreateViewHolder which is called when the ViewHolder is
//Created, In this method we inflate the item_row.xml layout if the viewType is Type_ITEM or else we inflate header.xml
// if the viewType is TYPE_HEADER
// and pass it to the view holder
@Override
public Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_ITEM) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.custom_row,parent,false); //Inflating the layout
ViewHolder vhItem = new ViewHolder(v,viewType); //Creating ViewHolder and passing the object of type view
return vhItem; // Returning the created object
//inflate your layout and pass it to view holder
} else if (viewType == TYPE_HEADER) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.header,parent,false); //Inflating the layout
ViewHolder vhHeader = new ViewHolder(v,viewType); //Creating ViewHolder and passing the object of type view
return vhHeader; //returning the object created
}
return null;
}
//Next we override a method which is called when the item in a row is needed to be displayed, here the int position
// Tells us item at which position is being constructed to be displayed and the holder id of the holder object tell us
// which view type is being created 1 for item row
@Override
public void onBindViewHolder(Adapter.ViewHolder holder, int position) {
if(holder.Holderid ==1) { // as the list view is going to be called after the header view so we decrement the
// position by 1 and pass it to the holder while setting the text and image
holder.textView.setText(mNavTitles[position - 1]); // Setting the Text with the array of our Titles
holder.imageView.setImageResource(mIcons[position -1]);// Settimg the image with array of our icons
}
else{
holder.profile.setImageResource(profile); // Similarly we set the resources for header view
holder.Name.setText(name);
holder.email.setText(email);
}
}
// This method returns the number of items present in the list
@Override
public int getItemCount() {
return mNavTitles.length+1; // the number of items in the list will be +1 the titles including the header view.
}
// Witht the following method we check what type of view is being passed
@Override
public int getItemViewType(int position) {
if (isPositionHeader(position))
return TYPE_HEADER;
return TYPE_ITEM;
}
private boolean isPositionHeader(int position) {
return position == 0;
}
}
OneFragment.java
package example.asuspc.prospect;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class OneFragment extends Fragment{
public OneFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_one, container, false);
return rootView;
}
}
我正在尝试在OneFragment.java中对循环器视图进行充气，但我完全被困在这里。真的很感激，如果有人可以提供帮助
答案 0 :(得分：2)
更新OneFragment，如下所示：
public class OneFragment extends Fragment {
// Context
Context mContext;
// RecyclerView
RecyclerView mRecyclerView;
Adapter mAdapter;
RecyclerView.LayoutManager mLayoutManager;
// Values
private String[] mNavTitles = {"Title One", "Title Two", "Title Three"};
private int[] mIcons = {R.drawable.icon1, R.drawable.icon2, R.drawable.icon3};
private String mName;
private String mEmail;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Context
mContext = getActivity();
rootView = inflater.inflate(R.layout.fragment_one, container, false);
// Views
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.messageRecyclerView);
// 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(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mName = "Android";
mEmail = "android@google.com";
// specify an adapter
mAdapter = new Adapter(getActivity(), mNavTitles, mIcons, mName, mEmail, R.drawable.profile_icon);
mRecyclerView.setAdapter(mAdapter);
return rootview;
}
.................
......................
}
更新Adapter课程如下：
package example.asuspc.prospect;
/**
* Created by asus pc on 12/2/2016.
*/
import android.content.Context;
import android.media.Image;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;
/**
* Created by asus pc on 11/3/2016.
*/
public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
private static final int TYPE_HEADER = 0; // Declaring Variable to Understand which View is being worked on
// IF the view under inflation and population is header or Item
private static final int TYPE_ITEM = 1;
private String mNavTitles[]; // String Array to store the passed titles Value from MainActivity.java
private int mIcons[]; // Int Array to store the passed icons resource value from MainActivity.java
private String name; //String Resource for header View Name
private int profile; //int Resource for header view profile picture
private String email; //String Resource for header view email
private Context mContext;
Adapter(Context context, String Titles[],int Icons[],String Name,String Email, int Profile) {
mNavTitles = Titles;
mIcons = Icons;
name = Name;
email = Email;
profile = Profile;
this.mContext = context;
}
// Creating a ViewHolder which extends the RecyclerView View Holder
// ViewHolder are used to to store the inflated views in order to recycle them
public static class ViewHolder extends RecyclerView.ViewHolder {
int Holderid;
TextView textView;
ImageView imageView;
ImageView profile;
TextView Name;
TextView email;
public ViewHolder(View itemView,int ViewType) { // Creating ViewHolder Constructor with View and viewType As a parameter
super(itemView);
// Here we set the appropriate view in accordance with the the view type as passed when the holder object is created
if(ViewType == TYPE_ITEM) {
textView = (TextView) itemView.findViewById(R.id.rowText); // Creating TextView object with the id of textView from item_row.xml
imageView = (ImageView) itemView.findViewById(R.id.rowIcon);// Creating ImageView object with the id of ImageView from item_row.xml
Holderid = 1; // setting holder id as 1 as the object being populated are of type item row
}
else{
Name = (TextView) itemView.findViewById(R.id.name); // Creating Text View object from header.xml for name
email = (TextView) itemView.findViewById(R.id.email); // Creating Text View object from header.xml for email
profile = (ImageView) itemView.findViewById(R.id.circleView);// Creating Image view object from header.xml for profile pic
Holderid = 0; // Setting holder id = 0 as the object being populated are of type header view
}
}
}
//Below first we ovverride the method onCreateViewHolder which is called when the ViewHolder is
//Created, In this method we inflate the item_row.xml layout if the viewType is Type_ITEM or else we inflate header.xml
// if the viewType is TYPE_HEADER
// and pass it to the view holder
@Override
public Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_ITEM) {
View v = LayoutInflater.from(mContext).inflate(R.layout.custom_row,parent,false); //Inflating the layout
ViewHolder vhItem = new ViewHolder(v,viewType); //Creating ViewHolder and passing the object of type view
return vhItem; // Returning the created object
//inflate your layout and pass it to view holder
} else if (viewType == TYPE_HEADER) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.header,parent,false); //Inflating the layout
ViewHolder vhHeader = new ViewHolder(v,viewType); //Creating ViewHolder and passing the object of type view
return vhHeader; //returning the object created
}
return null;
}
//Next we override a method which is called when the item in a row is needed to be displayed, here the int position
// Tells us item at which position is being constructed to be displayed and the holder id of the holder object tell us
// which view type is being created 1 for item row
@Override
public void onBindViewHolder(Adapter.ViewHolder holder, int position) {
if(holder.Holderid ==1) { // as the list view is going to be called after the header view so we decrement the
// position by 1 and pass it to the holder while setting the text and image
holder.textView.setText(mNavTitles[position - 1]); // Setting the Text with the array of our Titles
holder.imageView.setImageResource(mIcons[position -1]);// Settimg the image with array of our icons
}
else{
holder.profile.setImageResource(profile); // Similarly we set the resources for header view
holder.Name.setText(name);
holder.email.setText(email);
}
}
// This method returns the number of items present in the list
@Override
public int getItemCount() {
return mNavTitles.length+1; // the number of items in the list will be +1 the titles including the header view.
}
// Witht the following method we check what type of view is being passed
@Override
public int getItemViewType(int position) {
if (isPositionHeader(position))
return TYPE_HEADER;
return TYPE_ITEM;
}
private boolean isPositionHeader(int position) {
return position == 0;
}
}
答案 1 :(得分：0)
初始化回收站视图，设置布局管理器，然后设置适配器。
答案 2 :(得分：0)
我希望这会对你有帮助 -
View rootView = inflater.inflate(R.layout.fragment_one, container, false);
RecyclerView recyclerView = (RecyclerView) rootView .findViewById(R.id.messageRecyclerView);
Adapter mAdapter = new Adapter(dItem, getActivity());
// GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 2);
LinearLayoutManager lnrLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setAdapter(mAdapter);
recyclerView.setLayoutManager(gridLayoutManager);
：
List<modelClassItem> dItem;
Context context;
public Adapter(List<modelClassItem> doItem, Context context) {
this.doItem = doItem;
this.context = context;
}