我似乎找不到我遇到的问题的问题,即当我导航到ResidenceFrag片段时,在实现了回收视图后它将停止工作。只是片段工作得很好,但是在实现回收视图后,该视图不再起作用。以下是我的文件。谢谢。
ResidenceFrag.java
package com.example.ezhome;
import android.os.Bundle;
import android.support.annotation.Nullable;
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 java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class ResidenceFrag extends Fragment {
View v;
MHS mhs;
private RecyclerView recyclerView;
private ArrayList<Residence> resList;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
v = inflater.inflate(R.layout.residence_frag, container, false);
mhs = new MHS();
resList = mhs.getResidences();
Collections.sort(resList, new Comparator<Residence>(){
@Override
public int compare(Residence r1, Residence r2){
return r1.getName().compareTo(r2.getName());
}
});
recyclerView = (RecyclerView) v.findViewById(R.id.rvItems);
ViewResidenceAdapter adapter = new ViewResidenceAdapter(getContext(),resList);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(adapter);
return v;
}
}
MHS.java
package com.example.ezhome;
import java.util.ArrayList;
public class MHS {
public ArrayList<Residence> residences;
public Applicant applicant;
public MHS() {
setResidences(new ArrayList<Residence>());
residences.add(new Residence("ResB","A_address123",12,200,300,"micro1.jpg"));
residences.add(new Residence("ResA","B_address123",17,228,390,"micro2.jpg"));
}
public void submitApp(Application app){
applicant.addApplication(app);
}
public ArrayList<Residence> getResidences() {
return residences;
}
public void setResidences(ArrayList<Residence> residences) {
this.residences = residences;
}
}
Residence.java
package com.example.ezhome;
import java.util.ArrayList;
public class Residence {
private static int nextResidenceID = 1;
private String residenceID, address;
private int numUnits, i;
private double sizePerUnit, monthlyRental;
private ArrayList<Unit> units;
private String name;
private String image;
public Residence(String name, String address, int numUnits, double sizePerUnit, double monthlyRental, String image) {
setName(name);
setAddress(address);
setNumUnits(numUnits);
setSizePerUnit(sizePerUnit);
setMonthlyRental(monthlyRental);
setResidenceID();
setImage(image);
// setUnits(new ArrayList<Unit>());
// for(i = 0; i < numUnits; i++){
// Unit unit = new Unit(this);
// }
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static int getNextResidenceID() {
return nextResidenceID;
}
public static void setNextResidenceID(int nextResidenceID) {
Residence.nextResidenceID = nextResidenceID;
}
public String getResidenceID() {
return residenceID;
}
public void setResidenceID() {
this.residenceID = String.format("RES" + nextResidenceID++);
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getNumUnits() {
return numUnits;
}
public void setNumUnits(int numUnits) {
this.numUnits = numUnits;
}
public double getSizePerUnit() {
return sizePerUnit;
}
public void setSizePerUnit(double sizePerUnit) {
this.sizePerUnit = sizePerUnit;
}
public double getMonthlyRental() {
return monthlyRental;
}
public void setMonthlyRental(double monthlyRental) {
this.monthlyRental = monthlyRental;
}
public ArrayList<Unit> getUnits() {
return units;
}
public void setUnits(ArrayList<Unit> units) {
this.units = units;
}
public void addUnit(Unit unit) {
getUnits().add(unit);
}
}
ViewResidenceAdapter.java
package com.example.ezhome;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
public class ViewResidenceAdapter extends RecyclerView.Adapter<ViewResidenceAdapter.ViewHolder>{
private ArrayList<Residence> resList;
private Context context;
public ViewResidenceAdapter(Context context, ArrayList<Residence> resList){
this.context = context;
this.resList = resList;
}
@Override
public ViewResidenceAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View inflater = LayoutInflater.from(context).inflate(R.layout.customlayout, parent, false);
ViewHolder viewHolder = new ViewHolder(inflater);
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull ViewResidenceAdapter.ViewHolder holder, int position) {
Residence res = resList.get(position);
try{
holder.nameTextView.setText(res.getName());
holder.sizeTextView.setText(res.getSizePerUnit() + " sqft");
holder.addressTextView.setText(res.getAddress());
holder.monthlyRentalTextView.setText("RM " + res.getMonthlyRental() + "/month");
holder.applyButton.setTag(res.getResidenceID());
String imageFile = res.getImage();
InputStream inputStream = context.getAssets().open(imageFile);
Drawable d = Drawable.createFromStream(inputStream, null);
holder.resImg.setImageDrawable(d);
} catch (IOException e){
e.printStackTrace();
}
}
public int getItemCount() {
return resList.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView nameTextView;
public TextView sizeTextView;
public TextView addressTextView;
public TextView monthlyRentalTextView;
public ImageView resImg;
public Button applyButton;
public ViewHolder (View itemView){
super(itemView);
nameTextView = (TextView)itemView.findViewById(R.id.nameTextView);
sizeTextView = (TextView)itemView.findViewById(R.id.sizeTextView);
addressTextView = (TextView)itemView.findViewById(R.id.addressTextView);
monthlyRentalTextView = (TextView)itemView.findViewById(R.id.monthlyRentalTextView);
resImg = (ImageView)itemView.findViewById(R.id.resImg);
applyButton = (Button)itemView.findViewById(R.id.applyButton);
}
}
}
MainActivity.java
package com.example.ezhome;
import android.support.annotation.NonNull;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private DrawerLayout drawer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.nav_drawer_open, R.string.nav_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new HomeFrag()).commit();
navigationView.setCheckedItem(R.id.nav_home);
}
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
if(item.getItemId() == R.id.nav_home){
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new HomeFrag()).commit();
} else if (item.getItemId() == R.id.nav_res){
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new ResidenceFrag()).commit();
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onBackPressed() {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
最佳答案
解决:可绘制图像v24问题
关于java - 已解决:Android Studio:在片段中实现回收 View 时出错,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/58568135/