Java 线性布局单击不工作，我做错了什么？
我有一个视图，我想将其设置为可单击以打开新活动。代码运行时没有任何错误，但当我单击主活动中的列表时，什么也没有发生。列表显示正常，但当单击特定数据时，什么也没有发生。这是适配器的代码Java 线性布局单击不工作，我做错了什么？,java,android,firebase,android-recyclerview,Java,Android,Firebase,Android Recyclerview,我有一个视图，我想将其设置为可单击以打开新活动。代码运行时没有任何错误，但当我单击主活动中的列表时，什么也没有发生。列表显示正常，但当单击特定数据时，什么也没有发生。这是适配器的代码 package com.example.helpresponse; import android.content.Context; import android.content.Intent; import android.support.annotation.NonNull; import android.su
package com.example.helpresponse;
import android.content.Context;
import android.content.Intent;
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.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Locale;
public class TargetDataAdapter extends RecyclerView.Adapter<TargetDataAdapter.TargetViewHolder>{
ArrayList<AndroidTargets> targetsArrayList;
private Context context;
private HandleClick mHandleClick;
public TargetDataAdapter(ArrayList<AndroidTargets> mTargetData) {
targetsArrayList = mTargetData;
}
public void setmHandleClick(HandleClick handleClick) {
this.mHandleClick = handleClick;
}
@NonNull
@Override
public TargetViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
context = viewGroup.getContext();
View v= LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.target_row,viewGroup,false);
return new TargetViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull TargetViewHolder viewHolder, int i) {
viewHolder.androidTargetName.setText(targetsArrayList.get(i).FIELD1 );
viewHolder.androidTargetNumber.setText(String.format(Locale.getDefault(), "API Level: %d", targetsArrayList.get(i).FIELD2));
viewHolder.androidTargetShortName.setText(targetsArrayList.get(i).FIELD3);
viewHolder.myClickableView.setClickable(true);
/*
viewHolder.myClickableView.setOnClickListener((v) -> {
Intent intent = new Intent(context, MapsActivity.class);
//int myData = 1;
//intent.putExtra("myDataKey", myData);
//more intent.putExtra(s) as needed
context.startActivity(intent);
});
*/
viewHolder.myClickableView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Do your stuff
Intent intent = new Intent(context, MapsActivity.class);
int myData = 1;
intent.putExtra("myDataKey", myData);
//more intent.putExtra(s) as needed
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
if(targetsArrayList == null)
return 0;
return targetsArrayList.size();
}
public class TargetViewHolder extends RecyclerView.ViewHolder {
protected TextView androidTargetName;
protected TextView androidTargetNumber;
protected TextView androidTargetShortName;
protected LinearLayout myClickableView;
public TargetViewHolder(@NonNull View itemView) {
super(itemView);
myClickableView = itemView.findViewById(R.id.linearLayout);
androidTargetShortName = itemView.findViewById(R.id.textView2);
androidTargetName = itemView.findViewById(R.id.textView3);
androidTargetNumber = itemView.findViewById(R.id.textView4);
}
}
public interface HandleClick {
void onItemClick(int index);
}
}
package com.example.helpresponse；
导入android.content.Context；
导入android.content.Intent；
导入android.support.annotation.NonNull；
导入android.support.v7.widget.RecyclerView；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.LinearLayout；
导入android.widget.TextView；
导入android.widget.Toast；
导入java.util.ArrayList；
导入java.util.Locale；
公共类TargetDataAdapter扩展了RecyclerView.Adapter{
ArrayList targetsArrayList；
私人语境；
私人HandleClick mHandleClick；
公共TargetDataAdapter（ArrayList mTargetData）{
targetsArrayList=mTargetData；
}
公共无效设置HandleClick（HandleClick HandleClick）{
this.mHandleClick=handleClick；
}
@非空
@凌驾
public TargetViewHolder onCreateViewHolder（@NonNull ViewGroup ViewGroup，int i）{
context=viewGroup.getContext（）；
视图v=LayoutInflater.from（viewGroup.getContext（））.flate（R.layout.target_行，viewGroup，false）；
返回新的TargetViewHolder（v）；
}
@凌驾
BindViewHolder上的公共无效（@NonNull TargetViewHolder viewHolder，int i）{
viewHolder.androidTargetName.setText（targetsArrayList.get（i.FIELD1））；
viewHolder.androidTargetNumber.setText（String.format（Locale.getDefault（），“API级别：%d”，targetsArrayList.get（i.FIELD2））；
viewHolder.androidTargetShortName.setText（targetsArrayList.get（i.FIELD3））；
viewHolder.myClickableView.setClickable（true）；
/*
viewHolder.myClickableView.setOnClickListener（（v）->{
意向意向=新意向（上下文，MapsActivity.class）；
//int myData=1；
//intent.putExtra（“myDataKey”，myData）；
//更多意图。根据需要添加额外内容
背景。开始触觉（意图）；
});
*/
viewHolder.myClickableView.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
//做你的事
意向意向=新意向（上下文，MapsActivity.class）；
int myData=1；
intent.putExtra（“myDataKey”，myData）；
//更多意图。根据需要添加额外内容
背景。开始触觉（意图）；
}
});
}
@凌驾
public int getItemCount（）{
if（targetsArrayList==null）
返回0；
返回targetsArrayList.size（）；
}
公共类TargetViewHolder扩展了RecyclerView.ViewHolder{
受保护的TextView androidTargetName；
受保护的TextView androidTargetNumber；
受保护的TextView androidTargetShortName；
受保护的线性布局myClickableView；
公共TargetViewHolder（@NonNull View itemView）{
超级（项目视图）；
myClickableView=itemView.findViewById（R.id.linearLayout）；
androidTargetShortName=itemView.findViewById（R.id.textView2）；
androidTargetName=itemView.findViewById（R.id.textView3）；
androidTargetNumber=itemView.findViewById（R.id.textView4）；
}
}
公共接口HandleClick{
void-onItemClick（int-index）；
}
}
package com.example.helpresponse;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
import java.util.List;
public class ShowStudentDetailsActivity extends AppCompatActivity {
DatabaseReference databaseReference;
ProgressDialog progressDialog;
List<StudentDetails> list = new ArrayList<>();
RecyclerView recyclerView;
RecyclerView.Adapter adapter ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_student_details);
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(ShowStudentDetailsActivity.this));
progressDialog = new ProgressDialog(ShowStudentDetailsActivity.this);
progressDialog.setMessage("Loading Data from Firebase Database");
progressDialog.show();
databaseReference = FirebaseDatabase.getInstance().getReference("Police").child("Chats");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
StudentDetails studentDetails = dataSnapshot.getValue(StudentDetails.class);
list.add(studentDetails);
}
adapter = new RecyclerViewAdapter(ShowStudentDetailsActivity.this, list);
recyclerView.setAdapter(adapter);
progressDialog.dismiss();
}
@Override
public void onCancelled(DatabaseError databaseError) {
progressDialog.dismiss();
}
});
}
}
package com.example.helpresponse；
导入android.app.ProgressDialog；
导入android.content.Intent；
导入android.os.Bundle；
导入android.support.v7.app.AppActivity；
导入android.support.v7.widget.LinearLayoutManager；
导入android.support.v7.widget.RecyclerView；
导入android.util.Log；
导入android.view.view；
导入android.widget.AdapterView；
导入com.google.firebase.database.DataSnapshot；
导入com.google.firebase.database.DatabaseError；
导入com.google.firebase.database.DatabaseReference；
导入com.google.firebase.database.FirebaseDatabase；
导入com.google.firebase.database.ValueEventListener；
导入java.util.ArrayList；
导入java.util.List；
公共类ShowStudentDetailsActivity扩展了AppCompatActivity{
数据库参考数据库参考；
进行对话进行对话；
列表=新的ArrayList（）；
回收视图回收视图；
RecyclerView.适配器；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u show\u student\u details）；
recyclerView=findViewById（R.id.recyclerView）；
recyclerView.setHasFixedSize（true）；
setLayoutManager（新的LinearLayoutManager（ShowStudentDetailsActivity.this））；
progressDialog=新建progressDialog（ShowStudentDetailsActivity.this）；
setMessage（“从Firebase数据库加载数据”）；
progressDialog.show（）；
databaseReference=FirebaseDatabase.getInstance（）.getReference（“警察”）.child（“聊天”）；
databaseReference.addValueEventListener（新的ValueEventListener（）{
@凌驾
公共无效onDataChange（数据快照快照）{
对于（DataSnapshot DataSnapshot:snapshot.getChildren（））{
StudentDetails StudentDetails=dataSnapshot.getValue（StudentDetails.class）；
列表。添加（学生详细信息）；
}
适配器=新的RecycleServiceAdapter（ShowStudentDetailsActivity.this，列表）；
recyclerView.setAdapter（适配器）；
progressDialog.disclose（）；
}
@凌驾
已取消的公共void（DatabaseError DatabaseError）{
progressDialog.disclose（）；
}
});
}
}
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
>
<TextView
android:id="@+id/textView2"
android:textColor="@color/colorPrimary"
style="@style/Base.TextAppearance.AppCompat.Small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:gravity="center"
android:text="textview"
android:minWidth="100dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:clickable="true"/>
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/textView2"
app:layout_constraintTop_toTopOf="parent"
android:clickable="true"
>
<TextView
android:id="@+id/textView3"
android:gravity="center_vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_marginBottom="8dp"
android:text="textview"
android:clickable="true"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/textView4"
android:gravity="center_vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="textview"
android:clickable="true"/>
</LinearLayout>
</android.support.constraint.ConstraintLayout>
public class ShowStudentDetailsActivity extends AppCompatActivity {
DatabaseReference databaseReference;
ProgressDialog progressDialog;
List<StudentDetails> list = new ArrayList<>();
RecyclerView recyclerView;
TargetDataAdapter adapter;
adapter = new TargetDataAdapter(list);
public class TargetDataAdapter extends RecyclerView.Adapter<TargetDataAdapter.TargetViewHolder>{
ArrayList<AndroidTargets> targetsArrayList;
private Context context;
private HandleClick mHandleClick;
public TargetDataAdapter(ArrayList<AndroidTargets> mTargetData) {
targetsArrayList = mTargetData;
}
public void setmHandleClick(HandleClick handleClick) {
this.mHandleClick = handleClick;
}
@NonNull
@Override
public TargetViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
context = viewGroup.getContext();
View v= LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.target_row,viewGroup,false);
return new TargetViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull TargetViewHolder viewHolder, int i) {
viewHolder.androidTargetName.setText(targetsArrayList.get(i).FIELD1 );
viewHolder.androidTargetNumber.setText(String.format(Locale.getDefault(), "API Level: %d", targetsArrayList.get(i).FIELD2));
viewHolder.androidTargetShortName.setText(targetsArrayList.get(i).FIELD3);
viewHolder.myClickableView.setClickable(true);
viewHolder.myClickableView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Do your stuff
mHandleClick.onItemClick(i);//here is where you call the onItemClick method in the interface
}
});
}
public interface HandleClick {
void onItemClick(int index);
}
}
//Take note of the implements keyword
public class ShowStudentDetailsActivity extends AppCompatActivity, implements HandleClick {
DatabaseReference databaseReference;
ProgressDialog progressDialog;
ArrayList<StudentDetails> list = new ArrayList<>();
RecyclerView recyclerView;
TargetDataAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_student_details);
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(ShowStudentDetailsActivity.this));
progressDialog = new ProgressDialog(ShowStudentDetailsActivity.this);
progressDialog.setMessage("Loading Data from Firebase Database");
progressDialog.show();
databaseReference = FirebaseDatabase.getInstance().getReference("Police").child("Chats");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
StudentDetails studentDetails = dataSnapshot.getValue(StudentDetails.class);
list.add(studentDetails);
}
adapter = new TargetDataAdapter(list);
/*The this keyword below parses whatever setmHandleClick() method needs that's present in that same class, which is the onItemClick() method in the interface that we implemented. So, the this keyword simply is a reference to ShowStudentDetailsActivity as an object, including all it resources like context */
adapter.setmHandleClick(this)
recyclerView.setAdapter(adapter);
progressDialog.dismiss();
}
@Override
public void onCancelled(DatabaseError databaseError) {
progressDialog.dismiss();
}
});
}
/* This is the result of the implemented interface above using implements keyword
you will note that without the below method, our class will show error and it's
basically telling us to do like below. So, when you implement an interface, you will be forced to have all its method implemented like below also.
I will suggest you read more on interface in java.*/
@Override
void onItemClick(int index){
//note that we have moved the code that was in the adapter back to the activity it self.
Intent intent = new Intent(this, MapsActivity.class);
int myData = index;
intent.putExtra("myDataKey", myData);
startActivity(intent);
}
}
public interface HandleClick {
void onItemClick(int index);
}
public class TargetDataAdapter extends RecyclerView.Adapter<TargetDataAdapter.TargetViewHolder>{
private ArrayList<AndroidTargets> targetsArrayList;
private HandleClick mHandleClick;
/*Note that the constructor now take two params which helps us get ride of setmHandleClick() method.*/
public TargetDataAdapter(ArrayList<AndroidTargets> mTargetData, HandleClick handleClick) {
targetsArrayList = mTargetData;
mHandleClick = handleClick;
}
@NonNull
@Override
public TargetViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View v= LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.target_row,viewGroup,false);
return new TargetViewHolder(v);
}
/* There is an interesting way to make below code neater by abstracting it back to the Activity incharge, let me know if you want that...priority now is to focus on fixing your issue. */
@Override
public void onBindViewHolder(@NonNull TargetViewHolder viewHolder, int i) {
viewHolder.androidTargetName.setText(targetsArrayList.get(i).FIELD1 );
viewHolder.androidTargetNumber.setText(String.format(Locale.getDefault(), "API Level: %d", targetsArrayList.get(i).FIELD2));
viewHolder.androidTargetShortName.setText(targetsArrayList.get(i).FIELD3);
viewHolder.myClickableView.setClickable(true);
viewHolder.myClickableView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mHandleClick.onItemClick(i);
}
});
}
}
//Note that you can implement more than one interfaces, that's one of it's beauty.
public class ShowStudentDetailsActivity extends AppCompatActivity, implements HandleClick {
private DatabaseReference databaseReference;
ProgressDialog progressDialog;
private ArrayList<StudentDetails> list = new ArrayList<>();
private RecyclerView recyclerView;
private TargetDataAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_student_details);
initRecyclerView();
initProgressDialog("Loading Data from Firebase Database");
progressDialog.show();
databaseReference = FirebaseDatabase.getInstance().getReference("Police").child("Chats");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
StudentDetails studentDetails = dataSnapshot.getValue(StudentDetails.class);
list.add(studentDetails);
}
adapter = new TargetDataAdapter(list, this);
recyclerView.setAdapter(adapter);
progressDialog.dismiss();
}
@Override
public void onCancelled(DatabaseError databaseError) {
progressDialog.dismiss();
}
});
}
private void initProgressDialog(String msg){
progressDialog = new ProgressDialog(this);
progressDialog.setMessage(msg);
}
private void initRecyclerView(){
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
/*LinearLayoutManager.VERTICAL is to set the orientation of my list items in the recyclerView, and the boolean value When set to true, layouts from end to start, otherwise start to end.*/
recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
}
@Override
void onItemClick(int index){
Intent intent = new Intent(this, MapsActivity.class);
int myData = index;
intent.putExtra("myDataKey", myData);
startActivity(intent);
}
}
public interface IHomeSelector{
void onCategorySelected(int postion);
}
private TextView category;
private ImageView category_icon;
private IHomeSelector iHomeSelector;
public ViewHolder(@NonNull View itemView, IHomeSelector iHomeSelector) {
super(itemView);
category = itemView.findViewById(R.id.category_title);
category_icon = itemView.findViewById(R.id.category_icon);
this.iHomeSelector = iHomeSelector;
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
iHomeSelector.onCategorySelected(getAdapterPosition());
}
}
public class HomeRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private ArrayList<String> mCategories = new ArrayList<>();
private Context mContext;
private IHomeSelector mIHomeSelector;
public HomeRecyclerAdapter(ArrayList<String> mCategories, Context mContext, IHomeSelector mIHomeSelector) {
this.mCategories = mCategories;
this.mContext = mContext;
this.mIHomeSelector = mIHomeSelector;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(mContext).inflate(R.layout.layout_category_list_item, null);
return new ViewHolder(view, mIHomeSelector);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
((ViewHolder)viewHolder).category.setText(mCategories.get(i));
RequestOptions requestOptions = new RequestOptions()
.error(R.drawable.ic_launcher_background);
Drawable iconResource = null;
switch(mCategories.get(i)){
case "Music":{
iconResource = ContextCompat.getDrawable(mContext, R.drawable.ic_audiotrack_white_24dp);
break;
}
case "Podcasts":{
iconResource = ContextCompat.getDrawable(mContext, R.drawable.ic_mic_white_24dp);
break;
}
}
Glide.with(mContext)
.setDefaultRequestOptions(requestOptions)
.load(iconResource)
.into(((ViewHolder)viewHolder).category_icon);
}
@Override
public int getItemCount() {
return mCategories.size();
}
public class HomeFragment extends Fragment implements HomeRecyclerAdapter.IHomeSelector
private static final String TAG = "HomeFragment";
// UI Components
private RecyclerView mRecyclerView;
// Vars
private HomeRecyclerAdapter mAdapter;
private ArrayList<String> mCategories = new ArrayList<>();
private IMainActivity mIMainActivity;
public static HomeFragment newInstance(){
return new HomeFragment();
}
@Override
public void onHiddenChanged(boolean hidden) {
if(!hidden){
mIMainActivity.setActionBarTitle(getString(R.string.categories));
}
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
initRecyclerView(view);
mIMainActivity.setActionBarTitle(getString(R.string.categories));
}
private void initRecyclerView(View view){
mRecyclerView = view.findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mAdapter = new HomeRecyclerAdapter(mCategories, getActivity(), this); // passing 3 rd parameter this for interface
mRecyclerView.setAdapter(mAdapter);
}
@Override
public void onCategorySelected(int postion) {
Log.d(TAG, "onCategorySelected: list item is clicked!");
//Here implement you code not in adapter
}
}