Android 无法单击或选择RecyclerView中的按钮
我在RecyclerView中放置了一个按钮以将其移动到下一个活动,但当我单击该按钮时,它没有执行任何操作,包括没有将其移动到下一个活动 我试着把按钮放在RecyclerView外面,但是当RecyclerView出现时,按钮就不见了。我试图修改所有关于RecyclerView的代码,但没有成功 这是展示它的活动Android 无法单击或选择RecyclerView中的按钮,android,firebase,firebase-realtime-database,Android,Firebase,Firebase Realtime Database,我在RecyclerView中放置了一个按钮以将其移动到下一个活动,但当我单击该按钮时,它没有执行任何操作,包括没有将其移动到下一个活动 我试着把按钮放在RecyclerView外面,但是当RecyclerView出现时,按钮就不见了。我试图修改所有关于RecyclerView的代码,但没有成功 这是展示它的活动 package com.example.rsolveapp; import android.app.Activity; import android.content.Intent;
package com.example.rsolveapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
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;
public class RsolverMatch extends AppCompatActivity {
private DatabaseReference database;
private RecyclerView rvView;
private RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
private ArrayList<Description> daftarBarang;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.rsolvermatch);
rvView = (RecyclerView) findViewById(R.id.rv_main);
rvView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
rvView.setLayoutManager(layoutManager);
database = FirebaseDatabase.getInstance().getReference();
database.child("description").addValueEventListener(new
ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
daftarBarang = new ArrayList<>();
for (DataSnapshot noteDataSnapshot :
dataSnapshot.getChildren()) {
Description description =
noteDataSnapshot.getValue(Description.class);
description.setKey(noteDataSnapshot.getKey());
daftarBarang.add(description);
}
adapter = new AdapterDescRecyclerView(daftarBarang,
RsolverMatch.this);
rvView.setAdapter(adapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
System.out.println(databaseError.getDetails() + " " +
databaseError.getMessage());
}
});
}
public static Intent getActIntent(Activity activity){
return new Intent(activity, RsolverMatch.class);
}
}
这是按钮的第一个.xml布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dip"
android:background="@drawable/background1">
<android.support.v7.widget.CardView
android:id="@+id/cv_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:padding="10dp"
android:layout_gravity="center_horizontal"
card_view:cardBackgroundColor="@color/background_material_light"
card_view:cardCornerRadius="3dp"
card_view:cardElevation="2.5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/descText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Description : "
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_margin="8dp"
android:id="@+id/tv_namabarang"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/dayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Working Day :"
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_margin="8dp"
android:id="@+id/tv_day"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/daysHour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Working Hour : "
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_shour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
<TextView
android:layout_marginTop="8dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=":"
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_smin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/dayeHour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End Working Hour : "
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_ehour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
<TextView
android:layout_marginTop="8dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=":"
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_emin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
<Button
android:id="@+id/takeJob"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Take Job"
android:background="@color/green"
android:layout_marginTop="10dp"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/background1">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"/>
</LinearLayout>
这是按钮的第二个.xml布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dip"
android:background="@drawable/background1">
<android.support.v7.widget.CardView
android:id="@+id/cv_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:padding="10dp"
android:layout_gravity="center_horizontal"
card_view:cardBackgroundColor="@color/background_material_light"
card_view:cardCornerRadius="3dp"
card_view:cardElevation="2.5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/descText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Description : "
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_margin="8dp"
android:id="@+id/tv_namabarang"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/dayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Working Day :"
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_margin="8dp"
android:id="@+id/tv_day"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/daysHour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Working Hour : "
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_shour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
<TextView
android:layout_marginTop="8dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=":"
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_smin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_margin="8dp"
android:id="@+id/dayeHour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End Working Hour : "
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_ehour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
<TextView
android:layout_marginTop="8dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=":"
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:layout_marginTop="8dp"
android:id="@+id/tv_emin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
<Button
android:id="@+id/takeJob"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Take Job"
android:background="@color/green"
android:layout_marginTop="10dp"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/background1">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"/>
</LinearLayout>
预期的结果是可以单击该按钮并将其移动到下一个活动。
以下是logcat中的错误消息:
E/AndroidRuntime:致命异常:主
进程:com.example.rsolveapp,PID:13737
java.lang.RuntimeException:无法启动活动组件信息{com.example.rsolveapp/com.example.rsolveapp.RsolverMatch}:
java.lang.NullPointerException:尝试调用虚拟方法“void”
android.widget.Button.setOnClickListenerandroid.view.view$OnClickListener'
关于空对象引用
在android.app.ActivityThread.PerformLaunchActivityActivityRead.java:2914
在android.app.ActivityThread.handleLaunchActivityYaActivityThread.java:3049
在android.app.servertransaction.LaunchActivityItem.ExecuteLanchActivityItem.java:78
在android.app.servertransaction.TransactionExecutor.ExecuteCallbackTransactionExecutor.java:108
在android.app.servertransaction.TransactionExecutor.executeTransactionExecutor.java:68
在android.app.ActivityThread$H.handleMessageActivityThread.java:1809
在android.os.Handler.dispatchMessageHandler.java:106
在android.os.Looper.Looper.java:193
在android.app.ActivityThread.mainActivityThread.java:6692
在java.lang.reflect.Method.Invokenactive方法中
位于com.android.internal.os.RuntimeInit$MethodAndArgsCaller.RuntimeInit.java:493
位于com.android.internal.os.ZygoteInit.mainZygoteInit.java:858
原因:java.lang.NullPointerException:尝试调用虚拟方法“void”
android.widget.Button.setOnClickListenerandroid.view.view$OnClickListener'
关于空对象引用
在com.example.rsolveapp.RsolverMatch.onCreateRsolverMatch.java:56
在android.app.Activity.performCreateActivity.java:7140
在android.app.Activity.performCreateActivity.java:7131
在android.app.Instrumentation.callActivityOnCreateInstrumentation.java:1272
在android.app.ActivityThread.PerformLaunchActivityActivityRead.java:2894
在android.app.ActivityThread.handleLaunchActivityYaActivityThread.java:3049
在android.app.servertransaction.LaunchActivityItem.ExecuteLanchActivityItem.java:78
在android.app.servertransaction.TransactionExecutor.ExecuteCallbackTransactionExecutor.java:108
在android.app.servertransaction.TransactionExecutor.executeTransactionExecutor.java:68
在android.app.ActivityThread$H.handleMessageActivityThread.java:1809
在android.os.Handler.dispatchMessageHandler.java:106
在android.os.Looper.Looper.java:193
在android.app.ActivityThread.mainActivityThread.java:6692
在java.lang.reflect.Method.Invokenactive方法中
位于com.android.internal.os.RuntimeInit$MethodAndArgsCaller.RuntimeInit.java:493
位于com.android.internal.os.ZygoteInit.mainZygoteInit.java:858
这是我的AdapterRecyclView活动
public class AdapterDescRecyclerView extends
RecyclerView.Adapter<AdapterDescRecyclerView.ViewHolder> {
private ArrayList<Description> daftarBarang;
private Context context;
public AdapterDescRecyclerView(ArrayList<Description> barangs, Context ctx){
daftarBarang = barangs;
context = ctx;
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView tvTitle;
TextView tvday;
TextView tvshour;
TextView tvsmin;
TextView tvehour;
TextView tvemin;
CardView cvMain;
ViewHolder(View v) {
super(v);
tvTitle = (TextView) v.findViewById(R.id.tv_namabarang);
tvday = (TextView) v.findViewById(R.id.tv_day);
tvshour = (TextView) v.findViewById(R.id.tv_shour);
tvsmin = (TextView) v.findViewById(R.id.tv_smin);
tvehour = (TextView) v.findViewById(R.id.tv_ehour);
tvemin = (TextView) v.findViewById(R.id.tv_emin);
cvMain = (CardView) v.findViewById(R.id.cv_main);
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v =
LayoutInflater.from(parent.getContext()).inflate(R.layout.item_job,
parent, false);
// mengeset ukuran view, margin, padding, dan parameter layout lainnya
ViewHolder vh = new ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
final String name = daftarBarang.get(position).getDescription();
final String day = daftarBarang.get(position).getDay();
final String shour = daftarBarang.get(position).getsHour();
final String smin = daftarBarang.get(position).getsMin();
final String ehour = daftarBarang.get(position).geteHour();
final String emin = daftarBarang.get(position).geteMin();
holder.tvTitle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
holder.tvTitle.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
return true;
}
});
holder.tvTitle.setText(name);
holder.tvday.setText(day);
holder.tvshour.setText(shour);
holder.tvsmin.setText(smin);
holder.tvehour.setText(ehour);
holder.tvemin.setText(emin);
}
@Override
public int getItemCount() {
return daftarBarang.size();
}
}
这是我的Rsolvermatch活动,它已强制onclicklistener,但导致错误
package com.example.rsolveapp;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
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;
public class RsolverMatch extends AppCompatActivity implements
View.OnClickListener {
private DatabaseReference database;
private RecyclerView rvView;
private RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
private ArrayList<Description> daftarBarang;
Button takeJob;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.rsolvermatch);
rvView = (RecyclerView) findViewById(R.id.rv_main);
rvView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
rvView.setLayoutManager(layoutManager);
takeJob.setOnClickListener(this);
takeJob = findViewById(R.id.takeJob);
database = FirebaseDatabase.getInstance().getReference();
database.child("description").addValueEventListener(new
ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
daftarBarang = new ArrayList<>();
for (DataSnapshot noteDataSnapshot : dataSnapshot.getChildren())
{
Description description =
noteDataSnapshot.getValue(Description.class);
description.setKey(noteDataSnapshot.getKey());
daftarBarang.add(description);
}
adapter = new AdapterDescRecyclerView(daftarBarang,
RsolverMatch.this);
rvView.setAdapter(adapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
System.out.println(databaseError.getDetails() + " " +
databaseError.getMessage());
}
});
}
@Override
public void onClick(View v) {
if (v == takeJob) {
Intent intent = new Intent(RsolverMatch.this, Chatting.class);
startActivity(intent);
}
}
public static Intent getActIntent (Activity activity){
return new Intent(activity, RsolverMatch.class);
}
}
您应该将按钮的setOnClickListener放在适配器的onBindViewHolder函数中。并将该位置用作viewHolder.getAdapterPosition;当你们点击recyclerview中任何一项的按钮时。同时传递你们做startActivity所需要的任何参数;在适配器的构造函数中。您做得对 现在只需在布局项_job.xml中添加一个按钮,然后执行以下操作
在onBindViewHolder中显示适配器“AdapterDesRecyclerView”的代码,其中是按钮的单击侦听器,同时添加适配器的代码。您有点忘记添加包含setOnClickListener的相关代码。@Makarand adapter已添加到我的代码中summary@EpicPandaForce已经准备好了onclicklistener,但是我从中得到了一个错误,所以我再次删除了它。我试图引用另一个布局中的按钮,但我不知道怎么做,我已经尝试将rsolvermatch活动中的onClickListener引用到itemjob.xml。因此,在从中获得错误后,我删除了onclick侦听器。我添加了Rsolvermatch活动,其中包括导致我添加错误的onclick侦听器before@BryanRatin您还可以在视图持有者类中设置click listener。若要设置完整项的侦听器,请单击“在视图上设置侦听器”,然后进入视图 Holder类构造函数。