java - 如何为每个 recyclerview 项目的按钮添加功能?
问题描述
我正在编写一个android代码,其中单击recyclerview上的按钮时,它应该将其定向到其他一些活动。该程序应将控件重定向到每个 recyclerview 项目的不同活动。我已经成功地将按钮添加到活动的模板中,但是,我无法理解如何为每个按钮添加功能。我随函附上我在项目中包含的不同文件。如果有人可以指导我如何从这里开始,那将非常有帮助。
ProductPage1.java
package com.agnik.example.myapplication4;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import java.util.ArrayList;
public class ProductPage1 extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_page1);
ArrayList<ExampleItem> exampleList = new ArrayList<>();
exampleList.add(new ExampleItem(R.drawable.mickeymouse, "Line1" , "Line2"));
exampleList.add(new ExampleItem(R.drawable.donalduck, "Line3" , "Line4"));
exampleList.add(new ExampleItem(R.drawable.popey, "Line5" , "Line6"));
exampleList.add(new ExampleItem(R.drawable.mickeymouse, "Line1" , "Line2"));
exampleList.add(new ExampleItem(R.drawable.donalduck, "Line3" , "Line4"));
exampleList.add(new ExampleItem(R.drawable.popey, "Line5" , "Line6"));
exampleList.add(new ExampleItem(R.drawable.mickeymouse, "Line1" , "Line2"));
exampleList.add(new ExampleItem(R.drawable.donalduck, "Line3" , "Line4"));
exampleList.add(new ExampleItem(R.drawable.popey, "Line5" , "Line6"));
exampleList.add(new ExampleItem(R.drawable.mickeymouse, "Line1" , "Line2"));
exampleList.add(new ExampleItem(R.drawable.donalduck, "Line3" , "Line4"));
exampleList.add(new ExampleItem(R.drawable.popey, "Line5" , "Line6"));
mRecyclerView = findViewById(R.id.recyclerView);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mAdapter = new ExampleAdapter(exampleList);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
}
}
ExampleAdapter.java
package com.agnik.example.myapplication4;
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.util.ArrayList;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
private ArrayList<ExampleItem> mExampleList;
public static class ExampleViewHolder extends RecyclerView.ViewHolder
{
public ImageView mImageView;
public TextView mTextView1;
public TextView mTextView2;
public Button mButton;
public ExampleViewHolder(@NonNull View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.imageView);
mTextView1 = itemView.findViewById(R.id.textView);
mTextView2 = itemView.findViewById(R.id.textView2);
mButton = itemView.findViewById(R.id.mybutton);
}
}
public ExampleAdapter(ArrayList<ExampleItem> exampleList)
{
mExampleList = exampleList;
}
@NonNull
@Override
public ExampleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.example_item, parent, false);
ExampleViewHolder evh = new ExampleViewHolder(v);
return evh;
}
@Override
public void onBindViewHolder(@NonNull ExampleViewHolder holder, int position) {
ExampleItem currentItem = mExampleList.get(position);
holder.mImageView.setImageResource(currentItem.getImageResource());
holder.mTextView1.setText(currentItem.getText1());
holder.mTextView2.setText(currentItem.getText2());
}
@Override
public int getItemCount() {
return mExampleList.size();
}
}
ExampleItem.java
package com.agnik.example.myapplication4;
public class ExampleItem {
private int mImageResource;
private String mText1;
private String mText2;
public ExampleItem(int imageResource, String text1, String text2) {
mImageResource = imageResource;
mText1 = text1;
mText2 = text2;
}
public int getImageResource() {
return mImageResource;
}
public String getText1() {
return mText1;
}
public String getText2() {
return mText2;
}
}
activity_product_page1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ProductPage1">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#008080"
android:padding="4dp"
android:scrollbars="vertical" />
</RelativeLayout>
example_item.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardCornerRadius="4dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp">
<ImageView
android:id="@+id/imageView"
android:layout_width="50dp"
android:layout_height="50dp"
android:padding="2dp" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/imageView"
android:text="Line 1"
android:textColor="@android:color/black"
android:textSize="20sp"
android:textStyle="bold"
android:layout_toRightOf="@+id/imageView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView"
android:layout_marginStart="8dp"
android:layout_toEndOf="@+id/imageView"
android:text="Line 2"
android:textSize="15sp"
android:layout_marginLeft="8dp"
android:layout_toRightOf="@+id/imageView" />
<Button
android:id="@+id/mybutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView2"
android:layout_marginStart="8dp"
android:layout_toEndOf="@+id/imageView"
android:text="Purchase"
android:textSize="15sp"
android:layout_marginLeft="8dp"
android:layout_toRightOf="@+id/imageView" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
activity_product_page1.java
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ProductPage1">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#008080"
android:padding="4dp"
android:scrollbars="vertical" />
</RelativeLayout>
编辑:
正如 Phil 所提到的,我需要将 setOnClickListener 添加到 holder 对象中。但是,当我在 ExampleAdapter.java 上编写代码时,我无法理解如何将控制权从 ProductPage1.class 转移到 SomeOtherActivity.class?
holder.mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (position) {
case 1:
Intent i = new Intent(ProductPage1.class, PageDemo1_1.class);
startActivity(i);
break;
case 2:
Intent i = new Intent(ProductPage1.class, PageDemo1_2.class);
startActivity(i);
break;
case 3:
Intent i = new Intent(ProductPage1.class, PageDemo1_3.class);
startActivity(i);
break;
case 4:
Intent i = new Intent(ProductPage1.class, PageDemo1_4.class);
startActivity(i);
break;
case 5:
Intent i = new Intent(ProductPage1.class, PageDemo1_5.class);
startActivity(i);
break;
case 6:
Intent i = new Intent(ProductPage1.class, PageDemo1_6.class);
startActivity(i);
break;
case 7:
Intent i = new Intent(ProductPage1.class, PageDemo1_7.class);
startActivity(i);
break;
default:
Intent i = new Intent(ProductPage1.class, PageDemo1_3.class);
startActivity(i);
break;
}
}
});
解决方案
您必须在 ExampleAdapter 的 onBindViewHolder 方法中执行此操作。
作为一个例子,你可以这样做:
@Override
public void onBindViewHolder(@NonNull ExampleViewHolder holder, int position) {
ExampleItem currentItem = mExampleList.get(position);
holder.mImageView.setImageResource(currentItem.getImageResource());
holder.mTextView1.setText(currentItem.getText1());
holder.mTextView2.setText(currentItem.getText2());
holder.mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// your code here
}
});
}
在 onBindViewHolder() 方法内部“发生了逻辑”。在那里,您可以为每个 RecyclerView 项目设置所有内容。
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