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法律研究如何在Android中创建水平ListView？
此示例演示了如何在Android中创建水平ListView。
步骤1 - 在Android Studio中创建一个新项目，转到文件 ⇒ 新建项目，并填写所有必需的详细信息以创建新项目。
请在Gradle中添加以下依赖项 -
implementation 'com.android.support:recyclerview-v7:28.0.0' implementation 'com.android.support:cardview-v7:28.0.0'
步骤2 - 将以下代码添加到res/layout/activity_main.xml中。
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="6dp" tools:context=".MainActivity"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/recyclerView" android:layout_centerInParent="true" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout>
步骤3 - 将以下代码添加到src/MainActivity.java中
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import java.util.ArrayList;
import java.util.Arrays;
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
RecyclerView.Adapter adapter;
ArrayList<String> numberName;
ArrayList<Integer> numberImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
numberName = new ArrayList<>(Arrays.asList("Four...", "Nine... ", "Seven...", "Six...", "Ten...", "Three...", "Two..."));
numberImage = new ArrayList<>(Arrays.asList(R.drawable.four, R.drawable.nine, R.drawable.seven,
R.drawable.six, R.drawable.ten, R.drawable.three, R.drawable.two));
// Calling the RecyclerView
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
// The number of Columns
layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(layoutManager);
adapter = new MyAdapter(MainActivity.this, numberName, numberImage);
recyclerView.setAdapter(adapter);
}
}步骤4 - 创建一个Java类（MyAdapter.java）并添加以下代码 -
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import androidx.recyclerview.widget.RecyclerView;
class MyAdapter extends RecyclerView.Adapter <MyAdapter.ViewHolder>{
private ArrayList<String>numberName;
private ArrayList<Integer> numberImage;
private Context context;
MyAdapter(Context context, ArrayList<String> numberName, ArrayList<Integer> numberImage) {
super();
this.context = context;
this.numberName = numberName;
this.numberImage = numberImage;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.gridlayout, viewGroup, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
viewHolder.textView.setText(numberName.get(i));
viewHolder.imgThumbnail.setImageResource(numberImage.get(i));
viewHolder.setClickListener(new ItemClickListener() {
@Override
public void onClick(View view, int position, boolean isLongClick) {
if (isLongClick) {
Toast.makeText(context, "#" + position + " - " + numberName.get(position) + " (Long
click)", Toast.LENGTH_SHORT).show();
context.startActivity(new Intent(context, MainActivity.class));
} else {
Toast.makeText(context, "#" + position + " - " + numberName.get(position),
Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public int getItemCount() {
return numberName.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,
View.OnLongClickListener {
ImageView imgThumbnail;
TextView textView;
private ItemClickListener clickListener;
ViewHolder(View itemView) {
super(itemView);
imgThumbnail = itemView.findViewById(R.id.imgThumbnail);
textView = itemView.findViewById(R.id.textView);
itemView.setOnClickListener(this);
itemView.setOnLongClickListener(this);
}
void setClickListener(ItemClickListener itemClickListener) {
this.clickListener = itemClickListener;
}
@Override
public void onClick(View view) {
clickListener.onClick(view, getPosition(), false);
}
@Override
public boolean onLongClick(View view) {
clickListener.onClick(view, getPosition(), true);
return true;
}
}
}
步骤5 - 创建一个布局资源文件并在listitem中添加以下代码
<?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:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <androidx.cardview.widget.CardView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="0dp" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" android:layout_marginTop="9dp" card_view:cardCornerRadius="3dp" card_view:cardElevation="0.01dp"> <RelativeLayout android:id="@+id/topLayout" android:layout_width="match_parent" android:layout_height="160dp"> <ImageView android:id="@+id/imgThumbnail" android:layout_width="match_parent" android:layout_height="150dp" android:layout_above="@+id/textView" android:layout_centerHorizontal="true" android:scaleType="fitXY" /> <TextView android:id="@+id/textView" android:layout_width="fill_parent" android:layout_height="40dp" android:layout_alignParentBottom="true" android:layout_alignParentStart="true" android:layout_gravity="bottom" anroid:background="#ff444444" android:gravity="center_vertical" android:paddingStart="5dp" android:paddingEnd="2dp" android:text="Test" android:textColor="#fff" android:textSize="20sp" /> </RelativeLayout> </androidx.cardview.widget.CardView> </LinearLayout>
步骤6 - 创建一个接口（ItemClickListener.java）并添加以下代码 -
import android.view.View;
interface ItemClickListener {
void onClick(View view, int position, boolean isLongClick);
}步骤7 - 将以下代码添加到androidManifest.xml中
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要从Android Studio运行应用程序，请打开项目的活动文件之一，然后单击工具栏中的运行
图标。选择您的移动设备作为选项，然后检查您的移动设备，它将显示您的默认屏幕 -
更新于： 2020年7月8日
845 次浏览
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