火种轻扫视图与Android中的示例

Tinder滑动查看是许多Android应用程序中最常用的UI组件之一。此功能使我们可以轻松地以巨大的列表形式表示数据。在本文中，我们将介绍如何在我们的Android应用程序中实现此Swipe View功能。

我们将在本文中构建什么?

我们将构建一个简单的应用程序，其中将显示一堆纸牌，其中将显示Geeks for Geeks上提供的不同课程。在这些卡上，我们将添加类似于Tinder的类似滑动的功能。下面给出了一个示例GIF，以了解我们将在本文中做些什么。注意，我们将使用Java语言实现该项目。

分步实施

步骤1：创建一个新项目

要在Android Studio中创建新项目，请参阅如何在Android Studio中创建/启动新项目。请注意，选择Java作为编程语言。

步骤2：在build.gradle中添加以下依赖项

导航到应用程序> Gradle脚本> build.gradle，然后在“依赖项”部分添加以下依赖项。

implementation ‘com.daprlabs.aaron:cardstack:0.3.1-beta0’

添加以上依赖项后，现在同步您的项目，我们将朝着activity_main.xml前进。

步骤3：使用activity_main.xml文件

导航到应用程序> res>布局> activity_main.xml，然后将以下代码添加到该文件中。以下是activity_main.xml文件的代码。

第4步：创建用于存储数据的模式类

导航到应用程序> Java >应用程序的程序包名称>右键单击它>新建> Java类，并将其命名为CourseModal，然后将以下代码添加到其中。在代码中添加了注释，以便更详细地了解。

Java

public class CourseModal {
  
    // variables for our coursename,
    // description,tracks and duration,imageId.
    private String courseName;
    private String courseDuration;
    private String courseTracks;
    private String courseDescription;
  
    public int getImgId() {
        return imgId;
    }
  
    public void setImgId(int imgId) {
        this.imgId = imgId;
    }
  
    private int imgId;
  
    // creating getter and setter methods
    public String getCourseName() {
        return courseName;
    }
  
    public void setCourseName(String courseName) {
        this.courseName = courseName;
    }
  
    public String getCourseDuration() {
        return courseDuration;
    }
  
    public void setCourseDuration(String courseDuration) {
        this.courseDuration = courseDuration;
    }
  
    public String getCourseTracks() {
        return courseTracks;
    }
  
    public void setCourseTracks(String courseTracks) {
        this.courseTracks = courseTracks;
    }
  
    public String getCourseDescription() {
        return courseDescription;
    }
  
    public void setCourseDescription(String courseDescription) {
        this.courseDescription = courseDescription;
    }
  
    // constructor.
    public CourseModal(String courseName, String courseDuration, String courseTracks, String courseDescription, int imgId) {
        this.courseName = courseName;
        this.courseDuration = courseDuration;
        this.courseTracks = courseTracks;
        this.courseDescription = courseDescription;
        this.imgId = imgId;
    }
}

步骤5：为每个可滑动项创建一个新的布局文件

现在要显示堆栈中要刷卡的卡片，我们必须创建一个布局文件。导航至应用程序> res>布局>新建>布局资源文件，并将其命名为course_rv_item，并向其中添加以下代码。在代码中添加了注释，以便更详细地了解。

步骤6：创建适配器类

现在要为堆栈中存在的每个卡设置数据，我们必须创建适配器类。导航到应用程序> Java >应用程序的程序包名称>右键单击它>新建> Java类，并将其命名为DeckAdapter，然后将以下代码添加到其中。在代码中添加了注释，以便更详细地了解。

Java

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
  
import java.util.ArrayList;
  
public class DeckAdapter extends BaseAdapter {
      
    // on below line we have created variables
      // for our array list and context.
    private ArrayList courseData;
    private Context context;
  
    // on below line we have created constructor for our variables.
    public DeckAdapter(ArrayList courseData, Context context) {
        this.courseData = courseData;
        this.context = context;
    }
  
    @Override
    public int getCount() {
        // in get count method we are returning the size of our array list.
        return courseData.size();
    }
  
    @Override
    public Object getItem(int position) {
        // in get item method we are returning the item from our array list.
        return courseData.get(position);
    }
  
    @Override
    public long getItemId(int position) {
        // in get item id we are returning the position.
        return position;
    }
  
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // in get view method we are inflating our layout on below line.
        View v = convertView;
        if (v == null) {
            // on below line we are inflating our layout.
            v = LayoutInflater.from(parent.getContext()).inflate(R.layout.course_rv_item, parent, false);
        }
        // on below line we are initializing our variables and setting data to our variables.
        ((TextView) v.findViewById(R.id.idTVCourseName)).setText(courseData.get(position).getCourseName());
        ((TextView) v.findViewById(R.id.idTVCourseDescription)).setText(courseData.get(position).getCourseDescription());
        ((TextView) v.findViewById(R.id.idTVCourseDuration)).setText(courseData.get(position).getCourseDuration());
        ((TextView) v.findViewById(R.id.idTVCourseTracks)).setText(courseData.get(position).getCourseTracks());
        ((ImageView) v.findViewById(R.id.idIVCourse)).setImageResource(courseData.get(position).getImgId());
        return v;
    }
}

步骤7：使用MainActivity。 Java文件

转到MainActivity。 Java文件并参考以下代码。下面是MainActivity的代码。 Java文件。在代码内部添加了注释，以更详细地了解代码。

Java

import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
  
import androidx.appcompat.app.AppCompatActivity;
  
import com.daprlabs.cardstack.SwipeDeck;
  
import java.util.ArrayList;
  
public class MainActivity extends AppCompatActivity {
    // on below line we are creating variable 
    // for our array list and swipe deck.
    private SwipeDeck cardStack;
    private ArrayList courseModalArrayList;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
          
        // on below line we are initializing our array list and swipe deck.
        courseModalArrayList = new ArrayList<>();
        cardStack = (SwipeDeck) findViewById(R.id.swipe_deck);
          
        // on below line we are adding data to our array list.
        courseModalArrayList.add(new CourseModal("C++", "30 days", "20 Tracks", "C++ Self Paced Course", R.drawable.gfg));
        courseModalArrayList.add(new CourseModal("Java", "30 days", "20 Tracks", "Java Self Paced Course", R.drawable.gfg));
        courseModalArrayList.add(new CourseModal("Python", "30 days", "20 Tracks", "Python Self Paced Course", R.drawable.gfg));
        courseModalArrayList.add(new CourseModal("DSA", "30 days", "20 Tracks", "DSA Self Paced Course", R.drawable.gfg));
        courseModalArrayList.add(new CourseModal("PHP", "30 days", "20 Tracks", "PHP Self Paced Course", R.drawable.gfg));
          
          // on below line we are creating a variable for our adapter class and passing array list to it.
        final DeckAdapter adapter = new DeckAdapter(courseModalArrayList, this);
          
          // on below line we are setting adapter to our card stack.
        cardStack.setAdapter(adapter);
          
          // on below line we are setting event callback to our card stack.
        cardStack.setEventCallback(new SwipeDeck.SwipeEventCallback() {
            @Override
            public void cardSwipedLeft(int position) {
                // on card swipe left we are displaying a toast message.
                Toast.makeText(MainActivity.this, "Card Swiped Left", Toast.LENGTH_SHORT).show();
            }
  
            @Override
            public void cardSwipedRight(int position) {
                // on card swipped to right we are displaying a toast message.
                Toast.makeText(MainActivity.this, "Card Swiped Right", Toast.LENGTH_SHORT).show();
            }
  
            @Override
            public void cardsDepleted() {
                // this method is called when no card is present
                Toast.makeText(MainActivity.this, "No more courses present", Toast.LENGTH_SHORT).show();
            }
  
            @Override
            public void cardActionDown() {
                // this method is called when card is swipped down.
                Log.i("TAG", "CARDS MOVED DOWN");
            }
  
            @Override
            public void cardActionUp() {
                // this method is called when card is moved up.
                Log.i("TAG", "CARDS MOVED UP");
            }
        });
    }
}

现在运行您的应用程序，并查看该应用程序的输出。

输出：