单击“回收视图”以打开URL

Question

我有一个回收站视图，可以根据我的列表动态生成视图中的元素。但是我不知道如何动态地将我的URL分配给网站图像，这样当用户点击我的UI中的网站图像时，它将打开一个新的浏览器，并为其分配URL。

例如，如果用户点击第一张卡片R.drawable.website图片，它将打开＆＃34;我的网址1＆＃34;。如果他点击第二张卡R.drawable.website图片，它将打开＆＃34;我的网址2＆＃34;。

我想在我的主要活动中使用intent，但我看到的所有示例都指定了网站URL，具体意味着我只能指定1个网址。我想知道这是否可以在 RVAdapter类中完成。

RVAdapter.java

import android.content.Intent;
import android.net.Uri;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.ImageView;


import com.example.utsav.edufind.R;
import java.util.List;

import entity.PolytechnicCourse;
import entity.UniversityCourse;
import entity.Course;

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.CourseViewHolder> {

    public static class CourseViewHolder extends RecyclerView.ViewHolder {

        CardView cv;
        TextView CourseName;
        TextView SchoolName;
        TextView CourseGrade;
        TextView CourseIntake;
        ImageView CourseWebsite;
        ImageView SchoolLogo;
        TextView gradeTitle;

        CourseViewHolder(View itemView) {
            super(itemView);
            cv = itemView.findViewById(R.id.cv);
            CourseName = itemView.findViewById(R.id.Course_name);
            CourseGrade= itemView.findViewById(R.id.Course_Grade);
            SchoolName = itemView.findViewById(R.id.School_name);
            CourseIntake = itemView.findViewById(R.id.Course_Intake);
            CourseWebsite = itemView.findViewById(R.id.Course_Website);
            SchoolLogo = itemView.findViewById(R.id.School_Logo);
            gradeTitle = itemView.findViewById(R.id.Course_Grade_Title);

        }
    }

    List<Course> courses;

    public RVAdapter(List<Course> courses){
        this.courses = courses;
    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }

    @Override
    public CourseViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
        CourseViewHolder pvh = new CourseViewHolder(v);
        return pvh;
    }

    @Override
    public void onBindViewHolder(CourseViewHolder CourseViewHolder, int i) {
        if(courses.get(i) instanceof PolytechnicCourse) {
            switch (courses.get(i).getSchool()) {

                case "Singapore Polytechnic": {
                    CourseViewHolder.SchoolLogo.setImageResource(R.mipmap.sp);
                    break;
                }

                case "Ngee Ann Polytechnic": {
                    CourseViewHolder.SchoolLogo.setImageResource(R.mipmap.np);
                    break;
                }

                case "Republic Polytechnic": {
                    CourseViewHolder.SchoolLogo.setImageResource(R.mipmap.rp);
                    break;
                }

                case "Nanyang Polytechnic": {
                    CourseViewHolder.SchoolLogo.setImageResource(R.mipmap.nyp);
                    break;
                }

                case "Temasek Polytechnic": {
                    CourseViewHolder.SchoolLogo.setImageResource(R.mipmap.tp);
                    break;
                }

                default:
            }
            CourseViewHolder.SchoolName.setText(courses.get(i).getSchool());
            CourseViewHolder.CourseName.setText(courses.get(i).getCourseName());
            CourseViewHolder.CourseGrade.setText(String.valueOf(((PolytechnicCourse) courses.get(i)).getL1R4()));
            CourseViewHolder.CourseIntake.setText(String.valueOf(courses.get(i).getIntake()));
            CourseViewHolder.CourseWebsite.setImageResource(R.drawable.website);

            // I want to retrieve the url from String.valueOf(courses.get(i).getWebsite());
            // and put them into a clickable image url (R.drawable.website)
            // In my main UI, when i click on the website logo, it will open up the url in a browser
            CourseViewHolder.CourseWebsite.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //Problem 1 (variable i is not accessible within inner class)
                    //Problem 2 (startActivity cannot be resolved)
                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(String.valueOf(courses.get(i).getWebsite())));
                    startActivity(browserIntent);
                }
            });
            CourseViewHolder.gradeTitle.setText("L1R4");
        }

这是我在主页的列表中放入的内容

SearchResultsUI.java

 private void initializeData(){
        courseList = new ArrayList<>();

        courseList.add(new PolytechnicCourse("Diploma in Business Management", "Nanyang Polytechnic",25, 13, "my web URL1"));
        courseList.add(new PolytechnicCourse("Diploma in Digital Media", "Singapore Polytechnic", 400, 11, "my web URL2"));
        courseList.add(new PolytechnicCourse("Diploma in Accountancy", "Singapore Polytechnic", 6700, 19, "my web URL3"));
        courseList.add(new PolytechnicCourse("Diploma in Biological Sciences", "Temasek Polytechnic", 300, 12, "my web URL4"));
    }

这是我的XML文件

items.xml

    <?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/cv"
    android:layout_marginBottom="20dp"
    android:elevation="3dp"
    >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="0dp"
        android:background="@drawable/relative_background_with_shadow"
        >


        <ImageView
            android:id="@+id/School_Logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:contentDescription="School Logo"/>

        <TextView
            android:id="@+id/Course_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toEndOf="@+id/School_Logo"
            android:layout_marginTop="15dp"
            android:textSize="16sp"
            android:textColor="@color/colorAccent"/>

        <TextView
            android:id="@+id/School_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/Course_name"
            android:layout_toEndOf="@+id/School_Logo"
            android:textSize="13sp"
            android:textColor="@color/gray"/>

        <View
            android:id="@+id/view"
            style="@style/Divider"
            android:layout_below="@+id/School_Logo"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/view"
            android:orientation="horizontal"
            android:paddingBottom="10dp"
            android:background="@drawable/linear_background_with_shadow"
            android:gravity="center">

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAlignment="center"
                android:layout_marginEnd="40dp">
                <ImageView
                    android:id="@+id/Course_Grade_Circle"
                    android:layout_width="65dp"
                    android:layout_height="65dp"
                    android:layout_marginTop="10dp"
                    android:layout_marginLeft="3dp"
                    android:background="@drawable/greencircle"/>
                <TextView
                    android:id="@+id/Course_Grade"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="30dp"
                    android:width="80dp"
                    android:textSize="22sp"
                    android:textAlignment="center"
                    android:textStyle="bold"
                    android:textColor="@color/white"
                    android:paddingStart="9dp"
                    android:paddingEnd="20dp"/>
                <TextView
                    android:id="@+id/Course_Grade_Title"
                    android:layout_width="60dp"
                    android:layout_height="wrap_content"
                    android:layout_below="@+id/Course_Grade_Circle"
                    android:textSize="16sp"
                    android:layout_marginTop="7dp"
                    android:text="@string/L1R4"
                    android:textAlignment="center"
                    android:layout_marginStart="4dp"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center">
                <ImageView
                    android:id="@+id/Course_Intake_Circle"
                    android:layout_width="65dp"
                    android:layout_height="65dp"
                    android:layout_marginLeft="5dp"
                    android:layout_marginTop="10dp"
                    android:background="@drawable/greencircle"/>
                <TextView
                    android:id="@+id/Course_Intake"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="28dp"
                    android:minWidth="80dp"
                    android:maxWidth="200dp"
                    android:layout_marginStart="0dp"
                    android:textSize="22sp"
                    android:textAlignment="center"
                    android:textStyle="bold"
                    android:textColor="@color/white"/>
                <TextView
                    android:id="@+id/Course_Intake_Title"
                    android:layout_width="60dp"
                    android:layout_height="wrap_content"
                    android:layout_below="@+id/Course_Intake_Circle"
                    android:textSize="16sp"
                    android:layout_marginTop="7dp"
                    android:text="@string/intake"
                    android:textAlignment="center"
                    android:layout_marginStart="8dp"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:layout_marginStart="40dp">
                <ImageView
                    android:id="@+id/Course_Website"
                    android:layout_width="65dp"
                    android:layout_height="65dp"
                    android:layout_marginTop="10dp"
                    android:contentDescription="Course Website Icon"/>
                <TextView
                    android:id="@+id/Course_Website_Title"
                    android:layout_width="60dp"
                    android:layout_height="wrap_content"
                    android:layout_below="@+id/Course_Website"
                    android:textSize="16sp"
                    android:text="@string/website"
                    android:layout_marginTop="7dp"
                    android:textAlignment="center"
                    android:layout_marginStart="6dp"/>
            </RelativeLayout>
        </LinearLayout>
    </RelativeLayout>
</android.support.v7.widget.CardView>

Answer 1

   CourseViewHolder.CourseWebsite.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("<add url here>"));
            mContext.startActivity(browserIntent);
        }
    });

从对象中获取url并添加它。

如果您不知道如何传递上下文，请按照以下步骤操作

在创建适配器对象时将活动上下文作为第二个参数

的活动

RVAdapter rvAdapter = new RVAdapter(CourseList,this);

在循环视图类中获取上下文

Context mContext;
public RVAdapter(List<Course> courses,Context context){
    this.courses = courses;
    mContext  = context
}

Answer 2

首先，您需要将setOnClickListener函数添加到ImageView。

CourseViewHolder.CourseWebsite.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });

接下来，您需要修改RVAdapter构造函数，使其具有context属性。 Context将用于startActivity。

List<Course> courses;

// Add this property
Context context

// Modify constructor
public RVAdapter(Context context, List<Course> courses){
    this.context = context
    this.courses = courses;
}

接下来，在setOnClickListener

中

@Override
public void onClick(View v) {
    final String website = this.courses.get(i).getWebsite()
    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(website));
    this.context.startActivity(browserIntent);            
}