Question

我想在单击回收者视图的对象时显示另一个活动。例如：如果我单击“ dd”文本或“该行的图像”，则应转到名为“ AbcActivity”的活动。

它去了很多站点，看到了youtube教程，但是没有帮助。请帮助我。请帮助我，这是我最后的希望：（

我是新手，如果您能提供项目，那就太好了。

这是主要活动：

public class MainActivity extends AppCompatActivity implements WordAdapter.OnNoteListener {
    private RecyclerView recyclerView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.home_view);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

        recyclerView.setLayoutManager(layoutManager);

        List<Word> wordList = new ArrayList<>();


        wordList.add(new Word(R.drawable.ic_launcher_background, "dd"));
        wordList.add(new Word(R.drawable.ic_launcher_background, "ss"));

        WordAdapter adapter = new WordAdapter(wordList, this);
        recyclerView.setAdapter(adapter);
        adapter.notifyDataSetChanged();
        }

    @Override
    public void onNoteClick(int position) {
    }
}

WordAdapter：

public class WordAdapter extends RecyclerView.Adapter<WordAdapter.viewholder> {

    private List<Word> wordList;
    private OnNoteListener mOnNoteListener;

    public WordAdapter(List<Word> wordList, OnNoteListener onNoteListener) {
        this.wordList = wordList;
        this.mOnNoteListener = onNoteListener;
    }

    @NonNull
    @Override
    public viewholder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_items, viewGroup, false);
        return new viewholder(view, mOnNoteListener);
    }

    @Override
    public void onBindViewHolder(@NonNull viewholder viewholder, int position) {
        int resource = wordList.get(position).getImageResource();
        String title = wordList.get(position).getTitle();
        viewholder.setData(resource, title);
    }

    @Override
    public int getItemCount() {
        return wordList.size();
    }

    class viewholder extends RecyclerView.ViewHolder implements View.OnClickListener{

        private ImageView imageView;
        private TextView title;

        OnNoteListener onNoteListener;
        public viewholder(@NonNull View itemView, OnNoteListener onNoteListener) {
            super(itemView);

            imageView = itemView.findViewById(R.id.image);
            title = itemView.findViewById(R.id.word);
            this.onNoteListener = onNoteListener;

            itemView.setOnClickListener(this);
        }

        private void setData(int resource, String titleText){
            imageView.setImageResource(resource);
            title.setText(titleText);
        }

        @Override
        public void onClick(View view) {
            onNoteListener.onNoteClick(getAdapterPosition());
        }
    }

    public interface OnNoteListener {
        void onNoteClick(int position);
    }
}

这是字：

public class Word implements Parcelable {

   private int imageResource;
   private String title;

    public Word(int imageResource, String title) {
        this.imageResource = imageResource;
        this.title = title;
    }

    protected Word(Parcel in) {
        imageResource = in.readInt();
        title = in.readString();
    }

    public static final Creator<Word> CREATOR = new Creator<Word>() {
        @Override
        public Word createFromParcel(Parcel in) {
            return new Word(in);
        }

        @Override
        public Word[] newArray(int size) {
            return new Word[size];
        }
    };

    public int getImageResource() {
        return imageResource;
    }

    public String getTitle() {
        return title;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeInt(imageResource);
        parcel.writeString(title);
    }
}

Answer 1

您可以为OnClickListener的{{1}}设置viewHolder。

当您点击itemView的{{1}}时，这将启动AbcActivity。

imageView

Answer 2

您几乎完成了所有操作。

剩下的实际上是处理您传递给适配器的侦听器在活动中让您知道的click事件。

更改

@Override
public void onNoteClick(int position) {


}

对此

@Override
public void onNoteClick(int position) {
   Intent intent = new Intent(context, AbcActivity.class);
   context.startActivity(intent);
}

您的活动

Answer 3

您的代码可以正常工作。不知道是什么问题。在启动新活动时，您可能会遇到问题，但是可以肯定，此代码没有问题。我将在您的示例下面发布，并对ViewHolder进行一些小的修改。

    public class MainActivity extends AppCompatActivity implements WordAdapter.OnNoteListener {
    private RecyclerView recyclerView;
    private static final String TAG = MainActivity.class.getCanonicalName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.home_view);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

        recyclerView.setLayoutManager(layoutManager);

        List<Word> wordList = new ArrayList<>();


        wordList.add(new Word(R.drawable.ic_launcher_background, "dd"));
        wordList.add(new Word(R.drawable.ic_launcher_background, "ss"));
        wordList.add(new Word(R.drawable.ic_launcher_background, "cc"));


        WordAdapter adapter = new WordAdapter(this);
        recyclerView.setAdapter(adapter);
        adapter.addItems(wordList);
    }

    @Override
    public void onNoteClick(int position) {
        Log.d(TAG, "clicked on the position:" + position);
    }
}

    public class WordAdapter extends RecyclerView.Adapter<WordAdapter.ViewHolder> {

    private List<Word> wordList;
    private OnNoteListener mOnNoteListener;

    public WordAdapter(List<Word> wordList, OnNoteListener onNoteListener) {
        this.wordList = wordList;
        this.mOnNoteListener = onNoteListener;
    }

    public WordAdapter(OnNoteListener onNoteListener) {
        this(new ArrayList<Word>(), onNoteListener);
    }

    public void addItems(List<Word> items) {
        wordList.addAll(items);
        notifyDataSetChanged();
    }

    public void clear() {
        wordList.clear();
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_items, viewGroup, false);
        return new ViewHolder(view, mOnNoteListener);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewholder, int position) {
        int resource = wordList.get(position).getImageResource();
        String title = wordList.get(position).getTitle();
        viewholder.setData(resource, title);
    }

    @Override
    public int getItemCount() {
        return wordList.size();
    }

    static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        private ImageView imageView;
        private TextView title;

        private OnNoteListener onNoteListener;

        public ViewHolder(@NonNull View itemView, OnNoteListener onNoteListener) {
            super(itemView);

            imageView = itemView.findViewById(R.id.imageView);
            title = itemView.findViewById(R.id.word);
            this.onNoteListener = onNoteListener;

            itemView.setOnClickListener(this);
        }

        private void setData(int resource, String titleText) {
            imageView.setImageResource(resource);
            title.setText(titleText);
        }

        @Override
        public void onClick(View view) {
            onNoteListener.onNoteClick(getAdapterPosition());
        }
    }

    public interface OnNoteListener {
        void onNoteClick(int position);
    }
}

“类别”一词保持不变。
现在，关于xml，我在下面添加了一些快速内容（list_item.xml）：

    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/md_green_100"
    android:orientation="horizontal"
    android:layout_marginTop="4dp"
    android:layout_marginBottom="4dp">

    <TextView
        android:id="@+id/word"
        android:layout_width="86dp"
        android:layout_height="36dp"
        android:layout_marginStart="8dp"

        android:gravity="center"
        android:text="Word 1"
        android:textSize="16sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/imageView"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="120dp"
        android:layout_height="160dp"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:background="@drawable/ic_launcher_background"
        android:contentDescription="Icon"

        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/word"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

您可以在下面找到点击事件的屏幕截图。

现在，知道点击事件可以正常运行，无论您要执行什么操作，startActivity，Log等等。

RecyclerView中的OnClickListener具有图片，文字

3 个答案: