按钮为recycleView

时间：2017-04-19 04:16:35

标签： android android-recyclerview

这是我的活动类，它有回收视图。现在我可以点击循环视图中的项目，它将打开另一个类。当我点击它时，我有一个按钮，我希望它打开课程。所以基本上重复当我按下项目而不是按钮时会发生什么。当我滚动时，我尝试使用此int position3 = recyclerView.getChildLayoutPosition(v);更改项目的位置，以便我可以根据项目本身打开活动类，但是我收到此错误。

  

android.widget.LinearLayout $ LayoutParams无法强制转换为android.support.v7.widget.RecyclerView $ LayoutParams`。

 FirebaseDatabase firebaseDatabaseInstance;
    private DatabaseReference booksInstance;
    AlbumDBHandler db;
    ArrayList<BookData> books = new ArrayList<>();
    private String TAG = mainActivityCarasoul.class.getSimpleName();
    private GalleryAdapter mAdapter;
    private RecyclerView recyclerView;
    private Button button;
    private int position2;

       @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main_activity_carasoul);
             final CarouselLayoutManager layoutManager = new CarouselLayoutManager(CarouselLayoutManager.HORIZONTAL, true);
            layoutManager.setPostLayoutListener(new CarouselZoomPostLayoutListener2());

            recyclerView = (RecyclerView) findViewById(R.id.recycler_view_carasoul);
            recyclerView.setLayoutManager(layoutManager);
            recyclerView.setHasFixedSize(true);

             button = (Button) findViewById(R.id.main_activity_button_carasoul);
             button.setOnClickListener(this);


            recyclerView.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(this, recyclerView, new GalleryAdapter.ClickListener()
            {

                @Override
                public void onClick(View view, int position) {
                    position2 = recyclerView.getChildLayoutPosition(view);
                    mAdapter.notifyDataSetChanged();


                    Intent intent = new Intent(mainActivityCarasoul.this, PDFViewerActivity.class);
                    intent.putExtra(PDFViewerActivity.TAG, books.get(position));
                    intent.putExtra("from", "mainActivityCarasoul");
                    startActivity(intent);
                }
                @Override
                public void onLongClick(View view, int position) {
                }
            }));

            recyclerView.addOnScrollListener(new CenterScrollListener());

            db = new AlbumDBHandler(this);
            getData();
        }

private void getData(){
    firebaseDatabaseInstance = FirebaseDatabase.getInstance();

    // get reference to 'users' node
    booksInstance = firebaseDatabaseInstance.getReference("mo2lfat");

    books.clear();
    books.addAll(db.getAllBook());
    mAdapter = new GalleryAdapter(getApplicationContext(), books);
    recyclerView.setAdapter(mAdapter);

    if (books.isEmpty()) {

    }

    booksInstance.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            storeData(dataSnapshot);

        }

        @Override
        public void onCancelled(DatabaseError error) {
            // Failed to read value
            Log.w(TAG, "Failed to read value.", error.toException());
        }
    });
}

private void storeData(DataSnapshot snapshot) {
    books.clear();
    for (DataSnapshot alert: snapshot.getChildren()) {
        BookData book = new BookData(
                (String)alert.child("id").getValue(),
                (String)alert.child("book_name").getValue(),
                (String)alert.child("book_path").getValue(),
                (String)alert.child("book_path").getValue(),
                "",
                (String)alert.child("image_path").getValue(),
                (String)alert.child("image_path").getValue(),
                ""
        );
        db.insertBook(book);
    }
    books.addAll(db.getAllBook());
    mAdapter.notifyDataSetChanged();
}


        @Override
        public void onClick(View v) {

           // int position3 = recyclerView.getChildLayoutPosition(v);
             Intent intent = new Intent(mainActivityCarasoul.this, PDFViewerActivity.class);
            intent.putExtra(PDFViewerActivity.TAG, books.get(position2));
            intent.putExtra("from", "mainActivityCarasoul");
            startActivity(intent);
        }

这是我的适配器类

Activity activity;
    ArrayList<BookData> images = new ArrayList<>();
    AlbumDBHandler db;
    private Context mContext;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public ImageView thumbnail;
        public TextView name;
        public Button button;

        public MyViewHolder(View view) {
            super(view);

            thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
            name = (TextView) view.findViewById(R.id.textViewGallery);
        }
    }
    public GalleryAdapter(Context context, ArrayList<BookData> images) {
        mContext = context;
        this.images = images;
        this.db = new AlbumDBHandler(context);
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.gallery_thumbnail, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {

        BookData image = images.get(position);

        if("".equals(images.get(position).getImageLocalPath())){

            Glide.with(mContext)
                    .load(images.get(position).getImagePath_2())
                    .thumbnail(0.5f)
                    .crossFade()
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .into(holder.thumbnail);

            new ImageDownloaderTask(images.get(position)).execute(images.get(position).getImagePath_2());

        }else{
            Glide.with(mContext).load(new File(images.get(position).getImageLocalPath())).into(holder.thumbnail);
        }

        holder.name.setText(images.get(position).getName());
        }

    public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {

        private GestureDetector gestureDetector;
        private GalleryAdapter.ClickListener clickListener;

        public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final GalleryAdapter.ClickListener clickListener) {
            this.clickListener = clickListener;
            gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
                @Override
                public boolean onSingleTapUp(MotionEvent e) {
                    return true;
                }

                @Override
                public void onLongPress(MotionEvent e) {
                    View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
                    if (child != null && clickListener != null) {
                        clickListener.onLongClick(child, recyclerView.getChildPosition(child));
                    }
                }
            });
        }

        @Override
        public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

            View child = rv.findChildViewUnder(e.getX(), e.getY());
            if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
                clickListener.onClick(child, rv.getChildPosition(child));
            }
            return false;
        }

        @Override
        public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

        }
    }

4 个答案:

答案 0 :(得分：1)

＃如果您的RecylcerView项目中包含Button且您希望通过点击Activity更改Button，那么您可以尝试这样：

在您的适配器onBindViewHolder()中，设置按钮onClick听众： 

@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {

    BookData image = images.get(position);

    .............
    .................
    viewHolder.button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) 
        {
             // Do somethings
        }
    });

}

＃如果您的MainActivityCarasoul有一个Button而您希望通过点击Activity更改Button，那么您可以尝试以下操作：

在MainActivityCarasoul中，执行以下更改： 

...........
.................
private int mPosition = 0; // Initialize

@Override
protected void onCreate(Bundle savedInstanceState) {
    ........
    ................
    button = (Button) findViewById(R.id.main_activity_button_carasoul);

    button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) 
        {
            // Do somethings
            Intent intent = new Intent(mainActivityCarasoul.this, PDFViewerActivity.class);
            intent.putExtra(PDFViewerActivity.TAG, books.get(mPosition));
            intent.putExtra("from", "mainActivityCarasoul");
            startActivity(intent);
        }
    });

}

<强>更新

更新position试试这个：

recyclerView.addOnItemTouchListener(new 
GalleryAdapter.RecyclerTouchListener(this, recyclerView, new GalleryAdapter.ClickListener()
    {
         @Override
         public void onClick(View view, int position) {
            mPosition = position; // update

            ..............
            ....................
    }));

希望这会有所帮助〜

答案 1 :(得分：0)

有两种方法可以做到这一点。

一个是将onclicklistener设置为回收器适配器recylers视图项视图并在那里执行您的逻辑。在那里，您可以通过viewholder.getadapterposition

访问该位置

其他方法是，如果您将click侦听器设置为recycler视图的itemtouchlistener，那么您得到的参数就是位置。你再次尝试通过调用getchildposition来获取位置

出现此错误是因为项目的父项具有linearlayout，因此传递给getchilfpositiom的视图具有linearlayout参数，这会导致无法转换为作为父项的recyclerview参数。

最好尝试使用你得到的位置。

如果您需要获取相应的适配器项，请使用一种方法来修改适配器，该方法可以调整位置并返回相应的项目。

Adapter.getItemAtPosition（位置）

如果您想获得相应的项目视图。 Recyclerview.getviewholder会有一些方法。

尝试使用回收器视图的内置函数，而不是使用视图方法。

答案 2 :(得分：0)

以下行正在抛出你提到的异常。

position2 = recyclerView.getChildLayoutPosition(view);

在这里你不需要这一行，你可以使用以下代替上述行。

position2 = position ;

我修改了你的代码，我上面提到的一个改变，还有两个你需要做的改变

  

1。注释notifyDataSetChanged（）就在下方   getChildLayoutPosition（视图）

     

2。在notifyDataSetChanged（）之前设置书籍。

以下是修改后的代码：

    FirebaseDatabase firebaseDatabaseInstance;
    private DatabaseReference booksInstance;
    AlbumDBHandler db;
    ArrayList<BookData> books = new ArrayList<>();
    private String TAG = mainActivityCarasoul.class.getSimpleName();
    private GalleryAdapter mAdapter;
    private RecyclerView recyclerView;
    private Button button;
    private int position2;

       @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main_activity_carasoul);
             final CarouselLayoutManager layoutManager = new CarouselLayoutManager(CarouselLayoutManager.HORIZONTAL, true);
            layoutManager.setPostLayoutListener(new CarouselZoomPostLayoutListener2());

            recyclerView = (RecyclerView) findViewById(R.id.recycler_view_carasoul);
            recyclerView.setLayoutManager(layoutManager);
            recyclerView.setHasFixedSize(true);

             button = (Button) findViewById(R.id.main_activity_button_carasoul);
             button.setOnClickListener(this);


            recyclerView.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(this, recyclerView, new GalleryAdapter.ClickListener()
            {

                @Override
                public void onClick(View view, int position) {
                    //position2 = recyclerView.getChildLayoutPosition(view);
                    //mAdapter.notifyDataSetChanged();
                    position2 = position ;

                    Intent intent = new Intent(mainActivityCarasoul.this, PDFViewerActivity.class);
                    intent.putExtra(PDFViewerActivity.TAG, books.get(position));
                    intent.putExtra("from", "mainActivityCarasoul");
                    startActivity(intent);
                }
                @Override
                public void onLongClick(View view, int position) {
                }
            }));

            recyclerView.addOnScrollListener(new CenterScrollListener());

            db = new AlbumDBHandler(this);
            getData();
        }

private void getData(){
    firebaseDatabaseInstance = FirebaseDatabase.getInstance();

    // get reference to 'users' node
    booksInstance = firebaseDatabaseInstance.getReference("mo2lfat");

    books.clear();
    books.addAll(db.getAllBook());
    mAdapter = new GalleryAdapter(getApplicationContext(), books);
    recyclerView.setAdapter(mAdapter);

    if (books.isEmpty()) {

    }

    booksInstance.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            storeData(dataSnapshot);

        }

        @Override
        public void onCancelled(DatabaseError error) {
            // Failed to read value
            Log.w(TAG, "Failed to read value.", error.toException());
        }
    });
}

private void storeData(DataSnapshot snapshot) {
    books.clear();
    for (DataSnapshot alert: snapshot.getChildren()) {
        BookData book = new BookData(
                (String)alert.child("id").getValue(),
                (String)alert.child("book_name").getValue(),
                (String)alert.child("book_path").getValue(),
                (String)alert.child("book_path").getValue(),
                "",
                (String)alert.child("image_path").getValue(),
                (String)alert.child("image_path").getValue(),
                ""
        );
        db.insertBook(book);
    }
    books.addAll(db.getAllBook());
    mAdapter.setBooks(books);
    mAdapter.notifyDataSetChanged();
}


        @Override
        public void onClick(View v) {

           // int position3 = recyclerView.getChildLayoutPosition(v);
             Intent intent = new Intent(mainActivityCarasoul.this, PDFViewerActivity.class);
            intent.putExtra(PDFViewerActivity.TAG, books.get(position2));
            intent.putExtra("from", "mainActivityCarasoul");
            startActivity(intent);
        }

现在在Adapter类中进行以下更改。

1。添加以下方法

public void setBooks(ArrayList<BookData> books){
  this.images = books ;

 }

现在构建您的代码并检查问题。

答案 3 :(得分：0)

有一个简单的方法可以做到这一点

itemView 是我的 ViewHolder

 private Context context;


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

                    context = itemView.getContext();
                    Intent intent = new Intent(context, yourclss.class);
                    context.startActivity(intent);


                }
            });
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