java - Cardview OnClickListener 中的图像

Question

如何在卡片 View 中的 ImageView 上插入“onclicklistener”？

上下文:我使用 ffmpeg 从视频中提取帧，并将图像显示在卡片 View 中，现在我需要设置一个 onclicklistener 来获取我单击的图像的位图。

如果我只是将 onClickListener 应用于 View ，如下所示:

view.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v) {
                // item clicked
            }
        });

它会给我我点击的正确图像位图吗？

我目前使用适配器在卡片 View 中显示图像:

Activity

public class PreviewImageActivity extends AppCompatActivity {

    private static final String FILEPATH = "filepath";
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_gallery);
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            getSupportActionBar().setDisplayShowHomeEnabled(true);
            TextView tvInstruction=(TextView)findViewById(R.id.tvInstruction) ;

            GridLayoutManager lLayoutlLayout = new GridLayoutManager(PreviewImageActivity.this, 4);
            RecyclerView rView = (RecyclerView)findViewById(R.id.recycler_view);
            rView.setHasFixedSize(true);
            rView.setLayoutManager(lLayoutlLayout);
            String filePath = getIntent().getStringExtra(FILEPATH);
            ArrayList<String> f = new ArrayList<String>();

            File dir = new File(filePath);
            tvInstruction.setText("Images stored at path "+filePath);
            File[] listFile;

                listFile = dir.listFiles();



            for(File e:listFile)
            {
                f.add(e.getAbsolutePath());
            }

            PreviewImageAdapter rcAdapter = new PreviewImageAdapter( f);
            rView.setAdapter(rcAdapter);


        }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // handle arrow click here
        if (item.getItemId() == android.R.id.home) {
            finish(); // close this activity and return to preview activity (if there is any)
        }

        return super.onOptionsItemSelected(item);
    }
}

适配器

public class PreviewImageAdapter extends RecyclerView.Adapter<PreviewImageAdapter.MyViewHolder> {

    private ArrayList<String> paths;

    public PreviewImageAdapter( ArrayList<String> paths) {
        this.paths = paths;
    }

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

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Bitmap bmp = BitmapFactory.decodeFile(paths.get(position));
        holder.ivPhoto.setImageBitmap(bmp);
    }

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

    public class MyViewHolder extends RecyclerView.ViewHolder {
        private ImageView ivPhoto;

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

            ivPhoto = (ImageView) itemView.findViewById(R.id.ivPhoto);
        }
    }

}

XML

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/card_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    card_view:cardUseCompatPadding="true"
    card_view:cardCornerRadius="@dimen/dp4"
    android:layout_margin="@dimen/dp8">
    <ImageView
        android:id="@+id/ivPhoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:scaleType="centerCrop"
      />
</android.support.v7.widget.CardView>

Answer 1

您应该在 PreviewImageAdapter onBindViewHolder 方法中添加 OnClickListener，您可以在其中访问 ImageView 。

holder.ivPhoto.setOnClickListener(new View.OnClickListener())...