捕获图像并动态添加到网格视图

Question

我有一个包含网格视图的活动。在这个网格视图中，我添加了从相机捕获/从图库中获取的图像。

目前，我在 Activity 中有一个按钮，它提供了一个选择器对话框，提示用户捕获新图像或从图库中选择一个。在 onActivityResult() 中，我将这个位图添加到位图的 ArrayList 中。每次执行此操作时，都会在网格视图中添加一个新网格。

网格视图中的x个对象->用户单击按钮捕获（在活动中）->捕获位图->添加到网格视图适配器的新对象（x + 1）->捕获的图像显示在.

此代码按原样运行良好，但现在我想删除活动中的这个“按钮”并将其移动，以便当用户点击每个项目时，用户可以捕获显示在该网格上的图像。

活动

 GridItem gridItem=new GridItem();
 list = new ArrayList<>();
 list.add(gridItem); //Currently grid view has only one view
 gridViewAdapter= new GridViewAdapter(ImageGridView.this, R.layout.row_gridview, list);
 gridView.setAdapter(gridViewAdapter);

网格视图适配器

public class GridViewAdapter extends ArrayAdapter<GridItem> {

    private Context mContext;
    private int layoutResourceId;
    private ArrayList<GridItem> mGridData = new ArrayList<GridItem>();

    public GridViewAdapter(Context mContext, int layoutResourceId, ArrayList<GridItem> mGridData) {
        super(mContext, layoutResourceId, mGridData);
        this.layoutResourceId = layoutResourceId;
        this.mContext = mContext;
        this.mGridData = mGridData;
    }


    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        View row = convertView;
        final ViewHolder holder;

        if (row == null) {
            LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);
            holder = new ViewHolder();
            holder.btnAdd = (Button) row.findViewById(R.id.imgAdd);
            holder.btnRemove =(Button) row.findViewById(R.id.imgRemove);
            holder.imageView= (ImageView)row.findViewById(R.id.img);
            row.setTag(holder);
        } else {
            holder = (ViewHolder) row.getTag();
        }

       holder.btnAdd.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               //Capture an image, Display bitmap in the image view
               //Display new view as a call to action for the user to add another image
               // Disable this button so user cannot add another image to same view
               GridItem gridItem=new GridItem();
               mGridData.add(gridItem);
               notifyDataSetChanged();
           }
       });

        holder.btnRemove.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mGridData.remove(position);
                notifyDataSetChanged();
            }
        });

       return row;
    }

    static class ViewHolder {
        TextView titleTextView;
        ImageView imageView;
        Button btnAdd, btnRemove;
    }
 }

在活动中，我正在使用一个打开此对话框的按钮从活动中选择图像。一旦创建了位图，它就会被添加到GridItem object，然后添加到适配器并调用notifyDataSetChanged()。我想从本质上改变这种方法，以便用户单击每个元素/视图中的单个按钮（btnAdd）以动态添加图像。

private void selectImage() {
        final CharSequence[] items = {"Take Photo", "Choose from Gallery"};
        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
        builder.setTitle("Add picture of Prescription");
        builder.setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int item) {
                if (items[item].equals("Take Photo")) {                    
                    File f = getOutputMediaFile();
                    mUri = Uri.fromFile(f);
                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, mUri);
                    startActivityForResult(intent, Constants.REQUEST_IMAGE_CAPTURE);                    

                } else {
                    Intent intent = new Intent(
                            Intent.ACTION_PICK,
                            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                    intent.setType("image/*");
                    startActivityForResult(
                            Intent.createChooser(intent, "Select File"),
                            Constants.REQUEST_GALLERY);
            }
        });
        builder.show();
    }

我已尝试在我的网格视图的适配器内添加图像选择器对话框，但我无法创建 onActivityResult() 函数，因此我不知道如何处理选择结果。

Answer 1

这里的代码将帮助您从设备中选择任何文件，然后您可以根据需要在 onActivityResult 中执行操作。

public void browseClick() {

    Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
    intent.setType("*/*"); 
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    try {
        startActivityForResult(Intent.createChooser(intent, "Select a File to Upload"),FILE_SELECT_CODE);
    } catch (Exception ex) {
        System.out.println("browseClick :"+ex);
    }
}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
     if (requestCode == FILE_SELECT_CODE) {
            if (resultCode == RESULT_OK) {
                try {
                    String newName = "", filename = "";
                    int filesize = 0;
                    Uri uri = data.getData();
                    if (filesize >= FILE_SIZE_LIMIT) {
                        Toast.makeText(
                                this,
                                "The selected file is too large. Selet a new file with size less than 2mb",
                                Toast.LENGTH_LONG).show();
                    } else {
                        String mimeType = getContentResolver().getType(uri);
                        if (mimeType == null) {
                            String path = getPath(this, uri);
                            if (path == null) {
                                filename = FilenameUtils
                                        .getName(uri.toString());
                            } else {
                                File file = new File(path);
                                filename = file.getName();
                            }
                        } else {
                            Uri returnUri = data.getData();
                            Cursor returnCursor = getContentResolver().query(
                                    returnUri, null, null, null, null);
                            int nameIndex = returnCursor
                                    .getColumnIndex(OpenableColumns.DISPLAY_NAME);
                            int sizeIndex = returnCursor
                                    .getColumnIndex(OpenableColumns.SIZE);
                            returnCursor.moveToFirst();
                            filename = returnCursor.getString(nameIndex);
                            String size = Long.toString(returnCursor
                                    .getLong(sizeIndex));
                        }


                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
}

您可以使用“intent.setType()”方法设置要选择的文件类型。