Question

您好我遇到了一点问题。我找不到一个允许我加载所有内容的工作示例从一个文件夹到网格视图的图像。我有一个工作的网格视图，但我必须通过带有R.drawable.theImageName的int数组加载图像我需要的是一个功能，可以将所有图像加载到网格，而无需知道图像的名称。我已按照本教程创建网格视图http://www.youtube.com/watch?v=Y75i3U7X-ng

Tnx的帮助如果我忘了一些东西，我对应用程序编程操作系统有点新，请告诉我，我会尝试粘贴代码。

GridView gv = (GridView) findViewById(R.id.car_gridView);
    gv.setAdapter(new CarImageAdapter(getApplicationContext()));

private Context context;
public CarImageAdapter(Context applicationContext) {
        // TODO Auto-generated constructor stub
        context = applicationContext;
    }

    public View getView(int position, View contentView, ViewGroup parrent) {
    // TODO Auto-generated method stub
    ImageView iv;
    if(contentView != null)
    {
        iv = (ImageView) contentView;
    }
    else
    {
        iv = new ImageView(context);
        iv.setLayoutParams(new GridView.LayoutParams(300, 300));
        iv.setScaleType(ScaleType.CENTER_CROP);
        iv.setPadding(8, 8, 8, 8);

    }

    iv.setImageResource(car_images[position]);  
    return iv;
}

我用它来创建和保存图像。

    public void captureImage()
{
    ImageView imageView = (ImageView) findViewById(R.id.img_resultimage);

    root = Environment.getExternalStorageDirectory().toString() + "/Upgrade_rim";
    imageFolderPath = root + "/car_images";
    File imagesFolder = new File(imageFolderPath);
    imagesFolder.mkdirs();


    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    imageName = "car_"+timeStamp +".png";


    File image = new File(imageFolderPath, imageName);
    fileUri = Uri.fromFile(image);
    imageView.setTag(imagesFolder + File.separator + imageName);
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
    startActivityForResult(takePictureIntent, CAMERA_IMAGE_REQUEST);

}

Answer 1

我列出了存储在sdcard根文件夹中的所有png文件。我用PDF文件成功完成了这项工作。

public class Sdcard_pdf_list extends ListActivity { String[] pdflist; File[] imagelist; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); File images = Environment.getExternalStorageDirectory(); imagelist = images.listFiles(new FilenameFilter() { public boolean accept(File dir, String name) { return ((name.endsWith(".png"))); } }); pdflist = new String[imagelist.length]; for (int i = 0; i < imagelist.length; i++) { pdflist[i] = imagelist[i].getName(); } this.setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, pdflist)); } }

如果您有任何疑问，请填写免费通知。

Answer 2

一种选择是使用Assets文件夹。

将所有图片放在一个文件夹中，在资产文件夹中说“产品”。

我使用ImageView来显示图像。您可以相应地将其更改为gridview。

你走了：

public class Assets_Folder_Img extends Activity 
{

    ArrayList<String> arr_Img = new ArrayList<String>();
    String ASSET_FOLDER_NAME="products";
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_assets__folder__img);

        get_images_in_List(ASSET_FOLDER_NAME);
        setImages();
    }

    void setImages()
    {

        InputStream is = null;

        for(int i=0;i<arr_Img.size();i++)
        {
            try 
            {
                is = getAssets().open(ASSET_FOLDER_NAME+"/" +arr_Img.get(i));
            } 
            catch (IOException e) 
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            Bitmap bit = BitmapFactory.decodeStream(is);

            LinearLayout ll = (LinearLayout)findViewById(R.id.root);

                ImageView image = new ImageView(this);
                image.setLayoutParams(new android.view.ViewGroup.LayoutParams(120,120));
                image.setImageBitmap(bit);
                ll.addView(image);

        }
    }

     private void get_images_in_List(String folderName) 
        {
            try 
            {
                String [] list = getAssets().list(folderName);

                    arr_Img.addAll(Arrays.asList(list));
                    Log.e("log", "size is "+arr_Img.size());
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            }

        }
}

将图像放入资源仅适用于少量图像存储。否则会给应用程序带来负担。

将图像从文件夹路径加载到网格视图，Android

2 个答案: