Question

我试图制作一种图像日记，用图像创建帖子。首先我遇到的问题是每个帖子都显示相同的图像，但尝试用File.createTempFile修复它。但是现在什么都没有显示，我得到了很多空指针异常。

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
    /**
     *Gets the images taken with the camera, depended on how many pictures were taken, they are saved in images.
     **/
    if (requestCode == CAMERA_REQUEST && resultCode == this.getActivity().RESULT_OK && counter <= 2) {
        Bitmap bmp = (Bitmap) data.getExtras().get("data");


        switch (counter) {
            case 0:
                im1.setVisibility(View.VISIBLE);
                im1.setImageBitmap(bmp);
                Log.d(this.getActivity().getPackageName(), bmp != null ? "bmp is not null!" : "bmp is null!");
                images.add(saveToInternalStorage(bmp));



                counter++;
                break;
            case 1:
                im2.setVisibility(View.VISIBLE);
                im2.setImageBitmap(bmp);
                //pathList.add(1,saveToInternalStorage(bmp));
                images.add(saveToInternalStorage(bmp));

                counter++;

                break;
            case 2:
                im3.setVisibility(View.VISIBLE);
                im3.setImageBitmap(bmp);
                images.add(saveToInternalStorage(bmp));

                counter++;
                break;
        }

...

     private String saveToInternalStorage(Bitmap bitmapImage) {
    ContextWrapper cw = new ContextWrapper(this.getActivity().getApplicationContext());
    // path to /data/data/yourapp/app_data/imageDir
    File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
    // Create imageDir
    File mypath = null;
    try {
        mypath = File.createTempFile("image", ".jpg", directory);
    } catch (IOException e) {
        e.printStackTrace();
    }

    FileOutputStream fos = null;
    try {

        fos = new FileOutputStream(mypath);

        // Use the compress method on the BitMap object to write image to the OutputStream
        bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
        fos.close();
    } catch (Exception e) {
        e.printStackTrace();
    }


    return directory.getAbsolutePath();
}

...在我的适配器中

    private Bitmap loadImageFromStorage(String path) {
    Bitmap b = null;
    File f= null;

    try {
        f =  new File(path);
        b = BitmapFactory.decodeStream(new FileInputStream(f));
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    return b;
}

更新了上面的代码，但没有我得到这个例外。我想也许错误是在File.createTempFile保存图像时，加载函数再次获取图像，这可能是我错过的东西吗？

修复了异常，但我仍然没有获得图片

Answer 1

在 loadImageFromStorage（String path，int i）方法中线

String name = p.getImageNames().get(i);

给出错误，确保您在实例变量p上设置了arraylist，然后尝试获取该列表。

图片不会显示在ListView

1 个答案: