保存从图库中挑选的图像以备将来使用 [英] saving image picked from gallery for future use

问题描述

嘿，我已经找了一段时间了.以下代码从 android 库中选取图像并将其显示在 imageView 中.但事情就是这样，每次关闭并重新启动应用程序时，都必须再次选择.我想知道如何编辑以下内容以在 imageView 中永久保存图像.

Hey i have been looking for a while now. the following code picks the image from the android gallery and shows it in an imageView. but heres the thing, everytime the app is closed and restarted the has to be picked again. i would like to know how i can edit the following to save the image for good in the imageView.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        ImageView imageView = (ImageView) findViewById(R.id.imgView);
        imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

    }


}

推荐答案

用户唯一选择的是图片的路径.因此，如果您将路径保存到 SharedPreferences，那么每次应用程序启动时，您都可以使用现有代码，但只需更改获取路径的位置:

The only thing that the user is picking is the path of the picture. So if you save the path to SharedPreferences, then everytime the app is started, you can use your existing code, but just change where you get the path:

String picturePath = PreferenceManager.getDefaultSharedPreferences(this).getString("picturePath", "");
if(!picturePath.equals(""))
{
   ImageView imageView = (ImageView) findViewById(R.id.imgView);
   imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}

这是您可以在 OnCreate 中使用的完整方法:

This is a complete method you can use in OnCreate:

String picturePath = PreferenceManager.getDefaultSharedPreferences(this).getString("picturePath", "");
if(!picturePath.equals(""))
{
   ImageView imageView = (ImageView) findViewById(R.id.imgView);
   imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
else {
   selectImage();
}

在选择图像中使用您当前的代码来启动采摘活动，然后在 onActivityResult 中使用:

In select image use your current code to start the picking activity, then in onActivityResult use this:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        PreferenceManager.getDefaultSharedPreferences(this).edit().putString("picturePath", picturePath).commit();
        cursor.close();

        ImageView imageView = (ImageView) findViewById(R.id.imgView);
        imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

    }

这篇关于保存从图库中挑选的图像以备将来使用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！