Question

嘿，我一直在寻找一段时间。以下代码从android库中选择图像并在imageView中显示。但事实上，只要应用程序关闭并重新启动，就必须再次选择。我想知道如何编辑以下内容以在imageView中保存图像。

@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));

    }


}

Answer 1

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，那么每次启动应用程序时，您都可以使用现有代码，但只需更改获取路径的位置：

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

编辑：这是一个可以在OnCreate中使用的完整方法：

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

在选择图片中使用当前代码开始拣货活动，然后在onActivityResult中使用：

@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));

    }

保存从图库中选取的图像以备将来使用

1 个答案: