如何在Android 中的共享首选项中保存图像|Android 中的共享偏好问题与图像 [英] How to save Image in shared preference in Android | Shared preference issue in Android with Image

问题描述

在我登录后的应用程序中，我必须在其他页面的共享首选项中保存用户名和图像.我可以优先保存名称，但找不到任何保存图像的位置.

In my application after login I have to save user name and image in shared preference for other pages. I am able to save name in preference but can't get any where how to save image.

我正在尝试类似的东西-

I am trying something like that-

SharedPreferences myPrefrence;
    String namePreferance="name";

    String imagePreferance="image";

SharedPreferences.Editor editor = myPrefrence.edit();
                editor.putString("namePreferance", itemNAme);
                editor.putString("imagePreferance", itemImagePreferance);
                editor.commit();

我试图将图像转换为对象后将其保存为字符串.但是当我将它重新转换为位图时，我什么也没得到.

I am trying to save image as string after convert it into object. But when I reconvert it into bitmap I did not get anything.

推荐答案

我解决了您的问题，请执行以下操作:

I solved your problem do something like that:

1. 写入方法将您的位图编码为字符串 base64-

1. Write Method to encode your bitmap into string base64-

// method for bitmap to base64
public static String encodeTobase64(Bitmap image) {
    Bitmap immage = image;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    immage.compress(Bitmap.CompressFormat.PNG, 100, baos);
    byte[] b = baos.toByteArray();
    String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);

    Log.d("Image Log:", imageEncoded);
    return imageEncoded;
}

在这个方法中传递你的位图，就像你喜欢的东西一样:

Pass your bitmap inside this method like something in your preference:

SharedPreferences.Editor editor = myPrefrence.edit();
editor.putString("namePreferance", itemNAme);
editor.putString("imagePreferance", encodeTobase64(yourbitmap));
editor.commit();

如果您想在任何地方显示您的图像，请使用解码方法再次将其转换为位图:

And when you want to display your image just anywhere, convert it into a bitmap again using the decode method:

// method for base64 to bitmap
public static Bitmap decodeBase64(String input) {
    byte[] decodedByte = Base64.decode(input, 0);
    return BitmapFactory
            .decodeByteArray(decodedByte, 0, decodedByte.length);
}

请在此方法中传递您的字符串并执行您想要的操作.

Please pass your string inside this method and do what you want.

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