将图像从 Android 上的可绘制资源保存到 sdcard [英] Save image to sdcard from drawable resource on Android

问题描述

我想知道如何通过单击按钮将图像保存到用户的 SD 卡中.有人可以告诉我如何做到这一点.图像为 .png 格式，并存储在 drawable 目录中.我想编写一个按钮来将该图像保存到用户的 SD 卡中.

I'm wondering how to save an image to user's sdcard through a button click. Could some one show me how to do it. The Image is in .png format and it is stored in the drawable directory. I want to program a button to save that image to the user's sdcard.

推荐答案

此处描述了保存文件(在您的情况下为图像)的过程:save-file-to-sd-card

The process of saving a file (which is image in your case) is described here: save-file-to-sd-card

假设您的 drawable 中有一个名为 ic_launcher 的图像.然后从此图像中获取位图对象，例如:

Say you have an image namely ic_launcher in your drawable. Then get a bitmap object from this image like:

Bitmap bm = BitmapFactory.decodeResource( getResources(), R.drawable.ic_launcher);

可以使用以下方法检索 SD 卡的路径:

The path to SD Card can be retrieved using:

String extStorageDirectory = Environment.getExternalStorageDirectory().toString();

然后使用以下按钮保存到sdcard:

Then save to sdcard on button click using:

File file = new File(extStorageDirectory, "ic_launcher.PNG");
    FileOutputStream outStream = new FileOutputStream(file);
    bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
    outStream.flush();
    outStream.close();

不要忘记添加android.permission.WRITE_EXTERNAL_STORAGE权限.

这是用于从 drawable 保存的修改文件:SaveToSd，一个完整的示例项目:SaveImage

Here is the modified file for saving from drawable: SaveToSd , a complete sample project: SaveImage

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