android 如何将位图中的图像保存在外部存储器中

Question

我正在使用 ACTION_IMAGE_CAPTURE 使用相机拍摄图像。它工作正常，但问题是图像在单击后显示在 imageview 中，但无法保存在外部或内部存储中。这是我在外部存储中保存图像的代码。

Bitmap bitmap = (Bitmap) data.getExtras().get("data");
        File file = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/DashBoard/");
        file.mkdirs();
        ticket = Environment.getExternalStorageDirectory().getAbsolutePath() + "/DashBoard/Ticket.jpg";
        file4 = new File(file, ticket);
        try {
            FileOutputStream out = new FileOutputStream(file4);
            bitmap.compress(Bitmap.CompressFormat.JPEG , 90, out);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        ivTicket.setImageBitmap(bitmap);

有什么解决办法吗？

Answer 1

关注它 -

private void SaveImage(Bitmap finalBitmap) {

    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/saved_images");    
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ())
      file.delete (); 
    try {
        FileOutputStream out = new FileOutputStream(file);
        finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();

    } catch (Exception e) {
         e.printStackTrace();
    }
}

并将其添加到清单中

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

编辑： 通过使用这一行，您将能够在画廊视图中看到保存的图像。

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
                         Uri.parse("file://" + Environment.getExternalStorageDirectory())));

Reference

Answer 2

试试这个：

private void SaveImage(Bitmap finalBitmap) {
 String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");    
 myDir.mkdirs();
 Random generator = new Random();
 int n = 10000;
 n = generator.nextInt(n);
 String fname = "Image-"+ n +".jpg";
 File file = new File (myDir, fname);
 if (file.exists ()) file.delete (); 
 try {
   FileOutputStream out = new FileOutputStream(file);
   finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
   out.flush();
   out.close();

} catch (Exception e) {
   e.printStackTrace();
}
}

并将其添加到清单中

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

另一个例子here

Answer 3

使用 ImageWorker 库轻松保存 bitmaps/drawables/base64。

如何保存

ImageWorker.to(context).
    directory("ImageWorker").
    subDirectory("SubDirectory").
    setFileName("Image").
    withExtension(Extension.PNG).
    save(sourceBitmap,85)

就这么简单。欢迎投稿。

android 如何将位图中的图像保存在外部存储器中

How to save image in external storage from bitmap in android

storage

android

bitmap