图像 Uri 到字节数组 [英] Image Uri to bytesarray

问题描述

我目前有两项活动.一种用于从 SD 卡中提取图像，一种用于蓝牙连接.

I currently have two activities. One for pulling the image from the SD card and one for Bluetooth connection.

我使用了一个 Bundle 来传输来自活动 1 的图像的 Uri.

I have utilized a Bundle to transfer the Uri of the image from activity 1.

现在我想要做的是让蓝牙活动中的 Uri 并通过字节数组将其转换为可传输状态我已经看到了一些示例，但我似乎无法让它们为我的代码工作！！

Now what i wish to do is get that Uri in the Bluetooth activity to and convert it into a transmittable state via Byte Arrays i have seen some examples but i can't seem to get them to work for my code!!

Bundle goTobluetooth = getIntent().getExtras();
    test = goTobluetooth.getString("ImageUri");

是我必须把它拉过去.下一步是什么?

is what i have to pull it across. What would be the next step?

推荐答案

从 Uri 到 byte[] 我做了以下事情，

From Uri to get byte[] I do the following things,

InputStream iStream =   getContentResolver().openInputStream(uri);
byte[] inputData = getBytes(iStream);

和 getBytes(InputStream) 方法是:

public byte[] getBytes(InputStream inputStream) throws IOException {
      ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
      int bufferSize = 1024;
      byte[] buffer = new byte[bufferSize];

      int len = 0;
      while ((len = inputStream.read(buffer)) != -1) {
        byteBuffer.write(buffer, 0, len);
      }
      return byteBuffer.toByteArray();
    }

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