Android學習_uri轉byte

在進行圖片的處理時，常常會遇到需要將手機內圖片(照片)轉成byte再傳出去(例如facebook的圖片上傳)。

步驟：
1. 將uri傳成inputstream

ContentResolver resolver = getContentResolver();
resolver.openInputStream(uri);

*20120604補充第一步驟程式碼：
byte[] buffer;
ContentResolver resolver = getContentResolver();
buffer = readStream(resolver.openInputStream(Uri.parse(Picuri.toString())));

2. 將inputstream轉成byte[]

public static byte[] readStream(InputStream inStream) throws Exception {
byte[] buffer = new byte[1024];
int len = -1;
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
byte[] data = outStream.toByteArray();
outStream.close();
inStream.close();
return data;
}

接著，就可以將byte[]擺放傳入自己或別人的方法中，完成圖片的傳遞。