Android 位图工厂在传递输入流时返回null

我使用以下代码从位图工厂获取位图，但它返回

null

InputStream stream = new ByteArrayInputStream(result.getBytes(StandardCharsets.UTF_8));
bitmap = BitmapFactory.decodeStream(stream);

我通过以下代码获得结果字符串：

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpParams httpparams = httpClient.getParams();
HttpConnectionParams.setConnectionTimeout(httpparams, 60000);
HttpConnectionParams.setSoTimeout(httpparams, 60000);

HttpPost httpPost = new HttpPost(params[0]);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
InputStream inputStream = httpEntity.getContent();

try {
    Thread.sleep(1000);
} catch (InterruptedException e) {
    e.printStackTrace();
}
/*
 * Reading the response from the Server
 */

BufferedReader reader = new BufferedReader(new InputStreamReader(
inputStream, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
    sb.append(line + "\n");
}
inputStream.close();

responseData = sb.toString();

---

BitmapFactory.decodeStream

要求传入二进制位图数据。如果输入流为

null

，或无法用于解码位图，则函数返回

null

InputStream stream = new ByteArrayInputStream(result.getBytes(StandardCharsets.UTF_8));
bitmap = BitmapFactory.decodeStream(stream);

从您的代码中可以清楚地看出，您正在将文本数据传递到

BitmapFactory

，这就是失败的原因。在将文本数据传递给

BitmapFactory

之前，必须将其解码为位图二进制数据

---

如何做到这一点取决于位图数据如何在服务器端编码成字符串。

为什么要输入这种数据？位图可以从二进制数据和代码中的UTF-8编码创建，我怀疑您正在用字符串填充它。