从Android中的httpResponse获取图像内容

我试图从http响应中获取图像,但无法将流转换为位图.
请让我知道,我在这里失踪了什么.

仅供参考 – 图像内容以原始二进制形式接收.它是一个jpeg图像.

程序如下：

>制作HttpRequest.
>作为响应检查200 – >获取httpentity内容.
>使用BitMap工厂将流转换为位图.
>将位图设置为imageview

在postExecute的AsyncTask中执行此操作

    HttpClient httpclient = new DefaultHttpClient();
    HttpGet httpget = new HttpGet(endpoint);
    // Adding Headers .. 
    // Execute the request
    HttpResponse response;
    try {
        response = httpclient.execute(httpget);
    if (response.getStatusLine().getStatusCode() == 200) {
        // Get hold of the response entity
        HttpEntity entity = response.getEntity();
        if (entity != null) {
        InputStream instream = entity.getContent();
        return instream;
        // instream.close();
            }
    }
}

在postExecute的AsyncTask中执行此操作

    if (null != instream) {
        Bitmap bm = BitmapFactory.decodeStream(instream);
        if(null == bm){
    Toast toast = Toast.makeText(getApplicationContext(),
        "Bitmap is NULL", Toast.LENGTH_SHORT);
            toast.show();
    }
        ImageView view = (ImageView) findViewById(R.id.picture_frame);
    view.setImageBitmap(bm);
    }

提前致谢.

解决方法:

终于找到了答案.下面是片段 – 可能有助于使用http响应的新手.

HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(endpoint);
// Adding Headers .. 
// Execute the request
HttpResponse response;
try {
    response = httpclient.execute(httpget);
if (response.getStatusLine().getStatusCode() == 200) {
    // Get hold of the response entity
    HttpEntity entity = response.getEntity();
    if (entity != null) {
    InputStream instream = entity.getContent();
    String path = "/storage/emulated/0/YOURAPPFOLDER/FILENAME.EXTENSION";
    FileOutputStream output = new FileOutputStream(path);
    int bufferSize = 1024;
    byte[] buffer = new byte[bufferSize];
    int len = 0;
    while ((len = instream.read(buffer)) != -1) {
        output.write(buffer, 0, len);
    }
    output.close();
}

我们可以将内容保存在bytearray中并从中获取位图,而不是将文件保存到磁盘.

ByteArrayOutputStream baos = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
try {
    // instream is content got from httpentity.getContent()
    while ((len = instream.read(buffer)) != -1) {
    baos.write(buffer, 0, len);
    }
    baos.close();
} catch (IOException e) {
    e.printStackTrace();
}
byte[] b = baos.toByteArray();
Bitmap bmp = BitmapFactory.decodeByteArray(b, 0, b.length);
ImageView imageView = (ImageView)findViewById(R.id.picture_frame);
imageView.setImageBitmap(bmp);

仅供参考 – 在android fileoutput流中,写入本地磁盘必须在非UI线程中完成(在我的情况下使用了异步任务,并且此处未添加该部分).

谢谢 ..

标签：android,inputstream,bitmap,httpresponse,httpentity
来源： https://codeday.me/bug/20190825/1716787.html