android 获取网络上服务器图片

layout文件<?xml version="1.0" encoding="utf-8"?>

class

public class showpage extends AppCompatActivity {    private String picture_String;    private ImageView Image_license;    private Bitmap img;    private ProgressDialog progressDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_showpage);        Image_license = (ImageView) findViewById(R.id.Image_license);        Intent intent = new Intent();        Bundle bundle = intent.getExtras();        picture_String = bundle.getString("license");        new DownloadImage().execute();    }    private Bitmap bitmap;    class DownloadImage extends AsyncTask {            @Override        protected Object doInBackground(String... string) {            try {                String PATH = "网络上照片的地址";                URL url = new URL(picture_String);                // 打开一个连接                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();                httpURLConnection.setConnectTimeout(5000);                httpURLConnection.setRequestMethod("GET");                if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {                    // 得到服务器返回过来的流对象                    InputStream inputStream = httpURLConnection.getInputStream();                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);                    return bitmap;                }            } catch (Exception e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onProgressUpdate(Void... values) {            super.onProgressUpdate(values);        }        @Override        protected void onPostExecute(Object object) {            super.onPostExecute(object);            if (object != null) {                bitmap = (Bitmap) object;                new Handler().postDelayed(new Runnable() {                    @Override                    public void run() {                        Image_license.setImageBitmap(bitmap);                    }                }, 2000);            } else {                //失败                Toast.makeText(showpage.this, "下载失败", Toast.LENGTH_LONG).show();            }        }    }}

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