①首先要访问互联网那么就要加访问互联网的权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
②访问互联网其实就是一种流的交换，当点击看出按钮的时候那么程序就是将输入流转换为输出流
代码：
private final class BtnListener implements OnClickListener{
@Override
public void onClick(View arg0) {
byte[] date;
String path=pathEditText.getText().toString();
ImageService service=new ImageService();
try {
date =service.seePic(path);
Bitmap bitmap=BitmapFactory.decodeByteArray(date, 0, date.length);
imageView.setImageBitmap(bitmap);
} catch (IOException e) {
Toast.makeText(ImageViewActivity.this, "图片加载失败", 1).show();
e.printStackTrace();
}
}
}
ImageService service=new ImageService();
date =service.seePic(path);
public byte[] seePic(String path) throws IOException {
URL url=new URL(path);
HttpURLConnection con=(HttpURLConnection)url.openConnection();
con.setConnectTimeout(5000);
con.setRequestMethod("GET");
byte[] data=null;
if(con.getResponseCode()==200){
InputStream inputStream=con.getInputStream();
data = Utils.read(inputStream);
return data;
}
return null;
}
其中：utli
public static byte[] read(InputStream inputStream) throws IOException {
byte[] buffer=new byte[1024];
ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
int len=0;
while((len=inputStream.read(buffer))!=-1){
byteArrayOutputStream.write(buffer, 0, len);//将读到的二进制文件写到内存中
}
inputStream.close();
return byteArrayOutputStream.toByteArray();
}
效果图：
