23_传智播客Android视频教程_网络通信之网络图片查看器

布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView              android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="网络图片的地址是：\n 这个可以自定在输入框里面输入，但是为了简便，直接使用TextView做了" />    <Button        android:id="@+id/Button01"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:text="得到网络图片" />        <ImageView        android:id="@+id/imageView01"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></LinearLayout>

MainActivity：

public class MainActivity extends Activity {private Button Button01;private ImageView imageView01;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button01 = (Button) findViewById(R.id.Button01);imageView01 = (ImageView) findViewById(R.id.imageView01);Button01.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String path = "http://111.114.116.236:8080/Test/image/Test.jpg";try {byte[] data = ImageService.getImageByByte(path);Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,data.length);imageView01.setImageBitmap(bitmap);} catch (Exception e) {e.printStackTrace();}}});}}

ImageService：

public class ImageService {public static byte[] getImageByByte(String path) throws Exception {ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();URL url = new URL(path);// HttpClientConnection 是对HttpURLConnection的封装，不建议使用/*HttpsURLConnection与HttpURLConnection就是http与https的区别 *  */HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();httpURLConnection.setConnectTimeout(5000);httpURLConnection.setRequestMethod("GET");if (httpURLConnection.getResponseCode() == 200) {InputStream inputStream = httpURLConnection.getInputStream();byte[] buffer = new byte[1024];int len = 0;// 读到buffer中间while ((len = inputStream.read(buffer)) != -1) {// 从buffer中读数据byteArrayOutputStream.write(buffer, 0, len);}inputStream.close();}return byteArrayOutputStream.toByteArray();}}

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