一、获取网络图片URL
1.随便找一张网络图片
2.右键打开图像
3.复制图片URL （.jpg或者其他图像格式结尾的url才是图片的url(统一资源定位器)啊 =>=)
二、代码
1.初始化绑定视图
private Bitmap imgBitmap = null;private ImageView ivPhoto;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ivPhoto = (ImageView) findViewById(R.id.photo);String imgUrl = "/full/l3/wallhaven-l3xk6q.jpg";requestWebPhotoBitmap(imgUrl);}
2.网络请求（核心代码）
（方法一 ：通过 HttpURLConnection 请求）
/*** 通过 网络图片 url 获取图片 Bitmap* @param photoUrl 网络图片 url*/private void requestWebPhotoBitmap(String photoUrl) {new Thread(() -> {HttpURLConnection connection = null;try {URL bitmapUrl = new URL(photoUrl);connection = (HttpURLConnection) bitmapUrl.openConnection();connection.setRequestMethod("GET");connection.setConnectTimeout(5000);connection.setReadTimeout(5000);// 判断是否请求成功if (connection.getResponseCode() == 200) {Message hintMessage = new Message();hintMessage.what = HANDLER_START_DOWNLOAD;hintHandler.sendMessage(hintMessage);InputStream inputStream = connection.getInputStream();imgBitmap = BitmapFactory.decodeStream(inputStream);Message message = showHandler.obtainMessage();showHandler.sendMessage(message);} else {Message hintMessage = new Message();hintMessage.what = HANDLER_NET_ERROR;hintHandler.sendMessage(hintMessage);}} catch (IOException e) {e.printStackTrace();} finally {if (connection != null) connection.disconnect();}}).start();}/*** 设置提示*/private final Handler hintHandler = new Handler(Looper.getMainLooper()){@Overridepublic void handleMessage(Message msg) {if(msg.what == HANDLER_START_DOWNLOAD)Toast.makeText(MainActivity.this, "获取图片中，请稍等", Toast.LENGTH_SHORT).show();else if(msg.what == HANDLER_NET_ERROR)Toast.makeText(MainActivity.this, "网络错误，请重试", Toast.LENGTH_SHORT).show();}};/*** 展示图片*/@SuppressLint("HandlerLeak")private final Handler showHandler = new Handler(Looper.getMainLooper()) {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);ivPhoto.setImageBitmap(imgBitmap); //填充控件}};
（方法二 ： 通过 Glide）
/*** 获取 网络图片 Bitmap* @param imgUrl 网络图片url*/private void requestWebPhotoBitmap(String imgUrl) {Toast.makeText(MainActivity.this, "获取图片中，请稍等", Toast.LENGTH_SHORT).show();Glide.with(MainActivity.this).asBitmap().load(imgUrl).into(new CustomTarget<Bitmap>() {@SuppressLint("ClickableViewAccessibility")@Overridepublic void onResourceReady(@NonNull Bitmap resource, @Nullable Transition<? super Bitmap> transition) {imgBitmap = resource;ivPhoto.setImageBitmap(imgBitmap)}@Overridepublic void onLoadCleared(@Nullable Drawable placeholder) {}});}
注意：使用 glide 要在 build.gradle（app）导包
implementation 'com.github.bumptech.glide:glide:4.11.0'
3.布局文件
<?xml version="1.0" encoding="utf-8"?><FrameLayoutxmlns:android="/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:layout_gravity="center" ><ImageViewandroid:id="@+id/photo"android:layout_width="match_parent"android:layout_height="500dp"android:layout_gravity="center"android:scaleType="centerInside" ></ImageView></FrameLayout>
