MyImageView帮助类
import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.widget.ImageView; import android.widget.Toast; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; public class MyImageView extends ImageView { public static final int GET_DATA_SUCCESS = 1; public static final int NETWORK_ERROR = 2; public static final int SERVER_ERROR = 3; //子线程不能操作UI,通过Handler设置图片 private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what){ case GET_DATA_SUCCESS: Bitmap bitmap = (Bitmap) msg.obj; setImageBitmap(bitmap); break; case NETWORK_ERROR: Toast.makeText(getContext(),"网络连接失败",Toast.LENGTH_SHORT).show(); break; case SERVER_ERROR: Toast.makeText(getContext(),"服务器发生错误",Toast.LENGTH_SHORT).show(); break; } } }; public MyImageView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public MyImageView(Context context) { super(context); } public MyImageView(Context context, AttributeSet attrs) { super(context, attrs); } //设置网络图片 public void setImageURL(final String path) { //开启一个线程用于联网 new Thread() { @Override public void run() { try { //把传过来的路径转成URL URL url = new URL(path); //获取连接 HttpURLConnection connection = (HttpURLConnection) url.openConnection(); //使用GET方法访问网络 connection.setRequestMethod("GET"); //超时时间为10秒 connection.setConnectTimeout(10000); //获取返回码 int code = connection.getResponseCode(); if (code == 200) { InputStream inputStream = connection.getInputStream(); //使用工厂把网络的输入流生产Bitmap Bitmap bitmap = BitmapFactory.decodeStream(inputStream); //利用Message把图片发给Handler Message msg = Message.obtain(); msg.obj = bitmap; msg.what = GET_DATA_SUCCESS; handler.sendMessage(msg); inputStream.close(); }else { //服务启发生错误 handler.sendEmptyMessage(SERVER_ERROR); } } catch (IOException e) { e.printStackTrace(); //网络连接错误 handler.sendEmptyMessage(NETWORK_ERROR); } } }.start(); } }
布局
<MyImageView android:id="@+id/head" android:layout_width="130dp" android:layout_height="130dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.148" app:srcCompat="@drawable/head" />
注意:标签名为帮助类的名字或者(包名.类名)
调用:
MyImageView myImageView = MyImageView)root.findViewById(R.id.head); myImageView.setImageURL(root.getContext().getString( "网络图片地址");