Question

我正在尝试使用url下载图像并将其设置为TextView背景。

    Bitmap bmImg;
URL myfileurl =null;
try{
    myfileurl= new URL("https://www.vegetables.co.nz/assets/vegetables/_resampled/FillWyI0MDAiLCIzMDAiXQ/carrots.png");
}
catch (MalformedURLException e){
    e.printStackTrace();
}

try{
    HttpURLConnection conn= (HttpURLConnection)myfileurl.openConnection();
    conn.setDoInput(true);

    conn.connect();
    InputStream is = conn.getInputStream();
    BitmapFactory.Options options = new BitmapFactory.Options();

    bmImg = BitmapFactory.decodeStream(is,null,options);
    Drawable dr = new BitmapDrawable(bmImg);
    tv.setBackgroundDrawable(dr);
    tv.setImageBitmap(bmImg);
}
catch(IOException e){
    // TODO Auto-generated catch block
    e.printStackTrace();
    Toast.makeText(PhotoRating.this, "Connection Problem. Try Again.", Toast.LENGTH_SHORT).show();
}

我收到错误->

AndroidRuntime：致命异常：主要流程：com.example.android.architecture.blueprints.tododatabinding.mock，PID： 20288 android.os.NetworkOnMainThreadException 在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork（StrictMode.java:1303）在java.net.Inet6AddressImpl.lookupHostByName（Inet6AddressImpl.java:86）在java.net.Inet6AddressImpl.lookupAllHostAddr（Inet6AddressImpl.java:74）在java.net.InetAddress.getAllByName（InetAddress.java:752）在com.android.okhttp.internal.Network $ 1.resolveInetAddresses（Network.java:29）在com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress（RouteSelector.java:209）在com.android.okhttp.internal.http.RouteSelector.nextProxy（RouteSelector.java:163）在com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:105）在com.android.okhttp.internal.http.HttpEngine.createNextConnection（HttpEngine.java:489）在com.android.okhttp.internal.http.HttpEngine.connect（HttpEngine.java:465）在com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:371）在com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute（HttpURLConnectionImpl.java:503）在com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect（HttpURLConnectionImpl.java:130）在com.example.android.architecture.blueprints.todoapp.productlist.ProductlistFragment $ 2.getView（ProductlistFragment.java:200）在android.widget.AbsListView.obtainView（AbsListView.java:3170）在android.widget.GridView.onMeasure（GridView.java:1104）

我在INTERNET Permission文件中提供了Manifest.xml。我不知道错误是什么。

选项2：

我也尝试过Picasso，将依赖项compile com.squareup.picasso:picasso:2.4.0添加到app / build.gradle

TextView tv = (TextView) findViewById(R.id.textView1);
Picasso.with(this)                        .load("https://www.vegetables.co.nz/assets/vegetables/_resampled/FillWyI0MDAiLCIzMDAiXQ/carrots.png").into(tv);

它显示

cannot find symbol variable Picasso

使用URL将图像加载到TextView

0 个答案: