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public class MainActivity extends Activity {
ImageView downloadedimg;
public class ImageDownloader extends AsyncTask<String,void,Bitmap> {
@Override
protected Bitmap doInBackground(String... urls) {
try{
URL url=new URL(urls[0]);
HttpURLConnection connection=(HttpURLConnection) url.openConnection();
connection.connect();
InputStream inputStream=connection.getInputStream();
Bitmap mybitmap= BitmapFactory.decodeStream(inputStream);
return mybitmap;
}
catch(Exception e)
{
e.printStackTrace();
}
return null;
}
}
public void downloadImage(View view) {
ImageDownloader task = new ImageDownloader;
Bitmap myImage;
try {
myImage = task.execute("https://www.google.co.in/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiOw5HvydXOAhVKqo8KHYHfAtIQjRwIBw&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FBart_Simpson&psig=AFQjCNFZSwEG2tjp15Km14uuzEsmZUZ_MQ&ust=1471974330385306");
downloadedimg.setImageBitmap(myImage);
}
catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
downloadedimg=(ImageView)findViewById(R.id.imageView);
}
在行 myImage = task.execute(“some url to image address online”);task.execute url与位图不匹配
的编译显示错误
不兼容的类型
需要:android.graphics.Bitmap
发现:android.os.AsyncTask “<” java.lang.String中,空隙,机器人。 graphics.Bitmap>
Java的托架的双码盈不声明
的一部分@edit谢谢FO r先前的建议我搜索并找到.get()方法 我使用任务(“”)。get()返回位图图像和代码编译没有错误,但现在nothings发生时,我点击下载图像按钮
阅读此:https://developer.android.com/reference/android/os/AsyncTask.html - 示例和说明足以让您了解罪魁祸首并自行修复代码。 –