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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與位圖不匹配
的編譯顯示錯誤
不兼容的類型
需要:android.graphics.Bitmap
發現:android.os.AsyncTask 「<」 java.lang.String中,空隙,機器人。 graphics.Bitmap>
Java的托架的雙碼盈不聲明
的一部分@edit謝謝FO r先前的建議我搜索並找到.get()方法 我使用任務(「」)。get()返回位圖圖像和代碼編譯沒有錯誤,但現在nothings發生時,我點擊下載圖像按鈕
閱讀此:https://developer.android.com/reference/android/os/AsyncTask.html - 示例和說明足以讓您瞭解罪魁禍首並自行修復代碼。 –