由网友(叹一曲悠悠)分享简介:我是用这个,来显示图像从互联网但它抛出一个错误如下:04-12 13:45:05.337:E / AndroidRuntime(27897):android.view.ViewRootImpl $ CalledFromWrongThreadException:所致。只有创建视图层次可以触摸其观点原来的线程 公共类订单扩...![Android View源码解读 浅谈DecorView与ViewRootImpl](/d/file/2023/09-17/7e2cee8b2dee31b6300dc310af358f7c.png)
我是用这个,来显示图像从互联网但它抛出一个错误如下: 04-12 13:45:05.337:E / AndroidRuntime(27897):android.view.ViewRootImpl $ CalledFromWrongThreadException:所致。只有创建视图层次可以触摸其观点原来的线程
公共类订单扩展活动{
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
新DownloadFilesTask()执行()。
}
私有类DownloadFilesTask扩展的AsyncTask<虚空,虚空,虚空> {
保护无效onPostExecute(无效的结果){
}
@覆盖
保护无效doInBackground(虚空...... PARAMS){
的setContentView(R.layout.order);
ImageView的ImageView的=(ImageView的)findViewById(R.id.imgView);
imageView.setImageDrawable(createDrawableFromURL(http://savagelook.com/misc/sl_drop2.png));
返回null;
}
}
私人绘制对象createDrawableFromURL(字符串urlString){
绘制的图像= NULL;
尝试 {
网址URL =新的URL(urlString);
InputStream的是=(的InputStream)url.getContent();
图像= Drawable.createFromStream(是,SRC);
}赶上(MalformedURLException异常E){
图像= NULL;
}赶上(IOException异常E){
图像= NULL;
}
返回形象;
}
}
解决方案
将这个在的onCreate()
的ImageView ImageView的;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.order);
ImageView的=(ImageView的)findViewById(R.id.imgView);
新DownloadFilesTask()执行()。
}
和您的的AsyncTask
类应该是这样的,
私有类DownloadFilesTask扩展的AsyncTask<虚空,虚空,虚空> {
绘制对象绘制;
@覆盖
保护无效doInBackground(虚空...... PARAMS){
绘制= createDrawableFromURL(
http://savagelook.com/misc/sl_drop2.png);
返回null;
}
保护无效onPostExecute(无效的结果){
imageView.setImageDrawable(绘制);
}
}
![Android View源码解读 浅谈DecorView与ViewRootImpl](/d/file/2023/09-17/7e2cee8b2dee31b6300dc310af358f7c.png)
I was using this, to DISPLAY IMAGES FROM THE INTERNET but it throws an error as below: 04-12 13:45:05.337: E/AndroidRuntime(27897): Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
public class Order extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new DownloadFilesTask().execute();
}
private class DownloadFilesTask extends AsyncTask<Void, Void, Void> {
protected void onPostExecute(Void result) {
}
@Override
protected Void doInBackground(Void... params) {
setContentView(R.layout.order);
ImageView imageView = (ImageView)findViewById(R.id.imgView);
imageView.setImageDrawable(createDrawableFromURL("http://savagelook.com/misc/sl_drop2.png"));
return null;
}
}
private Drawable createDrawableFromURL(String urlString) {
Drawable image = null;
try {
URL url = new URL(urlString);
InputStream is = (InputStream)url.getContent();
image = Drawable.createFromStream(is, "src");
} catch (MalformedURLException e) {
image = null;
} catch (IOException e) {
image = null;
}
return image;
}
}
解决方案
Put this in onCreate()
ImageView imageView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.order);
imageView = (ImageView)findViewById(R.id.imgView);
new DownloadFilesTask().execute();
}
And your AsyncTask
class should be like this,
private class DownloadFilesTask extends AsyncTask<Void, Void, Void> {
Drawable drawable;
@Override
protected Void doInBackground(Void... params) {
drawable = createDrawableFromURL(
"http://savagelook.com/misc/sl_drop2.png");
return null;
}
protected void onPostExecute(Void result) {
imageView.setImageDrawable(drawable);
}
}
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