我在TextView中显示HTML:
String html = "Hello " +
"<img src='http://www.gravatar.com/avatar/" +
"f9dd8b16d54f483f22c0b7a7e3d840f9?s=32&d=identicon&r=PG'/>" +
" This is a test " +
"<img src='http://www.gravatar.com/avatar/a9317e7f0a78bb10a980cadd9dd035c9?s=32&d=identicon&r=PG'/>";
Spanned htmlSpan = Html.fromHtml(html, imageParser, null);
textView.setText(htmlSpan);
以下ImageParser
完成工作:
public class URLImageParser implements Html.ImageGetter {
Context c;
View container;
/***
* Construct the URLImageParser which will execute AsyncTask and refresh the container
* @param t
* @param c
*/
public URLImageParser(View t, Context c) {
this.c = c;
this.container = t;
}
public Drawable getDrawable(String source) {
URLDrawable urlDrawable = new URLDrawable();
// get the actual source
ImageGetterAsyncTask asyncTask =
new ImageGetterAsyncTask( urlDrawable);
asyncTask.execute(source);
// return reference to URLDrawable where I will change with actual image from
// the src tag
return urlDrawable;
}
public class ImageGetterAsyncTask extends AsyncTask<String, Void, Drawable> {
URLDrawable urlDrawable;
public ImageGetterAsyncTask(URLDrawable d) {
this.urlDrawable = d;
}
@Override
protected Drawable doInBackground(String... params) {
String source = params[0];
return fetchDrawable(source);
}
@Override
protected void onPostExecute(Drawable result) {
// set the correct bound according to the result from HTTP call
urlDrawable.setBounds(0, 0, 0 + result.getIntrinsicWidth(), 0
+ result.getIntrinsicHeight());
// change the reference of the current drawable to the result
// from the HTTP call
urlDrawable.drawable = result;
// redraw the image by invalidating the container
URLImageParser.this.container.invalidate();
}
/***
* Get the Drawable from URL
* @param urlString
* @return
*/
public Drawable fetchDrawable(String urlString) {
try {
InputStream is = fetch(urlString);
Drawable drawable = Drawable.createFromStream(is, "src");
drawable.setBounds(0, 0, 0 + drawable.getIntrinsicWidth(), 0
+ drawable.getIntrinsicHeight());
return drawable;
} catch (Exception e) {
return null;
}
}
private InputStream fetch(String urlString) throws MalformedURLException, IOException {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet request = new HttpGet(urlString);
HttpResponse response = httpClient.execute(request);
return response.getEntity().getContent();
}
}
}
但它不适用于更大的图像。无效的String
如下:
String html = "Hello " +
"<img src='http://darwin.suav.biz/image/data/produse/Tablete/Apple/Ipad 4/hero_slide1.png" +
" This is a test " +
"<img src='http://www.gravatar.com/avatar/a9317e7f0a78bb10a980cadd9dd035c9?s=32&d=identicon&r=PG'/>";
崩溃时出现以下错误:
java.lang.NullPointerException
at md.darwin.catalog.manager.URLImageParser$ImageGetterAsyncTask$1.run(URLImageParser.java:70)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5038)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
URLImageParser.java:70
是:
urlDrawable.setBounds(0, 0, result.getIntrinsicWidth(), result.getIntrinsicHeight());
我也尝试使用Picasso
,这里找到的方法是:https://github.com/aegis123/Bettyskitchen-app/blob/master/BettysKitchen-app/src/main/java/com/bettys/kitchen/recipes/app/Utils/ImageGetter.java
但我收到错误(没有崩溃):Failed to decode stream
有谁知道更大的图像会出现什么问题?为什么Null
内有onPostExecute
?
答案 0 :(得分:1)