Android WebView LoadData Dare NullPointerException

StackOverflow https://stackoverflow.com/questions/5049914

Domanda

Ho usato una visualizzazione Web Vista Web denominata Testview per caricare i dati HTML in WebView.Per questo sto usando il seguente codice.

Testview.loadData("<html><body>helloindia</body></html>", "text/html", "utf-8");

Ho dato <uses-permission android:name="android.permission.INTERNET" /> nel manifest.Ma questo sopra la locazione del codice sta generando NullPointerException.Qualcuno può indicare il problema nel mio codice?

È stato utile?

Soluzione

As @m0s pointed in comment: make sure Textview is initialized:

textview = new WebView(this);  // used inside an Activity

Also, it is a Java custom to write class names with first letter capitalized (WebView) and instances with first letter in lower-case (textview), so that they are easily distinguished.

Update:

If this line returns null:

Textview = (WebView)this.findViewById(R.id.testview)

then you most probably forgot to call:

setContentView(R.layout.main);

in your activity.onCreate() method. The javadoc of findViewById(int) says:

Finds a view that was identified by the id attribute from the XML THAT WAS 
PROCESSED in onCreate(Bundle).

That's what setContentView() does (processes the layout XML):

Set the activity content from a layout resource. The resource will be inflated,
adding all top-level views to the activity.
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