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androidhtmlwebviewnullpointerexceptionloaddata

Android webview loaddata giving NullPointerException

I have used a webview named Testview to load html data in the webview. for that I am using the following code.

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

I have given <uses-permission android:name="android.permission.INTERNET" /> in the manifest. But this above loine of code is generating NullPointerException. Can anyone point out the problem in my code?

Solution

  • 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.