Can Not Resolve Method 'findviewbyid(int)'

January 30, 2024 Post a Comment

I'm having a trouble with findViewByid but I can't find where the problem is. Here's my FirstFragment class code: import android.app.Fragment; import android.os.Bundle; import andr

Solution 1:

You need to do this in onCreateView:

@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle   savedInstanceState) {
   Viewview=  inflater.inflate(R.layout.secondefragment, container, false);
    mWebView = (WebView) view.findViewById(R.id.activity_main_webview);
   progressBar = (ProgressBar) view.findViewById(R.id.progressBar1);

   WebSettingswebSettings= mWebView.getSettings();
   webSettings.setJavaScriptEnabled(true);
   mWebView.loadUrl("http://www.google.com");

   return view;


}

Solution 2:

Fragment doesn't provide thefindViewById() method. This is provided in Activity or View. When implementing a Fragment you don't inflate your views in onCreate() (like you normally do in an Activity.) Instead, you do it in onCreateView() and you need to use the inflated root View to find the ID within the layout you inflated.

Solution 3:

getActivity().findViewById() works. However, this isn't a good practice because the fragment may be reused in another activity.

The recommended way for this is to define an interface.

The interface should contain methods by which the fragment needs to communicate with its parent activity.
```
publicinterfaceMyInterfcae {
    voidshowTextView();
}
```

Then your activity implements that Interface.

publicclassMyActivityextendsActivityimplementsMyInterfcae {
    @OverridepublicvoidshowTextView(){
        findViewById(R.id.textview).setVisibility(View.VISIBLE);
    }
}

In that fragment grab a reference to the interface.

MyInterfacemif= (MyInterface) getActivity();

Call a method.
```
mif.showTextView();
```

This way, the fragment and the activity are fully decoupled and every activity which implements that fragment, is able to attach that fragment to itself.

Solution 4:

I had this problem when I downloaded sample project from github. This project had

compileSdkVersion 23
buildToolsVersion "23.0.0"
targetSdkVersion 23

in Activity context and findViewById() were in red color inside onCreate() method. So I updated the above versions to

compileSdkVersion 25
buildToolsVersion "25.0.3"
targetSdkVersion 25

and error got resolved.

Solution 5:

I meet the same question in Android studio learning,just because I create the project by Fragment. Choose Blank Activity with no Fragment would solve it.

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