Android use findViewById from other Activity

Question

Android use findViewById from other Activity

Asked 7 years, 4 months ago

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3

I need to assign a value to an element that is in another Activity

I’m trying this way:

MainActivity activityprincipal = new MainActivity();

WebView view = (WebView) activityprincipal.findViewById(R.id.webView);

2

It can’t be done like this. Explain what you want to achieve with it.

– ramaral

2017/02/22 at 16:49
i have a class, in this class I want to spend a loadurl on webview, but this webview is in another Activity, how can I do it

– Jefferson Mello Olynyki

2017/02/22 at 16:50
Why don’t you save the loadurl or the webview object and pass it on to another Activity by Intent?

– Giuliana Bezerra

2017/02/22 at 16:56
how to do this ? I don’t many on android/java

– Jefferson Mello Olynyki

2017/02/22 at 17:09
You want to pass an Activity B value to an Activity A (where Activity A is the "first" and Activity B is called by A)?

– Mr_Anderson

2017/02/22 at 17:37

1 answer

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by Thiago Luiz Domacoski • **7,310** points · Answer 1 · 2017-02-22T17:14:05+00:00

As stated by @Giulianabezerra in the comment, uses if a Intent to provide links between Activity’s at runtime.

Follow an example:

public class MainActivity extends AppCompatActivity {
    public final static String EXTRA_URL = "MainActivity.URL";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


    public void startActivity(String url) {
        Intent intent = new Intent(this, OtherActivity.class);
        // Adiconamos a url ao intent...
        intent.putExtra(EXTRA_URL, url);
        startActivity(intent);
    }
}

In the other Activity, we take the amount :

@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_other);

   Intent intent = getIntent();
   String url = intent.getStringExtra(MainActivity.EXTRA_URL);

  WebView view = (WebView)findViewById(R.id.webView);
 view.loadUrl(url);

}

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