Cannot find symbol method startActivity(android.content.Intent)

问题

I am a beginner in making android applications. I have made a web view which shows my web page. My web page consists contact buttons that i want to be opened in external apps like mail and dial. Therefore i got some help and got a code like this

import android.app.Activity;
import android.content.Intent;
import android.net.MailTo;
import android.net.Uri;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class ourViewClient extends WebViewClient {

@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
    try{
        System.out.println("url called:::" + url);
        if (url.startsWith("tel:")) {
            Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
            startActivity(intent);
        }  else if (url.startsWith("http:")
                || url.startsWith("https:")) {

            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(intent);

        }  else if (url.startsWith("mailto:")) {

            MailTo mt=MailTo.parse(url);

            send_email(mt.getTo());

        }
        else {
            return false;
        }
    }catch(Exception e){
        e.printStackTrace();
    }

    return true;
}



public void send_email(String email_add) {
    System.out.println("Email address::::" + email_add);

    final Intent emailIntent = new Intent(
            android.content.Intent.ACTION_SEND);
    emailIntent.setType("plain/text");
    emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
            new String[] { email_add });
    emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");
    emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, "");
    startActivity(
            Intent.createChooser(emailIntent, "Send mail..."));

}

}

But then i got this error "Cannot find symbol method startActivity(android.content.Intent)" What is wrong with the startactivity?

回答1:

WebViewClient doesn't have context so you cannot directly start an activity

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
view.getContext().startActivity(intent);

---

Alternatively, pass context to webViewClient using its constructor

public class ourViewClient extends WebViewClient {

Context context;


public ourViewClient (Context c){
    this.context = c;
}


@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
    try{
        System.out.println("url called:::" + url);
        if (url.startsWith("tel:")) {
            Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
            context.startActivity(intent);
        }  else if (url.startsWith("http:")
                || url.startsWith("https:")) {

            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            context.startActivity(intent);

        }  else if (url.startsWith("mailto:")) {

            MailTo mt=MailTo.parse(url);

            send_email(mt.getTo());

        }
        else {
            return false;
        }
    }catch(Exception e){
        e.printStackTrace();
    }


    return true;
}

来源：https://stackoverflow.com/questions/23872245/cannot-find-symbol-method-startactivityandroid-content-intent