Android Studio - Warum WebView Nicht Web URL Laden

Question

Android Studio - Warum WebView nicht Web-URL nicht geladen

------------ ------------------- My MainActivity.java --------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- ------------------

package com.spgisslive; 
 

 
import android.support.design.widget.TabLayout; 
 
import android.support.design.widget.FloatingActionButton; 
 
import android.support.design.widget.Snackbar; 
 
import android.support.v7.app.AppCompatActivity; 
 
import android.support.v7.widget.Toolbar; 
 

 
import android.support.v4.app.Fragment; 
 
import android.support.v4.app.FragmentManager; 
 
import android.support.v4.app.FragmentPagerAdapter; 
 
import android.support.v4.view.ViewPager; 
 
import android.os.Bundle; 
 
import android.view.LayoutInflater; 
 
import android.view.Menu; 
 
import android.view.MenuItem; 
 
import android.view.View; 
 
import android.view.ViewGroup; 
 

 
import android.webkit.WebSettings; 
 
import android.webkit.WebView; 
 
import android.webkit.WebViewClient; 
 
import android.widget.TextView; 
 

 
import static com.spgisslive.R.id.webview; 
 

 
public class MainActivity extends AppCompatActivity { 
 

 
    /** 
 
    * The {@link android.support.v4.view.PagerAdapter} that will provide 
 
    * fragments for each of the sections. We use a 
 
    * {@link FragmentPagerAdapter} derivative, which will keep every 
 
    * loaded fragment in memory. If this becomes too memory intensive, it 
 
    * may be best to switch to a 
 
    * {@link android.support.v4.app.FragmentStatePagerAdapter}. 
 
    */ 
 
    private SectionsPagerAdapter mSectionsPagerAdapter; 
 
    private WebView mWebView; 
 

 
    private ViewPager mViewPager; 
 

 
    @Override 
 
    protected void onCreate(Bundle savedInstanceState) { 
 
     super.onCreate(savedInstanceState); 
 

 
     setContentView(R.layout.activity_main); 
 

 
     // Create the adapter that will return a fragment for each of the three 
 
     // primary sections of the activity. 
 
     mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
 

 
     // Set up the ViewPager with the sections adapter. 
 
     mViewPager = (ViewPager) findViewById(R.id.container); 
 
     mViewPager.setAdapter(mSectionsPagerAdapter); 
 

 
     TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
 
     tabLayout.setupWithViewPager(mViewPager); 
 

 

 

 

 

 

 

 

 
    } 
 

 

 
    @Override 
 
    public boolean onCreateOptionsMenu(Menu menu) { 
 
     // Inflate the menu; this adds items to the action bar if it is present. 
 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
 
     return true; 
 
    } 
 

 
    @Override 
 
    public boolean onOptionsItemSelected(MenuItem item) { 
 
     // Handle action bar item clicks here. The action bar will 
 
     // automatically handle clicks on the Home/Up button, so long 
 
     // as you specify a parent activity in AndroidManifest.xml. 
 
     int id = item.getItemId(); 
 

 
     //noinspection SimplifiableIfStatement 
 
     if (id == R.id.action_settings) { 
 
      return true; 
 
     } 
 

 
     return super.onOptionsItemSelected(item); 
 
    } 
 

 
    /** 
 
    * A placeholder fragment containing a simple view. 
 
    */ 
 
    public static class PlaceholderFragment extends Fragment { 
 
     /** 
 
     * The fragment argument representing the section number for this 
 
     * fragment. 
 
     */ 
 
     private static final String ARG_SECTION_NUMBER = "section_number"; 
 

 
     public PlaceholderFragment() { 
 
     } 
 

 
     /** 
 
     * Returns a new instance of this fragment for the given section 
 
     * number. 
 
     */ 
 
     public static PlaceholderFragment newInstance(int sectionNumber) { 
 
      PlaceholderFragment fragment = new PlaceholderFragment(); 
 
      Bundle args = new Bundle(); 
 
      args.putInt(ARG_SECTION_NUMBER, sectionNumber); 
 
      fragment.setArguments(args); 
 
      return fragment; 
 
     } 
 

 
     @Override 
 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
 
           Bundle savedInstanceState) { 
 
      if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) { 
 
       View rootView = inflater.inflate(R.layout.fragment_sub_page01, container, false); 
 
       return rootView; 
 
      } 
 
      else if (getArguments().getInt(ARG_SECTION_NUMBER) == 2) { 
 
       View rootView = inflater.inflate(R.layout.fragment_sub_page02, container, false); 
 
       return rootView; 
 
      } 
 
      else if (getArguments().getInt(ARG_SECTION_NUMBER) == 3) { 
 
       View rootView = inflater.inflate(R.layout.fragment_sub_page03, container, false); 
 
       return rootView; 
 
      } 
 
      else 
 
      { 
 
       View rootView = inflater.inflate(R.layout.fragment_main, container, false); 
 
       return rootView; 
 
      } 
 
     } 
 
    } 
 

 
    /** 
 
    * A {@link FragmentPagerAdapter} that returns a fragment corresponding to 
 
    * one of the sections/tabs/pages. 
 
    */ 
 
    public class SectionsPagerAdapter extends FragmentPagerAdapter { 
 

 
     public SectionsPagerAdapter(FragmentManager fm) { 
 
      super(fm); 
 
     } 
 

 
     @Override 
 
     public Fragment getItem(int position) { 
 
      // getItem is called to instantiate the fragment for the given page. 
 
      // Return a PlaceholderFragment (defined as a static inner class below). 
 
      return PlaceholderFragment.newInstance(position + 1); 
 
     } 
 

 
     @Override 
 
     public int getCount() { 
 
      // Show 3 total pages. 
 
      return 3; 
 
     } 
 

 
     @Override 
 
     public CharSequence getPageTitle(int position) { 
 
      switch (position) { 
 
       case 0: 
 
        return "Page 01"; 
 
       case 1: 
 
        return "Page 02"; 
 
       case 2: 
 
        return "SECTION 3"; 
 
      } 
 
      return null; 
 
     } 
 
    } 
 
}

Leider habe ich nicht gut sprechen kann. Vielen Dank.

Answer 1

Try WebView mit URL laden in onCreateView() mit Check ersten Abschnitt Fall von PlaceholderFragment wie unten:

if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) { 
    View rootView = inflater.inflate(R.layout.fragment_sub_page01, container, false); 
    mWebView = (WebView) rootView.findViewById(R.id.webview); 
    mWebView.loadUrl("http://www.google.com") 
    return rootView; 
} 

Eine andere Möglichkeit, unter Verwendung jedes Fragment Klasse zu erreichen:

public class SectionsPagerAdapter extends FragmentPagerAdapter { 

     public SectionsPagerAdapter(FragmentManager fm) { 
      super(fm); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      if(position==0){ 
       return SubPage01.newInstance(position + 1); 
      }else if(position==1){ 
       return SubPage02.newInstance(position + 1); 
      }else{ 
       return SubPage03.newInstance(position + 1); 
      } 
     } 

     @Override 
     public int getCount() { 
      // Show 3 total pages. 
      return 3; 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      switch (position) { 
       case 0: 
        return "Page 01"; 
       case 1: 
        return "Page 02"; 
       case 2: 
        return "SECTION 3"; 
      } 
      return null; 
     } 
}