Как скачивать файлы через webview?

Question

Максим @kilpro_css

Android
Java

Как скачивать файлы через webview?

есть несколько фрагментов(играют роль вкладок), внутри каждого WebView. одна из вкладок открывает почту, при нажатии на ссылку с документом(dox, exel, jpg, png и тд) выдает ошибку

Не удалось открыть веб-страницу

подскажите как реализовать скачивание данных файлов или запускать их через приложение установленное на устройстве

Ссылки на файлы прямые

MainActivity:

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;

/**
 * The {@link ViewPager} that will host the section contents.
 */
private ViewPager mViewPager;

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



    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    // 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);
}


/**
 * 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) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        TextView textView = (TextView) rootView.findViewById(R.id.section_label);
        textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
        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) {
        switch (position){
            case 0:
                Tab1 tab1 = new Tab1();
                return tab1;
            case 1:
                Tab2 tab2 = new Tab2();
                return tab2;
            case 2:
                Tab3 tab3 = new Tab3();
                return tab3;
            case 3:
                Tab4 tab4 = new Tab4();
                return tab4;
            case 4:
                Tab5 tab5 = new Tab5();
                return tab5;
        }
        return null;
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return 5;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "вкладка 1";
            case 1:
                return "вкладка 2";
            case 2:
                return "вкладка 3";
            case 3:
                return "вкладка 4";
            case 4:
                return "вкладка 5";
        }
        return null;
    }

фрагмент с Webview:

public class Tab4 extends Fragment {

public static WebView mWebView;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v=inflater.inflate(R.layout.tab4, container, false);
    mWebView = (WebView) v.findViewById(R.id.webViewT4);
    if (savedInstanceState == null)
    {
        mWebView.loadUrl("http://mail.example.ru");
    }
    mWebView.getSettings().setBuiltInZoomControls(true);
    mWebView.getSettings().setDisplayZoomControls(false);
    mWebView.getSettings().setLoadsImagesAutomatically(true);
    mWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
    mWebView.getSettings().setPluginState(WebSettings.PluginState.ON);
    mWebView.setOnKeyListener(new View.OnKeyListener(){

        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK
                    && event.getAction() == MotionEvent.ACTION_UP
                    && mWebView.canGoBack())
            {
                mWebView.goBack();
                return true;
            }
            return false;
        }

    });


    mWebView.getSettings().setAllowFileAccess(true);
    mWebView.getSettings().setAllowContentAccess(true);
    mWebView.getSettings().setAllowFileAccessFromFileURLs(true);
    mWebView.getSettings().setAllowUniversalAccessFromFileURLs(true);
    mWebView.getSettings().setDomStorageEnabled(true);

    // Enable Javascript
    WebSettings webSettings = mWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);

    // Force links and redirects to open in the WebView instead of in a browser
    mWebView.setWebViewClient(new WebViewClient());

    return v;
}

}