點擊選項webview刷新一次又一次

Question

我已經使用webview創建了一個webapp。在這裏我有一個左邊提取器，在不同的鏈接在同一個網頁視圖中打開。我面臨的問題是，只要我點擊抽屜中的任何選項，Web視圖就會打開並重新加載。在這裏我正在粘貼我的應用程序的XML和Java代碼。

主要活動FILE

package com.example.dr.app3; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.view.KeyEvent; 
import android.view.View; 
import android.support.design.widget.NavigationView; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
//import java.net.URI; 

public class MainActivity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 
// intialize web view 
private WebView webView; 

@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
    navigationView.setNavigationItemSelectedListener(this); 
    //webview control content 
    webView = (WebView) findViewById(R.id.webView); 
    WebSettings webSettings = webView.getSettings(); 
    webSettings.setJavaScriptEnabled(true); 
    //improve WebProformance 
    webView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH); 
    webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);//load cahe resources if requried otherwise load from network 
    webView.getSettings().setAppCacheEnabled(true);//enable catch 
    webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY); 
    webSettings.setDomStorageEnabled(true); 
    webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);//makes all coloms no wider then screen 
    webSettings.setUseWideViewPort(true);// 
    webSettings.setSavePassword(true);//save username password 
    webSettings.setSaveFormData(true);//save date and time 
    webSettings.setEnableSmoothTransition(true);// smooth transition 

    webView.loadUrl("http://school.techjunctionplace.in"); 
    //Force webview to open link in itself 
    webView.setWebViewClient(new MyWebViewClient()); 


} 

@Override 
public void onBackPressed() { 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    if (drawer.isDrawerOpen(GravityCompat.START)) { 
     drawer.closeDrawer(GravityCompat.START); 
    } else { 
     super.onBackPressed(); 
    } 
} 

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

@SuppressWarnings("StatementWithEmptyBody") 
@Override 
public boolean onNavigationItemSelected(MenuItem item) { 
    // Handle navigation view item clicks here. 
    int id = item.getItemId(); 

    if (id == R.id.dashboard) { 
     // Handle the camera action 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/"); 
       } else if (id == R.id.message) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/messages"); 
    } else if (id == R.id.calender) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/calender"); 
    } else if (id == R.id.classes_schedule) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/classschedule"); 
    } else if (id == R.id.attendance) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/attendance"); 
    } else if (id == R.id.attendance_stats) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/attendanceStats"); 
    }else if (id == R.id.staff) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/staffAttendance"); 
    }else if (id == R.id.hostel) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/hostel"); 
    }else if (id == R.id.hostel_category) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/hostelCat"); 
    }else if (id == R.id.library) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/library"); 
    }else if (id == R.id.media_center) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/media"); 
    }else if (id == R.id.teachers) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/teachers"); 
    }else if (id == R.id.students) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/students"); 
    }else if (id == R.id.parents) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/parents"); 
    }else if (id == R.id.grade_level) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/gradeLevels"); 
    }else if (id == R.id.study_material) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/materials"); 
    }else if (id == R.id.assignments) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/assignments"); 
    }else if (id == R.id.exam_list) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/examsList"); 
    }else if (id == R.id.online_exams) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/onlineExams"); 
    }else if (id == R.id.news_board) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/newsboard"); 
    }else if (id == R.id.events) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/events"); 
    }else if (id == R.id.fee_types) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/feeType"); 
    }else if (id == R.id.fee_allocation) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/feeAllocation"); 
    }else if (id == R.id.payments) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/payments"); 
    }else if (id == R.id.expenses) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/expenses"); 
    }else if (id == R.id.transportation) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/transports"); 
    }else if (id == R.id.classes) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/classes"); 
    }else if (id == R.id.sections) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/sections"); 
    }else if (id == R.id.subjects) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/subjects"); 
    }else if (id == R.id.reports) { 
     webView.loadUrl("http://www.school.techjunctionplace.in/#/reports"); 
    } 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    drawer.closeDrawer(GravityCompat.START); 
    return true; 
} 

private class MyWebViewClient extends WebViewClient { 
    @Override 
    public boolean shouldOverrideUrlLoading(WebView view, String url) { 
     if (Uri.parse(url).getHost().equals("www.school.techjunctionplace.in")) { 
      // open url content in web view 
      return false; 
     } 
     // here open external url in browser 
     Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
     startActivity(intent); 
     return true; 
    } 
    //ProgressDialogue 
    ProgressDialog pd = null; 

    @Override 
    public void onPageStarted(WebView view, String url, Bitmap favicon) { 
     pd=new ProgressDialog(MainActivity.this); 
     pd.setTitle("Please Wait.."); 
     pd.setMessage("It's Loading.."); 
     pd.show(); 
     super.onPageStarted(view, url, favicon); 
    } 

    @Override 
    public void onPageFinished(WebView view, String url) { 
     pd.dismiss(); 
     super.onPageFinished(view, url); 
    } 
} 

//goto previous page on back button 
@Override 
public boolean onKeyDown(int keycode, KeyEvent event) { 
    if (event.getAction() == KeyEvent.ACTION_DOWN) { 
     switch (keycode) { 
      case KeyEvent.KEYCODE_BACK: 
       if (webView.canGoBack()) { 
        webView.goBack(); 
       } else { 
        finish(); 
       } 
       return true; 
     } 
    } 

    return super.onKeyDown(keycode, event); 
}} 

SIDE抽屜

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android"> 

<group android:checkableBehavior="single"> 
    <item 
     android:id="@+id/dashboard" 
     android:icon="@drawable/ic_menu_camera" 
     android:title="Dashboard" /> 
    <item 
     android:id="@+id/message" 
     android:icon="@drawable/ic_menu_gallery" 
     android:title="Messages" /> 
    <item 
     android:id="@+id/calender" 
     android:icon="@drawable/ic_menu_slideshow" 
     android:title="Calender" /> 
    <item 
     android:id="@+id/classes_schedule" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Classes Schedule" /> 
</group> 

<item android:title="Attendance"> 
<menu> 
    <item 
     android:id="@+id/attendance" 
     android:icon="@drawable/ic_menu_share" 
     android:title="Attendance" /> 
    <item 
     android:id="@+id/attendance_stats" 
     android:icon="@drawable/ic_menu_send" 
     android:title="Attendance Stats" /> 
    <item 
     android:id="@+id/staff" 
     android:icon="@drawable/ic_menu_camera" 
     android:title="Staff Attendance" /> 
</menu> 
</item> 





<item android:title="Hostel Management"> 
    <menu> 
     <item 
      android:id="@+id/hostel" 
      android:icon="@drawable/ic_menu_share" 
      android:title="Hostel" /> 
     <item 
      android:id="@+id/hostel_category" 
      android:icon="@drawable/ic_menu_send" 
      android:title="Hostel Category" /> 
    </menu> 
</item> 

<item android:title="School Info"> 
    <menu> 
    <item 
     android:id="@+id/library" 
     android:icon="@drawable/ic_menu_camera" 
     android:title="Library" /> 
    <item 
     android:id="@+id/media_center" 
     android:icon="@drawable/ic_menu_gallery" 
     android:title="Media Center" /> 
    <item 
     android:id="@+id/teachers" 
     android:icon="@drawable/ic_menu_slideshow" 
     android:title="Teachers" /> 
    <item 
     android:id="@+id/students" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Students" /> 
    <item 
     android:id="@+id/parents" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Parents" /> 
    <item 
     android:id="@+id/grade_level" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Grade Level" /> 
    <item 
     android:id="@+id/study_material" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Study Material" /> 
    <item 
     android:id="@+id/assignments" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Assigenments" /> 
    <item 
     android:id="@+id/exam_list" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Exam List" /> 
    <item 
     android:id="@+id/online_exams" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Online Exams" /> 
    <item 
     android:id="@+id/news_board" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="News Board" /> 
    <item 
     android:id="@+id/events" 
     android:icon="@drawable/ic_menu_manage" 
     android:title="Events" /> 
    </menu> 
</item> 

<item android:title="Accounting"> 
    <menu> 
     <item 
      android:id="@+id/fee_types" 
      android:icon="@drawable/ic_menu_share" 
      android:title="Fee Types" /> 
     <item 
      android:id="@+id/fee_allocation" 
      android:icon="@drawable/ic_menu_send" 
      android:title="Fee Allocation" /> 
     <item 
      android:id="@+id/payments" 
      android:icon="@drawable/ic_menu_send" 
      android:title="Payments" /> 
     <item 
      android:id="@+id/expenses" 
      android:icon="@drawable/ic_menu_send" 
      android:title="Expenses" /> 
    </menu> 
</item> 

<item android:title="Transportation"> 
    <menu> 
    <item 
     android:id="@+id/transportation" 
     android:icon="@drawable/ic_menu_camera" 
     android:title="Transportation" /> 
    </menu> 
</item> 

<item android:title="Classes"> 
    <menu> 
     <item 
      android:id="@+id/classes" 
      android:icon="@drawable/ic_menu_share" 
      android:title="Classes" /> 
     <item 
      android:id="@+id/sections" 
      android:icon="@drawable/ic_menu_send" 
      android:title="Sections" /> 
    </menu> 
</item> 
<item android:title="Reports"> 
    <menu> 
     <item 
      android:id="@+id/subjects" 
      android:icon="@drawable/ic_menu_share" 
      android:title="Subjects" /> 
     <item 
      android:id="@+id/reports" 
      android:icon="@drawable/ic_menu_send" 
      android:title="Reports" /> 
    </menu> 
</item> 

在上面的代碼中，即使XML文件的0 Uri.parse（url）.getHost（）。equals（「www.school.techjunctionplace.in」））

也不起作用。 我是一名Android初學者，請幫助確定我的代碼中的實際問題。

webView.loadUrl("http://school.techjunctionplace.in"); 

與

webView.loadUrl("http://www.school.techjunctionplace.in"); 

在網頁視圖客戶端的一些變化更換：

Answer 1

在onCreate方法

private class MyWebViewClient extends WebViewClient { 
     @Override 
     public boolean shouldOverrideUrlLoading(WebView view, String url) { 
      if (Uri.parse(url).getHost().contains("www.school.techjunctionplace.in")) { 
       // open url content in web view 
       return false; 
      } 
      // here open external url in browser 
      Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
      startActivity(intent); 
      return true; 
     } 
     //ProgressDialogue 
     ProgressDialog pd = null; 

     @Override 
     public void onPageStarted(WebView view, String url, Bitmap favicon) { 
      if(pd == null) { 
       pd = new ProgressDialog(HomeActivity.this); 
       pd.setTitle("Please Wait.."); 
       pd.setMessage("It's Loading.."); 
       pd.show(); 
      } 
      super.onPageStarted(view, url, favicon); 
     } 

     @Override 
     public void onPageFinished(WebView view, String url) { 
      if(pd != null && pd.isShowing()) 
       pd.dismiss(); 
      pd = null; 
      super.onPageFinished(view, url); 
     } 
    }