任何帮助或提示将不胜感激。 我可以使用以下WebView本身在android中打开Web应用程序，但是当我尝试将Webview与菜单结合使用时，似乎不起作用，
有效的MainActivity代码： 包com.example.app;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Message;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import java.net.URLEncoder;
public class MainActivity extends Activity {
private WebView mWebView;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWebView = findViewById(R.id.activity_main_webview);
// Force links and redirects to open in the WebView instead of in a browser
mWebView.setWebViewClient(new WebViewClient());
// Enable Javascript
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
// REMOTE RESOURCE
try {
String html = "<!DOCTYPE html>" +
"<html>" +
"<head>" +
"<script>" +
"function submitData(){ "+
"document.form1.submit();"+
"}" +
"</script>" +
"</head>" +
"<body onload='submitData()'> "+
"<form action=\"https://www.test.ca\" method='post' name='form1'>\n"+
"<input type='hidden' name='user' value='test.ca'><br/>" +
"<input type='hidden' name='password' value='test1'><br>" +
"</form>" +
"</body>" +
"</html>";
mWebView.loadData(html, "text/html", "UTF-8");
html = "<!DOCTYPE html>" +
"<html>" +
"<head>" +
"<script>" +
"function submitData(){ "+
"document.form1.submit();"+
"}" +
"</script>" +
"</head>" +
"<body onload='submitData()'> "+
"<form action=\"https://www.test.ca/pages/recordList.cfm?list=Allergy\" method='post' name='form1'>\n"+
"</form>" +
"</body>" +
"</html>";
mWebView.loadData(html, "text/html", "UTF-8");
}
catch(Exception e)
{
System.out.println("error message:"+e.getMessage());
}
}
// Prevent the back-button from closing the app
@Override
public void onBackPressed() {
if(mWebView.canGoBack()) {
mWebView.goBack();
} else {
super.onBackPressed();
}
}
}
但是，与菜单结合使用时，以下Web视图不起作用：
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.util.Log;
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.WebView;
import android.widget.ExpandableListView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.webkit.WebSettings;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
ExpandableListAdapter expandableListAdapter;
ExpandableListView expandableListView;
List<MenuModel> headerList = new ArrayList<>();
HashMap<MenuModel, List<MenuModel>> childList = new HashMap<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = 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();
}
});
expandableListView = findViewById(R.id.expandableListView);
prepareMenuData();
populateExpandableList();
DrawerLayout drawer = findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@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.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private void prepareMenuData() {
MenuModel menuModel = new MenuModel("PERSONAL RECORDS", true, true, ""); //Menu of Java Tutorials
headerList.add(menuModel);
List<MenuModel> childModelsList = new ArrayList<>();
MenuModel childModel = new MenuModel("ALLERGIES", false, false, "https://www.xxx.ca/pages/recordList.cfm?list=Allergy");
childModelsList.add(childModel);
childModel = new MenuModel("ADVANCE CARE PLANNING", false, false, "https://www.journaldev.com/19187/java-fileinputstream");
childModelsList.add(childModel);
childModel = new MenuModel("CONDITIONS", false, false, "https://www.journaldev.com/19115/java-filereader");
childModelsList.add(childModel);
childModel = new MenuModel("DIARY", false, false, "https://www.journaldev.com/19115/java-filereader");
childModelsList.add(childModel);
childModel = new MenuModel("IMMUNIZATIONS", false, false, "https://www.journaldev.com/19115/java-filereader");
childModelsList.add(childModel);
childModel = new MenuModel("MEASUREMENTS", false, false, "https://www.journaldev.com/19115/java-filereader");
childModelsList.add(childModel);
childModel = new MenuModel("MEDICATIONS", false, false, "https://www.journaldev.com/19115/java-filereader");
childModelsList.add(childModel);
if (menuModel.hasChildren) {
Log.d("API123","here");
childList.put(menuModel, childModelsList);
}
menuModel = new MenuModel("CLINICAL RECORDS", true, false, "https://www.journaldev.com/9333/android-webview-example-tutorial"); //Menu of Android Tutorial. No sub menus
headerList.add(menuModel);
childModelsList = new ArrayList<>();
childModel = new MenuModel("TEST CLINICAL RECORDS", false, false, "https://www.journaldev.com/7153/core-java-tutorial");
childModelsList.add(childModel);
if (!menuModel.hasChildren) {
childList.put(menuModel, childModelsList);
}
childModelsList = new ArrayList<>();
menuModel = new MenuModel("MESSAGES", true, true, ""); //Menu of Python Tutorials
headerList.add(menuModel);
childModel = new MenuModel("INBOX", false, false, "https://www.journaldev.com/19243/python-ast-abstract-syntax-tree");
childModelsList.add(childModel);
childModel = new MenuModel("SENT", false, false, "https://www.journaldev.com/19226/python-fractions");
childModelsList.add(childModel);
if (menuModel.hasChildren) {
childList.put(menuModel, childModelsList);
}
}
private void populateExpandableList() {
expandableListAdapter = new ExpandableListAdapter(this, headerList, childList);
expandableListView.setAdapter(expandableListAdapter);
expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
if (headerList.get(groupPosition).isGroup) {
if (!headerList.get(groupPosition).hasChildren) {
WebView webView = findViewById(R.id.webView);
webView.loadUrl(headerList.get(groupPosition).url);
onBackPressed();
}
}
return false;
}
});
expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
if (childList.get(headerList.get(groupPosition)) != null) {
MenuModel model = childList.get(headerList.get(groupPosition)).get(childPosition);
if (model.url.length() > 0) {
WebView webView = findViewById(R.id.webView);
// Enable Javascript
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
String html = "<!DOCTYPE html>" +
"<html>" +
"<head>" +
"<script>" +
"function submitData(){ "+
"document.form1.submit();"+
"}" +
"</script>" +
"</head>" +
"<body onload='submitData()'> "+
"<form action=\"https://www.test.ca\" method='post' name='form1'>\n"+
"<input type='hidden' name='user' value='test.ca'><br/>" +
"<input type='hidden' name='password' value='test'><br>" +
"</form>" +
"</body>" +
"</html>";
webView.loadData(html, "text/html", "UTF-8");
html = "<!DOCTYPE html>" +
"<html>" +
"<head>" +
"<script>" +
"function submitData(){ "+
"document.form1.submit();"+
"}" +
"</script>" +
"</head>" +
"<body onload='submitData()'> "+
"<form action=\"https://www.test.ca/pages/recordList.cfm?list=Allergy\" method='post' name='form1'>\n"+
"</form>" +
"</body>" +
"</html>";
webView.loadData(html, "text/html", "UTF-8");
onBackPressed();
}
}
return false;
}
});
}
}
androidManifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.journaldev.navigationviewexpandablelistview">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
在此处输入代码