無法使用actionBarActivity在每個選項卡中加載不同的webView內容

Question

我使用名為“選項卡式活動”的模板創建了一個項目，該模板帶有三個選項卡，並添加了第四個選項卡，我想在每個選項卡中使用webView加載不同的URL。 我是android studio的新手，我想我必須使用webView ，但是在查看google，教程以及當然在stackoverflow時，我已經看到人們使用tabActivity而不是ActionBarActivity ，盡管我有最后一個android studio版本，看來Google的模板使用的是不推薦使用的類，我覺得這確實很奇怪...我真的是android studio的新手，但我正在嘗試使用不推薦使用的類來做模板。 如果有人可以對我上面提到的那些方面有所啟發，那將是很好的。 我的主要問題是為什么當我運行該應用程序時，它每次都會加載相同的webView內容，或者如何為每個選項卡設置一個webView內容。 它總是在所有標簽中加載最后一個標簽網址。 這是我在mainActivity.java中所做的事情：

    package com.example.alfredo.guiaswebtabapp;

import java.util.Locale;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentPagerAdapter;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
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;


public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {

    /**
     * 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}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;
    private WebView myWebView;
    private WebView myWebView2;
    private WebView myWebView3;
    private WebView myWebView4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        // Set up the action bar.
        final ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // 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.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // When swiping between different sections, select the corresponding
        // tab. We can also use ActionBar.Tab#select() to do this if we have
        // a reference to the Tab.
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
            }
        });


        // For each of the sections in the app, add a tab to the action bar.
        setContentView(R.layout.fragment_main);
        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by
            // the adapter. Also specify this Activity object, which implements
            // the TabListener interface, as the callback (listener) for when
            // this tab is selected.

            switch (i) {
                case 0: {
                    // web view
                    this.myWebView = (WebView) findViewById(R.id.activity_main_webview);
                    myWebView.setWebViewClient(new WebViewClient());
                    WebSettings webSettings = myWebView.getSettings();
                    webSettings.setJavaScriptEnabled(true);
                    myWebView.loadUrl("http://example.com/1");
                }
                case 1: {
                    this.myWebView2 = (WebView) findViewById(R.id.activity_main_webview);
                    myWebView2.setWebViewClient(new WebViewClient());
                    WebSettings webSettings2 = myWebView2.getSettings();
                    webSettings2.setJavaScriptEnabled(true);
                    myWebView2.loadUrl("http://example.com/2");
                }
                case 2:
                    this.myWebView3 = (WebView) findViewById(R.id.activity_main_webview);
                    myWebView3.setWebViewClient(new WebViewClient());
                    WebSettings webSettings3 = myWebView3.getSettings();
                    webSettings3.setJavaScriptEnabled(true);
                    myWebView3.loadUrl("http://example.com/3");
                case 3:
                    this.myWebView4 = (WebView) findViewById(R.id.activity_main_webview);
                    myWebView4.setWebViewClient(new WebViewClient());
                    WebSettings webSettings4 = myWebView4.getSettings();
                    webSettings4.setJavaScriptEnabled(true);
                    myWebView4.loadUrl("http://example.com/4");
            }

            actionBar.addTab(
                    actionBar.newTab()
                            .setText(mSectionsPagerAdapter.getPageTitle(i))
                            .setTabListener(this)

            );
        }
    }

Answer 1

最后，我對代碼進行了一些改進，基本上是在onCreate()方法之后，將四個webView加載到四個不同的webView中，並將屬性設置為除第一個之外的隱藏屬性，並在切換到另一個選項卡時進行設置該屬性隱藏為可見。 希望這段代碼可以對某人有所幫助，對於這篇新手帖子，對不起，加油！

    private WebView myWebView;
    private WebView myWebView2;
    private WebView myWebView3;
    private WebView myWebView4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

this.myWebView = (WebView) findViewById(R.id.activity_main_webview);
        myWebView.setWebViewClient(new WebViewClient());
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        myWebView.loadUrl("http://example.com/1");


        this.myWebView2 = (WebView) findViewById(R.id.activity_main_webview2);
        myWebView2.setWebViewClient(new WebViewClient());
        WebSettings webSettings2 = myWebView2.getSettings();
        webSettings2.setJavaScriptEnabled(true);
        myWebView2.loadUrl("http://example.com/2");
        myWebView2.setVisibility(View.INVISIBLE);

        this.myWebView3 = (WebView) findViewById(R.id.activity_main_webview3);
        myWebView3.setWebViewClient(new WebViewClient());
        WebSettings webSettings3 = myWebView3.getSettings();
        webSettings3.setJavaScriptEnabled(true);
        myWebView3.loadUrl("http://example.com/3");
        myWebView3.setVisibility(View.INVISIBLE);

        this.myWebView4 = (WebView) findViewById(R.id.activity_main_webview4);
        myWebView4.setWebViewClient(new WebViewClient());
        WebSettings webSettings4 = myWebView4.getSettings();
        webSettings4.setJavaScriptEnabled(true);
        myWebView4.loadUrl("http://example.com/4");
        myWebView4.setVisibility(View.INVISIBLE);



mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
                switch (position) {
                    case 0: {
                        // web view
                        myWebView.setVisibility(View.VISIBLE);
                        myWebView2.setVisibility(View.INVISIBLE);
                        myWebView3.setVisibility(View.INVISIBLE);
                        myWebView4.setVisibility(View.INVISIBLE);
                        break;
                        //setContentView(R.layout.activity_main);
                    }
                    case 1: {

                        myWebView.setVisibility(View.INVISIBLE);
                        myWebView2.setVisibility(View.VISIBLE);
                        myWebView3.setVisibility(View.INVISIBLE);
                        myWebView4.setVisibility(View.INVISIBLE);
                        break;
                    }
                    case 2: {

                        myWebView.setVisibility(View.INVISIBLE);
                        myWebView2.setVisibility(View.INVISIBLE);
                        myWebView3.setVisibility(View.VISIBLE);
                        myWebView4.setVisibility(View.INVISIBLE);
                        break;
                    }
                    case 3: {
                        myWebView.setVisibility(View.INVISIBLE);
                        myWebView2.setVisibility(View.INVISIBLE);
                        myWebView3.setVisibility(View.INVISIBLE);
                        myWebView4.setVisibility(View.VISIBLE);
                        break;
                    }
                }
            }
        });