Question

我使用名为“tabbed activity”的模板启动了一个项目，其中包含三个选项卡，我添加了第四个选项卡，我想在每个选项卡中使用webView加载不同的URL。我是android studio中的新手，我想我必须使用webView来做，但是看看google，教程，当然还有stackoverflow，我看到有人用tabActivity代替ActionBarActivity，尽管我有最后一个Android工作室版本，看起来像谷歌的模板使用已弃用的类我发现它真的很奇怪......我真的是新手与android工作室，但我正在尝试使用已弃用的类以模板的方式执行此操作。如果有人能够对我上面提到的那些方面有所了解，那就太好了。我的主要问题是为什么当我运行应用程序时，它会在每次加载相同的webView内容或如何为每个选项卡设置webView内容时加载。它总是在所有选项卡中加载最后一个选项卡URL。这就是我在mainActivity.java中所做的：

    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

我终于对我的代码进行了一些改进，基本上我在onCreate()方法之后将四个webView加载到四个不同的webView中，并将属性设置为隐藏，除了第一个，当我切换时到另一个标签我将隐藏的属性设置为可见。希望这段代码可以帮助别人并抱歉这个新手贴吧，干杯！

    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;
                    }
                }
            }
        });

无法使用actionBarActivity在每个选项卡中加载不同的webView内容

1 个答案: