TabLayout + ViewPager + WebView + Fragment

水深无声 2023-03-01 09:21 219阅读 0赞

**效果**  
![2020072313025724.gif_pic_center][]

*  activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".MainActivity">
    
        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tl_tabs"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            app:tabSelectedTextColor="#FF0000"
            app:tabTextColor="#000000" />
    
        <androidx.viewpager.widget.ViewPager
            android:id="@+id/vp_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
    
        </androidx.viewpager.widget.ViewPager>
    
    
    </LinearLayout>

*  fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <WebView
            android:id="@+id/fragm_web"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    
    </LinearLayout>

*  MainActivity.java

package com.example.tablayoutdemo;
    
    import android.content.Intent;
    import android.net.Uri;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.KeyEvent;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.webkit.WebResourceRequest;
    import android.webkit.WebSettings;
    import android.webkit.WebView;
    import android.webkit.WebViewClient;
    import android.widget.TextView;
    
    import androidx.annotation.NonNull;
    import androidx.annotation.Nullable;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.fragment.app.Fragment;
    import androidx.fragment.app.FragmentPagerAdapter;
    import androidx.viewpager.widget.ViewPager;
    
    import com.google.android.material.tabs.TabLayout;
    
    import java.util.ArrayList;
    import java.util.List;
    
    
    public class MainActivity extends AppCompatActivity { 
    
    
        private TabLayout tlTabs;
        private ViewPager vpContent;
        private static final String TAG = "MainActivity";
    
        List<Fragment> fragments = new ArrayList<>();
        List<String> titles = new ArrayList<>();
    
        @Override
        protected void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initViews();
            fragments.add(new MyFragment("https://www.baidu.com"));
            fragments.add(new MyFragment("https://www.zhihu.com"));
            fragments.add(new MyFragment("https://www.sogou.com"));
            fragments.add(new MyFragment("https://cn.bing.com"));
            titles.add("百度");
            titles.add("知乎");
            titles.add("搜狗");
            titles.add("Bing");
            vpContent.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager(), FragmentPagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) { 
                @Override
                public Fragment getItem(int position) { 
                    return fragments.get(position);
                }
    
                @Override
                public int getCount() { 
                    return fragments.size();
                }
    
                @Override
                public void destroyItem(ViewGroup container, int position, Object object) { 
                    super.destroyItem(container, position, object);
                }
    
                @Nullable
                @Override
                public CharSequence getPageTitle(int position) { 
    
                    return titles.get(position);
                }
            });
    
            tlTabs.setupWithViewPager(vpContent);
        }
    
    
        private void initViews() { 
            tlTabs = findViewById(R.id.tl_tabs);
            vpContent = findViewById(R.id.vp_content);
        }
    
        public static class MyFragment extends Fragment { 
            private String url = "";
    
            public MyFragment(String url) { 
                this.url = url;
            }
    
            private WebView webView;
    
            @Nullable
            @Override
            public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
                View view = inflater.inflate(R.layout.fragment1, null);
                webView = view.findViewById(R.id.fragm_web);
                WebSettings webSettings = webView.getSettings();
                // 让WebView能够执行javaScript
                webSettings.setJavaScriptEnabled(true);
                webSettings.setDomStorageEnabled(true);
                // 让JavaScript可以自动打开windows
                webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
                webSettings.setAppCacheEnabled(true);
                // 将图片调整到合适的大小
                webSettings.setUseWideViewPort(true);
                // 缩放至屏幕的大小
                webSettings.setLoadWithOverviewMode(true);
                // 支持缩放(适配到当前屏幕)
                webSettings.setSupportZoom(true);
                // 设置编码
                webSettings.setDefaultTextEncodingName("utf-8");
                webView.loadUrl(url);
    
                //实现：WebView里的链接，都在自身打开，不调用系统浏览器
                webView.setWebViewClient(new WebViewClient() { 
                    @Override
                    public boolean shouldOverrideUrlLoading(WebView view, String url) { 
                        Log.i(TAG, ">>>" + url);
                        try { 
                            if (url.startsWith("http:") || url.startsWith("https:")) { 
                                view.loadUrl(url);
                            } else { 
                                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                                startActivity(intent);
                            }
                            return true;
                        } catch (Exception e) { 
                            return false;
                        }
                    }
                });
    
    
                //实现：按手机回退键，如果浏览器有上一个网页，则返回上一个网页
                webView.setOnKeyListener(new View.OnKeyListener() { 
                    @Override
                    public boolean onKey(View v, int keyCode, KeyEvent event) { 
                        if (event.getAction() == KeyEvent.ACTION_DOWN) { 
                            if (keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) { 
                                webView.goBack();
                                return true;
                            }
                        }
                        return false;
                    }
                });
                return view;
            }
    
        }
    }

[2020072313025724.gif_pic_center]: https://img-blog.csdnimg.cn/2020072313025724.gif#pic_center