简易浏览器App webview

时间：2023-11-10 16:37:44
简易浏览器App webview
简易浏览器App webview

使用



public class MainActivity extends Activity {



    @Override


    protected void onCreate(Bundle savedInstanceState) {


        super.onCreate(savedInstanceState);


        TextView textView = new TextView(this);


        textView.setText("点击打开我的博客");


        textView.setGravity(Gravity.CENTER);


        setContentView(textView);


        textView.setOnClickListener(new OnClickListener() {



            @Override


            public void onClick(View v) {


                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.cnblogs.com/baiqiantao/"));


                intent.addCategory(Intent.CATEGORY_DEFAULT);


                intent.addCategory(Intent.CATEGORY_BROWSABLE);


                intent.putExtra(WebViewActivity.TITLE, "包青天的Android之旅");


                Toast.makeText(MainActivity.this, "Uri=" + intent.getData(), Toast.LENGTH_LONG).show();


                Log.i("bqt",


                        "TITLE=" + intent.getStringExtra(WebViewActivity.TITLE) + "Uri=" + intent.getData() + "\nScheme=" + intent.getScheme() + "\nType="


                                + intent.getType() + "\nFlags=" + intent.getFlags() + "\nPackage=" + intent.getPackage() + "\nAction=" + intent.getAction()


                                + "\nCategory=" + intent.getCategories());


                //TITLE=包青天的Android之旅


                //Uri=http://www.cnblogs.com/baiqiantao/


                //Scheme=http


                //Type=null


                //Flags=0


                //Package=null


                //Action=android.intent.action.VIEW


                //Category={android.intent.category.DEFAULT,//android.intent.category.BROWSABLE}


                startActivity(intent);


            }


        });


    }


}

代码-浏览器Activity 



public class WebViewActivity extends Activity implements OnClickListener {


    public static final String TITLE = "标题";


    public static final String JS_INTERFACE = "Android";//JS调用类名


    private WebView webview;


    private ProgressBar progress_bar;


    private TextView tv_back;


    private TextView tv_title;



    @Override


    protected void onCreate(Bundle savedInstanceState) {


        super.onCreate(savedInstanceState);


        requestWindowFeature(Window.FEATURE_NO_TITLE);


        setContentView(R.layout.activity_webview);


        initViews();


        initWebView();


    }



    private void initViews() {


        progress_bar = (ProgressBar) findViewById(R.id.progress_bar);


        webview = (WebView) findViewById(R.id.webview);


        tv_back = (TextView) findViewById(R.id.tv_back);


        tv_title = (TextView) findViewById(R.id.tv_title);


        tv_back.setOnClickListener(this);


        progress_bar.setIndeterminate(true);//自动在最小到最大值之间来回移动，不明确具体的值


        progress_bar.setVisibility(View.VISIBLE);


    }



    @SuppressLint("SetJavaScriptEnabled")


    private void initWebView() {


        webview.getSettings().setJavaScriptEnabled(true);//支持javascript。这个属性基本也是必须的，否则网页内容不会自适应手机屏幕


        webview.setWebViewClient(new MyWebViewClient(progress_bar));//在本WebView中显示网页内容。


        webview.addJavascriptInterface(new WebAppinterface(this), JS_INTERFACE);// 注册后可以在JS中调用此接口中定义的方法


        Intent intent = getIntent();


        if (intent != null) {


            String title = intent.getStringExtra(TITLE);


            if (!TextUtils.isEmpty(title)) tv_title.setText(title);


            String url = intent.getDataString();


            if (null != url && !"".equals(url)) {//防止空指针异常


                if (!url.startsWith("http://") && !url.startsWith("https://")) {


                    if (url.startsWith("www.")) webview.loadUrl("http://" + url); //以"www."开头，添加"http://"前缀


                    else webview.loadUrl("http://www.baidu.com.cn/s?wd=" + url);//使用百度搜索


                } else webview.loadUrl(url);//以"http://"开头，直接加载页面


            } else Toast.makeText(this, "请先输入网址", 0).show();


        }


    }



    @Override


    //点击后退按钮不退出Activity，而是让WebView后退一页。也可以通过webview.setOnKeyListener设置


    public boolean onKeyDown(int keyCode, KeyEvent event) {


        if (keyCode == KeyEvent.KEYCODE_BACK && webview.canGoBack()) {


            webview.goBack(); //后退，goForward() 前进  


            return true;


        }


        return super.onKeyDown(keyCode, event);


    }



    @Override


    protected void onDestroy() {


        super.onDestroy();


        if (webview != null) {


            webview.loadUrl("about:blank");


            webview.destroy();


        }


    }



    @Override


    public void onClick(View v) {


        switch (v.getId()) {


        case R.id.tv_back:


            finish();


            break;


        }


    }


}

代码-WebviewClint 



public class MyWebViewClient extends WebViewClient {


    private ProgressBar mProgressBar;



    public MyWebViewClient(ProgressBar mProgressBar) {


        super();


        this.mProgressBar = mProgressBar;


    }



    @Override


    //打开网页时不调用系统浏览器， 而是在本WebView中显示


    public boolean shouldOverrideUrlLoading(WebView view, String url) {


        view.loadUrl(url);


        return true;


    }



    @Override


    public void onPageStarted(WebView view, String url, Bitmap favicon) {


        mProgressBar.setVisibility(View.VISIBLE);


        super.onPageStarted(view, url, favicon);


    }



    @Override


    public void onPageFinished(WebView view, String url) {


        mProgressBar.setVisibility(View.GONE);


        super.onPageFinished(view, url);


    }


}

代码-JS调用接口 



/**


 * 在JS中可以调用此类中的方法


 */


public class WebAppinterface {


    private Activity mActivity;



    public WebAppinterface(Activity context) {


        this.mActivity = context;


    }



    public void recharge(int vipType) {


        Intent intent = new Intent(mActivity, Activity.class);


        Bundle mBundle = new Bundle();


        mBundle.putInt("item", vipType - 1);


        mActivity.startActivity(intent, mBundle);


    }


}

浏览器布局



<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"


    xmlns:tools="http://schemas.android.com/tools"


    android:layout_width="match_parent"


    android:layout_height="match_parent"


    android:orientation="vertical" >



    <RelativeLayout


        android:id="@+id/lk_activity_bar"


        android:layout_width="match_parent"


        android:layout_height="48dp"


        android:background="#ffa726" >



        <TextView


            android:id="@+id/tv_back"


            android:layout_width="wrap_content"


            android:layout_height="match_parent"


            android:layout_alignParentLeft="true"


            android:clickable="true"


            android:drawableLeft="@drawable/left_selector"


            android:drawablePadding="5dp"


            android:gravity="center|left"


            android:paddingLeft="15dp"


            android:text="返回"


            android:textColor="#fff"


            android:textSize="14sp" />



        <TextView


            android:id="@+id/tv_title"


            android:layout_width="wrap_content"


            android:layout_height="wrap_content"


            android:layout_centerInParent="true"


            android:text="活动详情"


            android:textColor="#fff"


            android:textSize="18sp" />


    </RelativeLayout>



    <FrameLayout


        android:layout_width="match_parent"


        android:layout_height="match_parent" >



        <WebView


            android:id="@+id/webview"


            android:layout_width="match_parent"


            android:layout_height="match_parent" />



        <ProgressBar


            android:id="@+id/progress_bar"


            style="?android:attr/progressBarStyle"


            android:layout_width="wrap_content"


            android:layout_height="wrap_content"


            android:layout_gravity="center"


            android:indeterminate="true"


            android:indeterminateDrawable="@drawable/progressbar_drawable"


            android:visibility="invisible" />


    </FrameLayout>



</LinearLayout>

清单文件



<?xml version="1.0" encoding="utf-8"?>


<manifest xmlns:android="http://schemas.android.com/apk/res/android"


    package="com.bqt.browser"


    android:versionCode="1"


    android:versionName="1.0" >



    <uses-sdk


        android:minSdkVersion="17"


        android:targetSdkVersion="17" />



    <uses-permission android:name="android.permission.INTERNET" />



    <application


        android:allowBackup="true"


        android:icon="@drawable/ic_launcher"


        android:label="浏览器App"


        android:theme="@android:style/Theme.Holo" >


        <activity


            android:name=".MainActivity"


            android:label="主页面" >


            <intent-filter>


                <action android:name="android.intent.action.MAIN" />



                <category android:name="android.intent.category.LAUNCHER" />


            </intent-filter>


        </activity>


        <activity


            android:name=".WebViewActivity"


            android:label="包青天的浏览器" >


            <intent-filter>


                <action android:name="android.intent.action.VIEW" />



                <category android:name="android.intent.category.DEFAULT" />


                <category android:name="android.intent.category.BROWSABLE" />



                <data android:scheme="http" />


                <data android:scheme="https" />


                <data android:scheme="about" />


                <data android:scheme="javascript" />


            </intent-filter>


        </activity>


    </application>



</manifest>

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