如何在WebView中添加进度/加载栏

Question

我为企业主开发了一个网站，并且几乎只使用PHP

所以Java语言（和android studio）对我来说真的很新

尽管如此，我必须创建一个APK以使用该网站（以阻止此网站上的android home）

目前，我设法设置了刷新页面，现在我正尝试向使用WebView的应用程序中添加进度/加载栏，但它不起作用..

MainActivity.java

import android.support.v4.widget.SwipeRefreshLayout;
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

    WebView webView;

    SwipeRefreshLayout swipe;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        swipe = (SwipeRefreshLayout) findViewById(R.id.swipe);
        swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                webView.reload();
            }
        });

        LoadWeb();

    }


    public void LoadWeb(){

        webView = (WebView) findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setAppCacheEnabled(true);
        webView.loadUrl("https://www.google.com/");
        swipe.setRefreshing(true);
        webView.setWebViewClient(new WebViewClient(){

            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {

                webView.loadUrl("file:///android_asset/error.html");
            }

            public  void onLoadResource(WebView view, String url) { //Doesn't work
                swipe.setRefreshing(true);
            }

            public  void  onPageFinished(WebView view, String url){

                //Hide the SwipeReefreshLayout

                swipe.setRefreshing(false);
            }

        });
    }

    @Override
    public void onBackPressed(){

        if (webView.canGoBack()){
            webView.goBack();
        }else {
            finish();
        }
    }
}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context="eu.test.testappli.MainActivity">

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe"
        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"/>

    </android.support.v4.widget.SwipeRefreshLayout>

</android.support.constraint.ConstraintLayout>

看起来似乎很简单，但是Java对我来说仍然晦涩难懂，因此我无法实现在网上找到的代码段。

Answer 1

试试这个，我在您的代码中做了一些更改

import android.support.v4.widget.SwipeRefreshLayout;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.support.v7.widget.Toolbar;
public class Main2Activity extends AppCompatActivity {

    WebView webView;

    SwipeRefreshLayout swipe;
    ProgressBar progressBar;
    Toolbar toolbar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        progressBar = (ProgressBar) findViewById(R.id.awv_progressBar);
        swipe = (SwipeRefreshLayout) findViewById(R.id.swipe);
        LoadWeb();

        progressBar.setMax(100);
        progressBar.setProgress(1);


        swipe = (SwipeRefreshLayout) findViewById(R.id.swipe);
        swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                webView.reload();
            }
        });

        webView.setWebChromeClient(new WebChromeClient() {
            public void onProgressChanged(WebView view, int progress) {


                progressBar.setProgress(progress);
            }
        });

        webView.setWebViewClient(new WebViewClient() {


            @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            progressBar.setVisibility(View.VISIBLE);
        }


            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {

                webView.loadUrl("file:///android_asset/error.html");
            }

            public void onLoadResource(WebView view, String url) { //Doesn't work
                //swipe.setRefreshing(true);
            }

            public void onPageFinished(WebView view, String url) {

                //Hide the SwipeReefreshLayout
                progressBar.setVisibility(View.GONE);
                swipe.setRefreshing(false);
            }

        });


    }

    public void LoadWeb() {

        webView = (WebView) findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setAppCacheEnabled(true);
        webView.loadUrl("https://www.google.com/");
        swipe.setRefreshing(true);
    }

    @Override
    public void onBackPressed() {

        if (webView.canGoBack()) {
            webView.goBack();
        } else {
            finish();
        }
    }

}

XML.LAYOUT

<?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:id="@+id/rel_parent"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Main2Activity">



    <ProgressBar
        android:id="@+id/awv_progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="15dp"
        android:layout_marginTop="7dp"
        android:indeterminate="true" />


    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe"
        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" />

    </android.support.v4.widget.SwipeRefreshLayout>


</LinearLayout>

将此主题添加到您的活动中

<style name="AppTheme3" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

OUTPUT

Answer 2

这可能对您有帮助。

在WebViewClient内部：

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

      super.onPageStarted(view, url, favicon);
      findViewById(R.id.progress1).setVisibility(View.VISIBLE);
     }

    @Override
    public void onPageFinished(WebView view, String url) {
        findViewById(R.id.progress1).setVisibility(View.GONE);
    }

在XML中添加以下内容：

<ProgressBar
    android:id="@+id/progress1"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

Answer 3

我认为您最好的选择是使用Cordova。 将您的网站包含在其中，然后像Android应用一样对其进行编译。

Answer 4

您需要在WebView上设置ProgressBar ，看看我做的代码。

这是我的activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity">

    <WebView
        android:id="@+id/webView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerHorizontal="true" />

    <ProgressBar
        android:id="@+id/progressBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />
</RelativeLayout>

在MainActivity.java中，我已经处理过ProgressBar的显示/隐藏功能。

MainActivity.java

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webview = findViewById(R.id.webView1);
        pbar =  findViewById(R.id.progressBar1);
        webview.setWebViewClient(new WebViewClient());
        webview.loadUrl("https://www.ndtv.com/");
    }

    public class WebViewClient extends android.webkit.WebViewClient {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);

            /*** Hide ProgressBar while page completely load ***/
            pbar.setVisibility(View.GONE);

        }

    }

检查结果，

加载页面时可见ProgressBar

URL完全加载时，ProgressBar将隐藏

Answer 5

在XML文件中：-

<ProgressBar
    android:id="@+id/mProgressBar"
    style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

在MainActivity中：

        webView.setWebChromeClient(new WebChromeClient(){
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            super.onProgressChanged(view, newProgress);
            mProgressBar.setProgress(newProgress);
        }

        webView.setWebViewClient(new WebViewClient(){
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String request)
        {
            webView.loadUrl(request);
            return true;
        }
        public void onPageFinished(WebView view, String url) {
            mProgressBar.setVisibility(View.GONE);
            super.onPageFinished(view, url);
        }

在这里，您将获得完整的Webview代码。 https://github.com/Talha609/Android-WebView-PDF-ProgressBar