Android WebView 進度條+滑動刷新

Question

我是 Android JAVA 編程的新手，試圖讓這個代碼工作。 我嘗試了 StackOverflow 的所有組合，這是我得到的最好的。 我設法讓 webView 和 SwipeRefresh 工作，但水平進度條不起作用，我不知道為什么。 它只是在我刷新時不顯示。 這是代碼

activity_main.xml

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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=".MainActivity"> <ProgressBar android:id="@+id/progressbar" style="@android:style/Widget.ProgressBar.Horizontal" android:layout_width="match_parent" android:layout_height="3dp" /> <androidx.swiperefreshlayout.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/swiperefreshlayout" 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:layout_centerInParent="true" /> </androidx.swiperefreshlayout.widget.SwipeRefreshLayout> </RelativeLayout>

MainActivity.java

 package com.example.test; import android.graphics.Bitmap; import androidx.swiperefreshlayout.widget.SwipeRefreshLayout; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.webkit.WebChromeClient; import android.webkit.WebResourceRequest; import android.webkit.WebSettings; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.ProgressBar; public class MainActivity extends AppCompatActivity { SwipeRefreshLayout swipeRefreshLayout; ProgressBar progressBar; WebView webView; String url = "https://www.google.com"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initControls(); } private void initControls() { swipeRefreshLayout = findViewById(R.id.swiperefreshlayout); progressBar = findViewById(R.id.progressbar); webView = findViewById(R.id.webView); //setting webviewclient webView.setWebViewClient(new WebViewClient() { @Override public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) { //To open hyperlink in existing WebView view.loadUrl(request.getUrl().toString()); return false; } @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { progressBar.setVisibility(View.VISIBLE); progressBar.setProgress(0); } @Override public void onPageFinished(WebView view, String url) { progressBar.setVisibility(View.GONE); swipeRefreshLayout.setRefreshing(false); } }); //setting webchromeclient webView.setWebChromeClient(new WebChromeClient(){ @Override public void onProgressChanged(WebView webView, int newProgress) { progressBar.setProgress(newProgress); } }); //setting other settings webView.getSettings().setJavaScriptEnabled(true); webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY); webView.getSettings().setBuiltInZoomControls(false); webView.getSettings().setLoadsImagesAutomatically(true); webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); webView.getSettings().setDomStorageEnabled(true); webView.loadUrl(url); //setting swiperefreshlistener swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { webView.reload(); } }); } public void onBackPressed (){ if (webView.canGoBack()) { webView.goBack(); } else { super.onBackPressed(); } } }

AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.test"> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <application android:usesCleartextTraffic="true" android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>

謝謝

Answer 1

你的進度條在 webview 后面

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">
    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/swiperefreshlayout"
        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:layout_centerInParent="true" />
    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

    <ProgressBar
        android:id="@+id/progressbar"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="3dp"
        android:visibility="gone"
        tools:visibility="visible" />
</RelativeLayout>