Android WebView进度条 + 下拉刷新

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英文:

Android WebView Progress bar + Swipe Refresh

问题

I am new on Android JAVA programming, trying to make this code to work. I tried all the combinations from StackOverflow, and this is the best I got. I manage to get webView and SwipeRefresh to work, but the horizontal progress bar doesn't work, and I don't know why. It just doesn't show when I refresh. Here is the code

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>
英文:

I am new on Android JAVA programming, trying to make this code to work. I tried all the combinations from StackOverflow, and this is the best I got. I manage to get webView and SwipeRefresh to work, but the horizontal progress bar doesn't work, and I don't know why. It just doesn't show when I refresh. Here is the code

activity_main.xml

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
xmlns:tools=&quot;http://schemas.android.com/tools&quot;
android:layout_width=&quot;match_parent&quot;
android:layout_height=&quot;match_parent&quot;
tools:context=&quot;.MainActivity&quot;&gt;
&lt;ProgressBar
android:id=&quot;@+id/progressbar&quot;
style=&quot;@android:style/Widget.ProgressBar.Horizontal&quot;
android:layout_width=&quot;match_parent&quot;
android:layout_height=&quot;3dp&quot; /&gt;
&lt;androidx.swiperefreshlayout.widget.SwipeRefreshLayout
xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
android:id=&quot;@+id/swiperefreshlayout&quot;
android:layout_width=&quot;match_parent&quot;
android:layout_height=&quot;match_parent&quot;&gt;
&lt;WebView
android:id=&quot;@+id/webView&quot;
android:layout_width=&quot;match_parent&quot;
android:layout_height=&quot;match_parent&quot;
android:layout_centerInParent=&quot;true&quot; /&gt;
&lt;/androidx.swiperefreshlayout.widget.SwipeRefreshLayout&gt;
&lt;/RelativeLayout&gt;

<!-- end snippet -->

MainActivity.java

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

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 = &quot;https://www.google.com&quot;;
@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();
}
}
}

<!-- end snippet -->

AndroidManifest.xml

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

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

<!-- end snippet -->

Thanks

答案1

得分: 2

您的进度条在WebView后面。

英文:

Your progressbar is behind the webview

&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
    xmlns:tools=&quot;http://schemas.android.com/tools&quot;
    android:layout_width=&quot;match_parent&quot;
    android:layout_height=&quot;match_parent&quot;
    tools:context=&quot;.MainActivity&quot;&gt;
    &lt;androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:id=&quot;@+id/swiperefreshlayout&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;&gt;

    &lt;WebView
        android:id=&quot;@+id/webView&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        android:layout_centerInParent=&quot;true&quot; /&gt;
    &lt;/androidx.swiperefreshlayout.widget.SwipeRefreshLayout&gt;

    &lt;ProgressBar
        android:id=&quot;@+id/progressbar&quot;
        style=&quot;@android:style/Widget.ProgressBar.Horizontal&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;3dp&quot;
        android:visibility=&quot;gone&quot;
        tools:visibility=&quot;visible&quot; /&gt;
&lt;/RelativeLayout&gt;

huangapple
  • 本文由 发表于 2020年7月29日 10:06:10
  • 转载请务必保留本文链接:https://go.coder-hub.com/63145284.html
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