java - 为android webview java添加进度条

Question

请我在android开发方面非常新，我有我的网站，我在webview中加载并且现在正在工作我想添加一个进度条来显示链接何时处理以渲染并在页面加载后隐藏进度条。 请我看到很多例子，但我在尝试实现它时不断遇到错误，请有人帮助我使用我自己的 webview 例如。

package com.mypage.mypage;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;


public class SourceProjectActivity extends AppCompatActivity {

    private WebView projectLoaderView;
    private ProgressBar progress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_source_project);
        projectLoaderView = (WebView)findViewById(R.id.sourcejailview);
        WebSettings webSettings = projectLoaderView.getSettings();

        progress = (ProgressBar) findViewById(R.id.progressBar);
        progress.setMax(100);

        webSettings.setJavaScriptEnabled(true);
        webSettings.setSaveFormData(true);
        webSettings.setDatabaseEnabled(true);
        webSettings.setDomStorageEnabled(true);
        //local offline loader
        webSettings.setCacheMode( WebSettings.LOAD_DEFAULT );

        projectLoaderView.loadUrl("http://google.com");
        projectLoaderView.setWebViewClient(new WebViewClient());
        SourceProjectActivity.this.progress.setProgress(0);
    }

    private class MyWebViewClient extends WebViewClient {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            //super.onProgressChanged(view, newProgress);
        }
    }

    public void setValue(int progress) {
        this.progress.setProgress(progress);
    }

    @Override
    public void onBackPressed(){
        if(projectLoaderView.canGoBack()){
            projectLoaderView.goBack();
        }else {
            super.onBackPressed();
        }
    }

}

这是我的 xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app=""
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_source_project"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.mypage.mypage.SourceProjectActivity">

    <WebView
        android:id="@+id/sourcejailview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true" >

        <ProgressBar
            style="@android:style/Widget.Material.Light.ProgressBar.Small"
            android:layout_width="match_parent"
            android:layout_x="124dp"
            android:layout_y="43dp"
            android:id="@+id/progressBar"
            android:layout_height="wrap_content" />
    </WebView>
</RelativeLayout>

Answer 1

WebViewClient 没有 onProgressChanged() 方法。相反，您可以使用 WebChromeClient 并设置进度条，如下所示:

private class MyWebViewClient extends WebViewClient {
        public void onProgressChanged(WebView view, int newProgress) {
                progress.setProgress(newProgress);
                //Maybe you want to hide it once it reaches 100
                if (newProgress == 100){
                       progress.setVisibility(ProgressBar.GONE);
                }
        }
}