Webview内存泄漏与内存占用过大OOM的优化-白红宇的个人博客

发布日期：2022-02-25 00:55:13 浏览次数：49 分类：技术文章

本文共 3553 字，大约阅读时间需要 11 分钟。

1.首先不能直接在xml写webview组件，用FrameLayout做容器，java中动态添加：

FrameLayout ll = (FrameLayout) findViewById(R.id.content);//        wvContent = new WebView(getApplicationContext());        wvContent = new WebView(weakReference.get());        ll.addView(wvContent);

3.销毁时要先销毁外部的容器

：

@Override    protected void onDestroy() {        // Destroy the AdView.        if (wvContent != null) {            wvContent.removeAllViews();            ll.removeView(wvContent);            wvContent.destroy();        }        super.onDestroy();    }

4.再不行：

package com.mycompany.view;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.net.Uri;import android.util.AttributeSet;import android.webkit.WebView;import android.webkit.WebViewClient;public class NonLeakingWebView extends WebView {    private static Field sConfigCallback;    static {        try {            sConfigCallback = Class.forName("android.webkit.BrowserFrame").getDeclaredField("sConfigCallback");            sConfigCallback.setAccessible(true);        } catch (Exception e) {            // ignored        }    }    public NonLeakingWebView(Context context) {        super(context.getApplicationContext());        setWebViewClient( new MyWebViewClient((Activity)context) );    }    public NonLeakingWebView(Context context, AttributeSet attrs) {        super(context.getApplicationContext(), attrs);        setWebViewClient(new MyWebViewClient((Activity)context));    }    public NonLeakingWebView(Context context, AttributeSet attrs, int defStyle) {        super(context.getApplicationContext(), attrs, defStyle);        setWebViewClient(new MyWebViewClient((Activity)context));    }    @Override    public void destroy() {        super.destroy();        try {            if( sConfigCallback!=null )                sConfigCallback.set(null, null);        } catch (Exception e) {            throw new RuntimeException(e);        }    }    protected static class MyWebViewClient extends WebViewClient {        protected WeakReference
    
      activityRef;        public MyWebViewClient( Activity activity ) {            this.activityRef = new WeakReference
     
      (activity);        }        @Override        public boolean shouldOverrideUrlLoading(WebView view, String url) {            try {                final Activity activity = activityRef.get();                if( activity!=null )                    activity.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));            }catch( RuntimeException ignored ) {                // ignore any url parsing exceptions            }            return true;        }    }}

5.或者：通过反射清楚webview的内存占用

public void setConfigCallback(WindowManager windowManager) {    try {        Field field = WebView.class.getDeclaredField("mWebViewCore");        field = field.getType().getDeclaredField("mBrowserFrame");        field = field.getType().getDeclaredField("sConfigCallback");        field.setAccessible(true);        Object configCallback = field.get(null);        if (null == configCallback) {            return;        }        field = field.getType().getDeclaredField("mWindowManager");        field.setAccessible(true);        field.set(configCallback, windowManager);    } catch(Exception e) {    }}

在Activity中回调：

public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setConfigCallback((WindowManager)getApplicationContext().getSystemService(Context.WINDOW_SERVICE));}public void onDestroy() {    setConfigCallback(null);    super.onDestroy();}

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