android.webkit.WebView#destroy ( )源码实例Demo

public void destroyWebView(WebView mWebView) {
    if (mWebView != null) {
        try {
            ViewParent parent = mWebView.getParent();
            if (parent != null) {
                ((ViewGroup) parent).removeView(mWebView);
            }
            mWebView.stopLoading();
            mWebView.getSettings().setJavaScriptEnabled(false);
            mWebView.clearHistory();
            mWebView.clearView();
            mWebView.removeAllViews();

            mWebView.destroy();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

static final void clearWebView(WebView m) {
	if (m == null) {
		return;
	}
	if (Looper.myLooper() != Looper.getMainLooper()) {
		return;
	}
	m.loadUrl("about:blank");
	m.stopLoading();
	if (m.getHandler() != null) {
		m.getHandler().removeCallbacksAndMessages(null);
	}
	m.removeAllViews();
	ViewGroup mViewGroup = null;
	if ((mViewGroup = ((ViewGroup) m.getParent())) != null) {
		mViewGroup.removeView(m);
	}
	m.setWebChromeClient(null);
	m.setWebViewClient(null);
	m.setTag(null);
	m.clearHistory();
	m.destroy();
	m = null;
}
 

private void clearCache() {
    WebView webView = new WebView(mActivity);
    webView.clearCache(true);
    webView.destroy();
    Utils.showSnackbar(mActivity, R.string.message_cache_cleared);
}
 

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    final String userAgent = PreferenceManager.getDefaultSharedPreferences(getActivity()).getString(getString(R.string.user_agent_pref), null);
    if (userAgent != null) {
        RequestQueueUtil.getInstance().setUserAgent(userAgent);
    } else {
        try {
            final WebView webView = new WebView(getActivity());
            final String webViewAgent = webView.getSettings().getUserAgentString();

            PreferenceManager.getDefaultSharedPreferences(getActivity()).edit().putString(getString(R.string.user_agent_pref), webViewAgent).apply();
            webView.destroy();
        } catch (Exception e) {

            if (PreferenceManager.getDefaultSharedPreferences(getActivity()).getString(getString(R.string.user_agent_pref), null) == null) {
                final String defaultAgent = System.getProperty("http.agent");
                PreferenceManager.getDefaultSharedPreferences(getActivity()).edit().putString(getString(R.string.user_agent_pref), defaultAgent).apply();
            }
        }
    }

    if (getActivity() instanceof MimiActivity) {
        toolbar = ((MimiActivity) getActivity()).getToolbar();
    }

    rootView = inflater.inflate(R.layout.fragment_boards_list, container, false);
    errorSwitcher = rootView.findViewById(R.id.error_switcher);

    boardListAdapter = new BoardListAdapter(getActivity(), new ArrayList<>());

    final LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    boardsList = rootView.findViewById(R.id.boards_list);
    boardsList.addItemDecoration(new DividerItemDecoration(boardsList.getContext(), RecyclerView.VERTICAL));
    boardsList.setLayoutManager(layoutManager);
    boardsList.setAdapter(boardListAdapter);
    boardListAdapter.setDragListener(viewHolder -> itemTouchHelper.startDrag(viewHolder));
    boardListAdapter.setOnItemLongClickListener((parent, view, position, id) -> {
        if (getActivity() != null) {
            getActivity().startActionMode(getActionMode());
        }
        return true;
    });
    return rootView;
}
 

private void countDownAndDestroy(WebView view) {
	latch.countDown();
	view.destroy();
}
 

private void clearCache() {
    WebView webView = new WebView(mActivity);
    webView.clearCache(true);
    webView.destroy();
    Utils.showSnackbar(mActivity, R.string.message_cache_cleared);
}