android.webkit.WebSettings#setDefaultZoom ( )源码实例Demo

private void initSize(WebSettings settings) {
    int   screenDensity   = getResources().getDisplayMetrics(). densityDpi ;
    WebSettings.ZoomDensity   zoomDensity   = WebSettings.ZoomDensity. MEDIUM ;
    switch (screenDensity){
        case   DisplayMetrics.DENSITY_LOW :
            zoomDensity = WebSettings.ZoomDensity.CLOSE;
            break ;
        case   DisplayMetrics.DENSITY_MEDIUM :
            zoomDensity = WebSettings.ZoomDensity.MEDIUM;
            break ;
        case   DisplayMetrics.DENSITY_HIGH :
            zoomDensity = WebSettings.ZoomDensity.FAR;
            break ;
    }
    settings.setDefaultZoom(zoomDensity) ;
}
 

public static void setDefaultZoom(WebSettings settings, ZoomDensityCompat zoom) {
	switch (zoom) {
	case FAR: {
		settings.setDefaultZoom(ZoomDensity.FAR);
		break;
	}
	case MEDIUM: {
		settings.setDefaultZoom(ZoomDensity.MEDIUM);
		break;
	}
	case CLOSE: {
		settings.setDefaultZoom(ZoomDensity.CLOSE);
		break;
	}
	default: {
		break;
	}
	}
}
 

private void initWebSettings() {
    WebSettings webSettings = webViewT.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setBuiltInZoomControls(true);
    webSettings.setSupportZoom(true);
    webSettings.setDisplayZoomControls(false);
    webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    webSettings.setAllowFileAccess(true);
    webSettings.setDefaultTextEncodingName("UTF-8");
    webSettings.setLoadWithOverviewMode(true);
    webSettings.setUseWideViewPort(true);
    webSettings.setDomStorageEnabled(true);
    webSettings.setAppCacheMaxSize(1024 * 1024 * 8);
    String appCachePath = getApplicationContext().getCacheDir().getAbsolutePath();
    webSettings.setAppCachePath(appCachePath);
    webSettings.setAllowFileAccess(true);
    webSettings.setAppCacheEnabled(true);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
    }
    webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
    DisplayMetrics metrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(metrics);
    int mDensity = metrics.densityDpi;
    if (mDensity == 240) {
        webSettings.setDefaultZoom(WebSettings.ZoomDensity.FAR);
    } else if (mDensity == 160) {
        webSettings.setDefaultZoom(WebSettings.ZoomDensity.MEDIUM);
    } else if (mDensity == 120) {
        webSettings.setDefaultZoom(WebSettings.ZoomDensity.CLOSE);
    } else if (mDensity == DisplayMetrics.DENSITY_XHIGH) {
        webSettings.setDefaultZoom(WebSettings.ZoomDensity.FAR);
    } else if (mDensity == DisplayMetrics.DENSITY_TV) {
        webSettings.setDefaultZoom(WebSettings.ZoomDensity.FAR);
    } else {
        webSettings.setDefaultZoom(WebSettings.ZoomDensity.MEDIUM);
    }
}
 

private void init() {
        mWebView.setWebViewClient(webViewClient);
//        mWebView.setWebChromeClient(chromeClient);
        WebSettings settings = mWebView.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
        settings.setDefaultZoom(WebSettings.ZoomDensity.FAR);

        settings.setSupportZoom(true);
        settings.setBuiltInZoomControls(true);
        settings.setAppCacheEnabled(false);
        settings.setSavePassword(false);

        mWebView.loadUrl(mUrl);
    }
 

@SuppressWarnings("deprecation")
@SuppressLint("SetJavaScriptEnabled")
public static void loadUrlAdaptiveScreen(Context mContext, WebView webview,
                                         String url, boolean javaScriptEnabled) {
    WebSettings webSettings = webview.getSettings();
    webSettings.setJavaScriptEnabled(javaScriptEnabled);
    // 自适应屏幕
    // 第一种：
    // WebSetting settings = webView.getSettings();
    // settings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);
    // 把所有内容放在webview等宽的一列中。（可能会出现页面中链接失效）
    // 第二种：
    // settings.setUseWideViewPort(true);
    // settings.setLoadWithOverviewMode(true);
    // 第三种：
    DisplayMetrics metrics = new DisplayMetrics();
    ((Activity) mContext).getWindowManager().getDefaultDisplay()
            .getMetrics(metrics);
    int mDensity = metrics.densityDpi;
    if (mDensity <= 120) {
        webSettings.setDefaultZoom(ZoomDensity.CLOSE);
    } else if (mDensity > 120 && mDensity < 240) {
        webSettings.setDefaultZoom(ZoomDensity.MEDIUM);
    } else if (mDensity >= 240) {
        webSettings.setDefaultZoom(ZoomDensity.FAR);
    }

    webview.setWebViewClient(new WebViewClient());
    webview.loadUrl(url);

}
 

public EditAreaView(Context context, AttributeSet attrs) {
        super(context, attrs);

        if (L.debug) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                setWebContentsDebuggingEnabled(true);
            }
        }

        setLongClickable(false);
        setOnLongClickListener(new OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                return true;
            }
        });

        WebSettings ws = getSettings();
        ws.setDefaultZoom(WebSettings.ZoomDensity.FAR);
        ws.setAllowContentAccess(true);
        ws.setAllowFileAccess(true);
        ws.setBuiltInZoomControls(false);
        ws.setDefaultTextEncodingName("utf-8");
        ws.setDisplayZoomControls(false);
        ws.setSupportZoom(false);
        ws.setLoadWithOverviewMode(false);

        ws.setJavaScriptEnabled(true);
        ws.setAppCacheEnabled(false);
        ws.setDomStorageEnabled(true);
        ws.setAppCacheMaxSize(1024*1024*80);
        ws.setAppCachePath(context.getCacheDir().getPath());
//        ws.setAllowFileAccess(true);
        ws.setCacheMode(WebSettings.LOAD_DEFAULT);

        addJavascriptInterface(new JavascriptApi(), "AndroidEditor");

        setWebViewClient(new EditorViewClient());
        setWebChromeClient(new EditorViewChromeClient());

        pref = Pref.getInstance(getContext());
        ThemeList.Theme theme = pref.getThemeInfo();
        boolean isDark = false;
        if (theme != null) {
            isDark = theme.isDark;
        }

        String html = null;

        try {
            InputStream is = getContext().getAssets().open("editor.html");
            html = IOUtils.readFile(is, "utf-8");
            is.close();
        } catch (Exception e) {
            L.e(e);
            UIUtils.toast(getContext(), R.string.editor_create_unknown_exception);
            return;
        }

        if (!isDark)
            html = html.replaceAll("<\\!\\-\\-\\{DARK\\-START\\}\\-\\->[\\w\\W]+?<\\!\\-\\-\\{DARK\\-END\\}\\-\\->", "");

        loadDataWithBaseURL("file:///android_asset/", html, "text/html", "utf-8", "file:///android_asset/");
        //fix dark theme background spark
        setBackgroundColor(Color.TRANSPARENT);

        pref.registerOnSharedPreferenceChangeListener(this);
        onSharedPreferenceChanged(null, Pref.KEY_FONT_SIZE);
        onSharedPreferenceChanged(null, Pref.KEY_CURSOR_WIDTH);
        onSharedPreferenceChanged(null, Pref.KEY_SHOW_LINE_NUMBER);
        onSharedPreferenceChanged(null, Pref.KEY_WORD_WRAP);
        onSharedPreferenceChanged(null, Pref.KEY_SHOW_WHITESPACE);
        onSharedPreferenceChanged(null, Pref.KEY_TAB_SIZE);
        onSharedPreferenceChanged(null, Pref.KEY_AUTO_INDENT);
        onSharedPreferenceChanged(null, Pref.KEY_AUTO_CAPITALIZE);
        onSharedPreferenceChanged(null, Pref.KEY_INSERT_SPACE_FOR_TAB);
        onSharedPreferenceChanged(null, Pref.KEY_THEME);
        onSharedPreferenceChanged(null, Pref.KEY_TOUCH_TO_ADJUST_TEXT_SIZE);
        enableHighlight(pref.isHighlight());
        setReadOnly(pref.isReadOnly());
    }
 

@SuppressWarnings("deprecation")
@TargetApi(Build.VERSION_CODES.ECLAIR_MR1)
public static void setDefaultZoomFAR(WebSettings settings) {
    settings.setDefaultZoom(WebSettings.ZoomDensity.FAR);
}
 

@SuppressWarnings("deprecation")
@TargetApi(Build.VERSION_CODES.ECLAIR_MR1)
public static void setDefaultZoomCLOSE(WebSettings settings) {
    settings.setDefaultZoom(WebSettings.ZoomDensity.CLOSE);
}
 

@SuppressWarnings("deprecation")
@TargetApi(Build.VERSION_CODES.ECLAIR_MR1)
public static void setDefaultZoomMEDIUM(WebSettings settings) {
    settings.setDefaultZoom(WebSettings.ZoomDensity.MEDIUM);
}