{"id":540,"date":"2022-12-29T11:14:40","date_gmt":"2022-12-29T03:14:40","guid":{"rendered":"https:\/\/iichen.cn\/?p=540"},"modified":"2022-12-29T11:14:40","modified_gmt":"2022-12-29T03:14:40","slug":"android-fragment%e7%8a%b6%e6%80%81%e4%bf%9d%e5%ad%98%e5%92%8c%e6%81%a2%e5%a4%8d","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=540","title":{"rendered":"Android-\u5c0f\u70b9\u8bb0\u5f55"},"content":{"rendered":"<h4>1. Fragment\u72b6\u6001\u4fdd\u5b58\u548c\u6062\u590d<\/h4>\n<blockquote><p>\n  \u53ef\u4ee5\u53c2\u8003ViewPager\u7684FragmentStatePagerAdapter\u9002\u914d\u5668\u4e2d\u7684\u5904\u7406\n<\/p><\/blockquote>\n<pre><code class=\"language-java line-numbers\">\/\/ \u4fdd\u5b58\nFragmentManager.saveFragmentInstanceState(fragment)\n\/\/ \u8fd8\u539f\nFragment.setInitialSavedState(SavedState)\n<\/code><\/pre>\n<h4>2. App \u9ed1\u767d\u5316\u5f15\u7533<\/h4>\n<blockquote><p>\n  \u7236 View \u7684 Canvas \u548c Paint \u662f\u5f80\u4e0b\u5206\u53d1\u7684.\u6240\u4ee5\u4fee\u6539\u7236View\u5373\u53ef(DecorView)\n<\/p><\/blockquote>\n<pre><code class=\"language-java line-numbers\">\/\/\u65b0\u5efa\u4e00\u652f\u753b\u7b14\nval paint = Paint()\n\/\/\u901a\u8fc7 ColorMatrix \u5c06\u9971\u548c\u5ea6\u8bbe\u7f6e\u4e3a 0\nval cm = ColorMatrix()\ncm.setSaturation(0f)\n\/\/\u5c06\u753b\u7b14\u7684\u8272\u5f69\u9971\u548c\u5ea6\u8bbe\u7f6e\u4e3a 0\npaint.colorFilter = ColorMatrixColorFilter(cm)\n<\/code><\/pre>\n<ul>\n<li>window.decorView.setLayerType(View.LAYER_TYPE_HARDWARE,paint)<\/li>\n<li>Application \u4e2d\u6ce8\u518c registerActivityLifecycleCallbacks \u56de\u8c03\uff0c\u56de\u8c03\u4e2d\u901a\u8fc7 activity \u5b9e\u4f8b\u540c\u6837\u53ef\u4ee5\u62ff\u5230 DecorView<\/li>\n<\/ul>\n<h5>2.1 \u66ff\u6362\u7cfb\u7edf\u7684 R.id.content \u5bb9\u5668Fragment<\/h5>\n<pre><code class=\"language-java line-numbers\">public class GrayFrameLayout extends FrameLayout {\n    private Paint mPaint = new Paint();\n\n    public GrayFrameLayout(Context context, AttributeSet attrs) {\n        super(context, attrs);\n\n        ColorMatrix cm = new ColorMatrix();\n        cm.setSaturation(0);\n        mPaint.setColorFilter(new ColorMatrixColorFilter(cm));\n    }\n\n    @Override\n    protected void dispatchDraw(Canvas canvas) {\n        canvas.saveLayer(null, mPaint, Canvas.ALL_SAVE_FLAG);\n        super.dispatchDraw(canvas);\n        canvas.restore();\n    }\n\n\n    @Override\n    public void draw(Canvas canvas) {\n        canvas.saveLayer(null, mPaint, Canvas.ALL_SAVE_FLAG);\n        super.draw(canvas);\n        canvas.restore();\n    }\n}\n\/\/ BaseActivity\n@Override\npublic View onCreateView(String name, Context context, AttributeSet attrs) {\n    try {\n        if (\"FrameLayout\".equals(name)) {\n            int count = attrs.getAttributeCount();\n            for (int i = 0; i &lt; count; i++) {\n                String attributeName = attrs.getAttributeName(i);\n                String attributeValue = attrs.getAttributeValue(i);\n                if (attributeName.equals(\"id\")) {\n                    int id = Integer.parseInt(attributeValue.substring(1));\n                    String idVal = getResources().getResourceName(id);\n                    if (\"android:id\/content\".equals(idVal)) {\n                        GrayFrameLayout grayFrameLayout = new GrayFrameLayout(context, attrs);\n\/\/                            grayFrameLayout.setWindow(getWindow());\n                        return grayFrameLayout;\n                    }\n                }\n            }\n        }\n    } catch (Exception e) {\n        e.printStackTrace();\n    }\n    return super.onCreateView(name, context, attrs);\n}\n<\/code><\/pre>\n<h5>2.2 Hook\u53cd\u5c04\u66ff\u6362WindowManagerGlobal\u5185\u7684mViews\u5bb9\u5668<\/h5>\n<pre><code class=\"language-java line-numbers\">\/\/ \u8f6c\u8f7d\u81eaU2tzJTNE\n\/\/ https:\/\/juejin.cn\/post\/6892277675012915207\npublic static void enable(boolean enable) {\n    try {\n        \/\/\u7070\u8272\u8c03Paint\n        final Paint mPaint = new Paint();\n        ColorMatrix mColorMatrix = new ColorMatrix();\n        mColorMatrix.setSaturation(enable ? 0 : 1);\n        mPaint.setColorFilter(new ColorMatrixColorFilter(mColorMatrix));\n\n        \/\/\u53cd\u5c04\u83b7\u53d6windowManagerGlobal\n        @SuppressLint(\"PrivateApi\")\n        Class&lt;?&gt; windowManagerGlobal = Class.forName(\"android.view.WindowManagerGlobal\");\n        @SuppressLint(\"DiscouragedPrivateApi\")\n        java.lang.reflect.Method getInstanceMethod = windowManagerGlobal.getDeclaredMethod(\"getInstance\");\n        getInstanceMethod.setAccessible(true);\n        Object windowManagerGlobalInstance = getInstanceMethod.invoke(windowManagerGlobal);\n\n        \/\/\u53cd\u5c04\u83b7\u53d6mViews\n        Field mViewsField = windowManagerGlobal.getDeclaredField(\"mViews\");\n        mViewsField.setAccessible(true);\n        Object mViewsObject = mViewsField.get(windowManagerGlobalInstance);\n\n        \/\/\u521b\u5efa\u5177\u6709\u6570\u636e\u611f\u77e5\u80fd\u529b\u7684ObservableArrayList\n        ObservableArrayList&lt;View&gt; observerArrayList = new ObservableArrayList&lt;&gt;();\n        observerArrayList.addOnListChangedListener(new ObservableArrayList.OnListChangeListener() {\n            @Override\n            public void onChange(ArrayList list, int index, int count) {\n            }\n\n            @Override\n            public void onAdd(ArrayList list, int start, int count) {\n                \/\/ \u62ff\u5230DecorView\u89e6\u53d1\u91cd\u7ed8\n                View view = (View) list.get(start);\n                if (view != null) {\n                    view.setLayerType(View.LAYER_TYPE_HARDWARE, mPaint);\n                }\n            }\n\n            @Override\n            public void onRemove(ArrayList list, int start, int count) {\n            }\n        });\n        \/\/\u5c06\u539f\u6709\u7684\u6570\u636e\u6dfb\u52a0\u5230\u65b0\u521b\u5efa\u7684list\n        observerArrayList.addAll((ArrayList&lt;View&gt;) mViewsObject);\n        \/\/\u66ff\u6362\u6389\u539f\u6709\u7684mViews\n        mViewsField.set(windowManagerGlobalInstance, observerArrayList);\n    } catch (Exception e) {\n        e.printStackTrace();\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1. Fragment\u72b6\u6001\u4fdd\u5b58\u548c\u6062\u590d \u53ef\u4ee5\u53c2\u8003ViewPager\u7684FragmentStatePagerAdap [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,8],"tags":[],"class_list":["post-540","post","type-post","status-publish","format-standard","hentry","category-android","category-8"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Android-\u5c0f\u70b9\u8bb0\u5f55 - IIchen<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/iichen.cn\/?p=540\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Android-\u5c0f\u70b9\u8bb0\u5f55 - IIchen\" \/>\n<meta property=\"og:description\" content=\"1. 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