Android 多窗口情况下，主题切换，不同步问题解决。

最近在项目中遇到一个多窗口情况下切换主题，两个界面主题切换速度不一样的情况，

如下图所示：打开一个小窗口，将设置运行在窗口下，在窗口下随便再打开一个应用。这种情况下切主题，会出现两个窗口主题切换速度不同步。

解决方案是在按下主题切换的按钮时，先截取当前屏幕，然后讲图片先铺在屏幕最上方，然后在背后切换主题，当主题切换完成之后再讲图片撤掉。

如下在按下按钮之后先去截屏，截屏之后创建一个弹窗，弹窗是一个全屏的，将截屏图片设置给弹窗背景，

        this.findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                
                //先去截屏，
                Bitmap bitmap = ScreenShortHelper.getInstence(MainActivity.this).captureScreenshot();
                Log.e(TAG, "Bitmap: "+bitmap);
                //转成Drawable
                BitmapDrawable drawable= new BitmapDrawable(bitmap);

                dialog = new Dialog(MainActivity.this);
                dialog.setContentView(R.layout.dialog_test_fullscreen);
                //给弹窗设置一个很高的层级。  TYPE_POINTER = FIRST_SYSTEM_WINDOW+18;
                dialog.getWindow().setType(2018);
                dialog.show();
                //将Drawable设置给Dialog的背景
                dialog.getWindow().setBackgroundDrawable(drawable);
                //设置Dialog为全屏
                dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

                //切换主题颜色
                mUiModeManager.setNightMode(UiModeManager.MODE_NIGHT_YES);
                //延迟1秒将弹窗消失掉。
                handler.sendEmptyMessageDelayed(1, 1000);
                Log.e(TAG, "onClick:UiModeManager.MODE_NIGHT_YES");

            }
        });

如下是截屏代码

    @SuppressLint("NewApi")
    public Bitmap captureScreenshot() {

        DisplayMetrics displayMetrics = new DisplayMetrics();

        Rect crop = new Rect(0, 0, displayMetrics.widthPixels, displayMetrics.heightPixels);

        mDisplayManager =context.getSystemService(DisplayManager.class);

        int width = crop.width();
        int height = crop.height();
        Bitmap screenshot = null;
        final Display display = mDisplayManager.getDisplay(DEFAULT_DISPLAY);
        final DisplayAddress address = display.getAddress();
        if (!(address instanceof DisplayAddress.Physical)) {
            Log.e(TAG, "Skipping Screenshot - Default display does not have a physical address: "
                    + display);
        } else {
            final DisplayAddress.Physical physicalAddress = (DisplayAddress.Physical) address;

            final IBinder displayToken = SurfaceControl.getPhysicalDisplayToken(
                    physicalAddress.getPhysicalDisplayId());
            final SurfaceControl.DisplayCaptureArgs captureArgs =
                    new SurfaceControl.DisplayCaptureArgs.Builder(displayToken)
                            .setSourceCrop(crop)
                            .setSize(width, height)
                            .build();
            final SurfaceControl.ScreenshotHardwareBuffer screenshotBuffer =
                    SurfaceControl.captureDisplay(captureArgs);
            screenshot = screenshotBuffer == null ? null : screenshotBuffer.asBitmap();
        }
        return screenshot;
    }

截屏的代码是系统@hide的api，代码要跟着系统源码进行编译。

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional

LOCAL_SRC_FILES := $(call all-java-files-under, src/main)

LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/src/main/res

LOCAL_CERTIFICATE := platform
LOCAL_PRIVILEGED_MODULE := true
LOCAL_PROGUARD_ENABLED := disabled
LOCAL_PROGUARD_FLAG_FILES := proguard-rules.pro

LOCAL_MANIFEST_FILE := src/main/AndroidManifest.xml

LOCAL_STATIC_JAVA_LIBRARIES += androidx.appcompat_appcompat

LOCAL_PRIVATE_PLATFORM_APIS := true

LOCAL_PACKAGE_NAME := MyApplication
include $(BUILD_PACKAGE)

代码下载路径：

https://github.com/hoolwei/ThemeSwitch

Android 多窗口情况下，主题切换，不同步问题解决。

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