Android 壁纸横屏显示一半黑屏

Posted 2021-06-08 虫师魁拔

问题定位是 *大师手机APP 设置壁纸导致。

系统裁剪显示静态壁纸的类 SystemUI/src/com/android/systemui/ImageWallpaper.java 

        boolean updateSurfaceSize(SurfaceHolder surfaceHolder, DisplayInfo displayInfo,
                boolean forDraw) {
            boolean hasWallpaper = true;

            // Load background image dimensions, if we haven't saved them yet
            if (mBackgroundWidth <= 0 || mBackgroundHeight <= 0) {
                // Need to load the image to get dimensions
                loadWallpaper(forDraw);
                if (DEBUG) {
                    Log.d(TAG, "Reloading, redoing updateSurfaceSize later.");
                }
                hasWallpaper = false;
            }

            // Force the wallpaper to cover the screen in both dimensions

            // 这里是给定壁纸绘制范围，原生的会去判断取当前display和壁纸数值的最大值，修改强制按照 displayInfo 适配
            // int surfaceWidth = Math.max(displayInfo.logicalWidth, mBackgroundWidth);
            // int surfaceHeight = Math.max(displayInfo.logicalHeight, mBackgroundHeight);
            int surfaceWidth = displayInfo.logicalWidth;
            int surfaceHeight = displayInfo.logicalHeight;

            // Used a fixed size surface, because we are special.  We can do
            // this because we know the current design of window animations doesn't
            // cause this to break.
            surfaceHolder.setFixedSize(surfaceWidth, surfaceHeight);
            mLastRequestedWidth = surfaceWidth;
            mLastRequestedHeight = surfaceHeight;

            return hasWallpaper;
        }

三方APP也可以通过 extends WallpaperService ，使用系统接口去绘制图片。但是需要在 设置-显示-壁纸 中去修改壁纸设置应用。修改设置壁纸应用使用 WallpaperManagerService.java -> setWallpaperComponent(ComponentName name)。*大师手机APP设置为壁纸APP之后就出问题了。