Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.display.VirtualDisplay android.media.projection.MediaProjection.createVirtualDisplay(java.lang.String, int, int, int, int, android.view.Surface, android.hardware.display.VirtualDisplay$Callback, android.os.Handler)' on a null object reference

时间: 2023-10-09 17:13:37 浏览: 334

这个错误是因为你在调用 `createVirtualDisplay` 方法时，`MediaProjection` 对象为空，即为 null。你需要先通过 `MediaProjectionManager` 获取到 `MediaProjection` 对象，然后再调用 `createVirtualDisplay` 方法。代码示例： // 获取 MediaProjectionManager 对象 MediaProjectionManager mediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE); // 通过 MediaProjectionManager 获取 MediaProjection 对象 MediaProjection mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data); // 创建 VirtualDisplay VirtualDisplay virtualDisplay = mediaProjection.createVirtualDisplay( "VirtualDisplay", screenWidth, screenHeight, screenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, surface, null, ```

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