Android 截取系统界面截图：PixelCopy.request使用指南

在 Android 开发中，要使用 PixelCopy.request 方法截取当前系统界面，您可以按照以下步骤进行编写代码：\n\n1. 在 AndroidManifest.xml 文件中，为您的应用添加以下权限：\nxml\n<uses-permission android:name="android.permission.READ_FRAME_BUFFER"/>\n\n\n2. 在您的 BroadcastReceiver 中，处理接收到的广播，并调用 PixelCopy.request 方法来截取当前系统界面：\njava\nimport android.app.Activity;\nimport android.content.BroadcastReceiver;\nimport android.content.Context;\nimport android.content.Intent;\nimport android.graphics.Bitmap;\nimport android.graphics.PixelFormat;\nimport android.hardware.display.DisplayManager;\nimport android.hardware.display.VirtualDisplay;\nimport android.media.projection.MediaProjection;\nimport android.media.projection.MediaProjectionManager;\nimport android.os.Build;\nimport android.os.Environment;\nimport android.util.DisplayMetrics;\nimport android.view.Display;\nimport android.view.WindowManager;\nimport android.widget.Toast;\n\nimport androidx.annotation.RequiresApi;\nimport androidx.core.content.ContextCompat;\n\nimport java.io.File;\nimport java.io.FileOutputStream;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\nimport java.util.Locale;\n\npublic class MyBroadcastReceiver extends BroadcastReceiver {\n private static final int REQUEST_CODE_MEDIA_PROJECTION = 1;\n\n private MediaProjectionManager mMediaProjectionManager;\n private MediaProjection mMediaProjection;\n private VirtualDisplay mVirtualDisplay;\n\n private int mScreenWidth;\n private int mScreenHeight;\n private int mScreenDensity;\n\n @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)\n @Override\n public void onReceive(Context context, Intent intent) {\n // 获取 MediaProjectionManager 实例\n mMediaProjectionManager = (MediaProjectionManager) context.getSystemService(Context.MEDIA_PROJECTION_SERVICE);\n \n // 获取屏幕尺寸和密度\n WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);\n DisplayMetrics metrics = new DisplayMetrics();\n Display display = windowManager.getDefaultDisplay();\n display.getMetrics(metrics);\n mScreenWidth = metrics.widthPixels;\n mScreenHeight = metrics.heightPixels;\n mScreenDensity = metrics.densityDpi;\n \n // 获取 MediaProjection，需要用户授权\n if (mMediaProjection == null) {\n Intent permissionIntent = mMediaProjectionManager.createScreenCaptureIntent();\n // 注意：需要在 Activity 中调用 startActivityForResult 方法，并在 onActivityResult 中处理结果\n ((Activity) context).startActivityForResult(permissionIntent, REQUEST_CODE_MEDIA_PROJECTION);\n } else {\n captureScreen(context);\n }\n }\n\n @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)\n public void onActivityResult(Context context, int requestCode, int resultCode, Intent data) {\n if (requestCode == REQUEST_CODE_MEDIA_PROJECTION) {\n if (resultCode == Activity.RESULT_OK && data != null) {\n mMediaProjection = mMediaProjectionManager.getMediaProjection(resultCode, data);\n captureScreen(context);\n } else {\n Toast.makeText(context, "用户拒绝了截屏权限", Toast.LENGTH_SHORT).show();\n }\n }\n }\n\n @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)\n private void captureScreen(Context context) {\n // 创建 VirtualDisplay，用于截取屏幕内容\n mVirtualDisplay = mMediaProjection.createVirtualDisplay("ScreenCapture",\n mScreenWidth, mScreenHeight, mScreenDensity,\n DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,\n null, null, null);\n \n // 创建 bitmap，用于保存截图结果\n Bitmap bitmap = Bitmap.createBitmap(mScreenWidth, mScreenHeight, Bitmap.Config.ARGB_8888);\n \n // 使用 PixelCopy 将 VirtualDisplay 的内容复制到 bitmap 中\n PixelCopy.request(mVirtualDisplay.getSurface(), bitmap, (copyResult) -> {\n if (copyResult == PixelCopy.SUCCESS) {\n saveBitmapToFile(context, bitmap);\n } else {\n Toast.makeText(context, "截屏失败", Toast.LENGTH_SHORT).show();\n }\n \n // 释放资源\n if (mVirtualDisplay != null) {\n mVirtualDisplay.release();\n mVirtualDisplay = null;\n }\n if (mMediaProjection != null) {\n mMediaProjection.stop();\n mMediaProjection = null;\n }\n }, null);\n }\n\n private void saveBitmapToFile(Context context, Bitmap bitmap) {\n // 创建保存路径\n String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());\n String fileName = "Screenshot_" + timeStamp + ".png";\n File directory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);\n File screenshotFile = new File(directory, fileName);\n \n // 将 bitmap 保存到文件中\n try {\n FileOutputStream outputStream = new FileOutputStream(screenshotFile);\n bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);\n outputStream.flush();\n outputStream.close();\n \n Toast.makeText(context, "截屏成功，保存路径：" + screenshotFile.getAbsolutePath(), Toast.LENGTH_SHORT).show();\n } catch (Exception e) {\n Toast.makeText(context, "保存截屏失败", Toast.LENGTH_SHORT).show();\n e.printStackTrace();\n }\n }\n}\n\n\n这是一个示例代码，您需要在合适的地方调用 MyBroadcastReceiver 的 onReceive 方法来触发截屏操作，并确保在 Activity 中实现 onActivityResult 方法以处理用户授权的结果。请注意，此代码仅适用于 Android 5.0 及以上版本。\n