Android MediaProjection录屏权限处理

 MediaProjection服务在SystemServiceRegistry的静态块里面注册的

@frameworks/base/core/java/android/app/SystemServiceRegistry.java
public final class SystemServiceRegistry {
    private static final String TAG = "SystemServiceRegistry";

    /** @hide */
    public static boolean sEnableServiceNotFoundWtf = false;

    private static int sServiceCacheSize;

    private static volatile boolean sInitializing;

    // Not instantiable.
    private SystemServiceRegistry() { }

    static {
        registerService(Context.MEDIA_PROJECTION_SERVICE, MediaProjectionManager.class,

申请屏幕录制权限通过启动com.android.systemui/.media.MediaProjectionPermissionActivity来获取权限

requestScreenRecordPermission
    Intent captureIntent = u3dClient.createScreenCaptureIntent();
        this.mProjectionManager.createScreenCaptureIntent();  
        //Intent { cmp=com.android.systemui/.media.MediaProjectionPermissionActivity } packagename=com.android.systemui
    startActivityForResult(captureIntent, LOCAL_REQUEST_CODE);

@@frameworks/base/packages/SystemUI/src/com/android/systemui/media/MediaProjectionPermissionActivity.java


/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.systemui.media;

import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.graphics.Typeface;
import android.media.projection.IMediaProjection;
import android.media.projection.IMediaProjectionManager;
import android.media.projection.MediaProjectionManager;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.text.BidiFormatter;
import android.text.Span