运行时权限分析

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//ActivityCompat
public static void requestPermissions(final @NonNull Activity activity,
        final @NonNull String[] permissions, final @IntRange(from = 0) int requestCode) {
    if (sDelegate != null
            && sDelegate.requestPermissions(activity, permissions, requestCode)) {
        // Delegate has handled the permission request.
        return;
    }
    //>=23调用activity的requestPermissions方法
    if (Build.VERSION.SDK_INT >= 23) { 
        if (activity instanceof RequestPermissionsRequestCodeValidator) {
            ((RequestPermissionsRequestCodeValidator) activity)
                    .validateRequestPermissionsRequestCode(requestCode);
        }
        activity.requestPermissions(permissions, requestCode);
    } else if (activity instanceof OnRequestPermissionsResultCallback) {
        Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
            @Override
            public void run() {
                final int[] grantResults = new int[permissions.length];

                PackageManager packageManager = activity.getPackageManager();
                String packageName = activity.getPackageName();

                final int permissionCount = permissions.length;
                for (int i = 0; i < permissionCount; i++) {
                    grantResults[i] = packageManager.checkPermission(
                            permissions[i], packageName);
                }

                ((OnRequestPermissionsResultCallback) activity).onRequestPermissionsResult(
                        requestCode, permissions, grantResults);
            }
        });
    }
}

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//Activity
public final void requestPermissions(@NonNull String[] permissions, int requestCode) {
    if (requestCode < 0) {
        throw new IllegalArgumentException("requestCode should be >= 0");
    }
    if (mHasCurrentPermissionsRequest) {
        Log.w(TAG, "Can request only one set of permissions at a time");
        // Dispatch the callback with empty arrays which means a cancellation.
        onRequestPermissionsResult(requestCode, new String[0], new int[0]);
        return;
    }
    //调用PackageManager的buildRequestPermissionsIntent方法
    Intent intent = getPackageManager().buildRequestPermissionsIntent(permissions);
    startActivityForResult(REQUEST_PERMISSIONS_WHO_PREFIX, intent, requestCode, null);
    mHasCurrentPermissionsRequest = true;
}

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@NonNull
@UnsupportedAppUsage
public Intent buildRequestPermissionsIntent(@NonNull String[] permissions) {
    if (ArrayUtils.isEmpty(permissions)) {
       throw new IllegalArgumentException("permission cannot be null or empty");
    }
    Intent intent = new Intent(ACTION_REQUEST_PERMISSIONS);
    intent.putExtra(EXTRA_REQUEST_PERMISSIONS_NAMES, permissions);
    intent.setPackage(getPermissionControllerPackageName());
    return intent;
}

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public static final String ACTION_REQUEST_PERMISSIONS =
            "android.content.pm.action.REQUEST_PERMISSIONS";

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//packages/modules/Permission/PermissionController/AndroidManifest.xml
<activity             android:name="com.android.permissioncontroller.permission.ui.GrantPermissionsActivity"
        android:configChanges="keyboardHidden|screenSize"
        android:excludeFromRecents="true"
        android:theme="@style/GrantPermissions.FilterTouches"
        android:visibleToInstantApps="true"
        android:inheritShowWhenLocked="true">
    <intent-filter android:priority="1">
        <action android:name="android.content.pm.action.REQUEST_PERMISSIONS" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

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//packages/modules/Permission/PermissionController/src/com/android/permissioncontroller/permission/ui/GrantPermissionsActivity.java